Pub Date : 2024-12-15DOI: 10.1016/j.jmst.2024.11.030
Qianhui Zhang, Yingxin Zhang, Lanzhi Ke, Haonan Jiang, Yuan Huang, Zanxiang Nie, Shunyu Jin
Hydrogel electrolytes based on natural polymers have attracted increasing attention in zinc-ion batteries (ZIBs) powering wearable and implantable electronics, but designing natural polymer hydrogels with high ionic conductivity, excellent transference performance, and inhibited Zn dendrites is still challenging. Herein, two natural biocompatible polymers (sodium alginate (SA) and agarose (AG)) are used to prepare composite hydrogel electrolytes ensuring electrostatic interaction between –COO– groups in SA and Zn2+ and coordination between C–O–C groups in AG and Zn2+. The as-obtained hydrogels exhibit an elevated ionic conductivity (25.05 mS cm−1) with a high transference number (0.75), useful for facilitated efficient Zn2+ transport. The theoretical calculations combined with experimental results reveal C–O–C groups endowing the as-prepared hydrogels with improved desolvation kinetics and capture ability of Zn2+ for achieving dendrite-free Zn deposition. In this way, the assembled Zn symmetric cell shows a long cycle life reaching 700 h at 0.2 mA cm−2. The exceptional biocompatibility of the hydrogels also results in cell viability assay with a survival rate above 93.5%. Overall, the proposed hydrogel electrolytes endow solid-state ZIBs with high discharge capacity, outstanding rate performance, long cycle life, good antifreeze capability, and impressive flexibility, useful features for future design and development of advanced ZIBs.
基于天然聚合物的水凝胶电解质在为可穿戴和植入式电子设备供电的锌离子电池（zbs）中引起了越来越多的关注，但设计具有高离子电导率、优异转移性能和抑制Zn枝晶的天然聚合物水凝胶仍然具有挑战性。本文采用海藻酸钠（SA）和琼脂糖（AG）两种天然生物相容性聚合物制备复合水凝胶电解质，保证了SA与Zn2+中- coo -基团之间的静电相互作用以及AG与Zn2+中C-O-C基团之间的配位。所得水凝胶具有较高的离子电导率（25.05 mS cm−1）和较高的转移数（0.75），有利于Zn2+的高效传输。理论计算与实验结果相结合表明，C-O-C基团使制备的水凝胶具有更好的脱溶动力学和Zn2+捕获能力，从而实现无枝晶Zn沉积。通过这种方法，组装的锌对称电池在0.2 mA cm−2下的循环寿命达到700小时。水凝胶优异的生物相容性也使其在细胞活力测定中具有93.5%以上的存活率。总体而言，所提出的水凝胶电解质赋予固态ZIBs高放电容量，出色的倍率性能，长循环寿命，良好的防冻能力和令人印象深刻的灵活性，为未来设计和开发先进的ZIBs提供了有用的特性。
{"title":"Biocompatible hydrogel electrolyte with high ionic conductivity and transference number towards dendrite-free Zn anodes","authors":"Qianhui Zhang, Yingxin Zhang, Lanzhi Ke, Haonan Jiang, Yuan Huang, Zanxiang Nie, Shunyu Jin","doi":"10.1016/j.jmst.2024.11.030","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.030","url":null,"abstract":"Hydrogel electrolytes based on natural polymers have attracted increasing attention in zinc-ion batteries (ZIBs) powering wearable and implantable electronics, but designing natural polymer hydrogels with high ionic conductivity, excellent transference performance, and inhibited Zn dendrites is still challenging. Herein, two natural biocompatible polymers (sodium alginate (SA) and agarose (AG)) are used to prepare composite hydrogel electrolytes ensuring electrostatic interaction between –COO<sup>–</sup> groups in SA and Zn<sup>2+</sup> and coordination between C–O–C groups in AG and Zn<sup>2+</sup>. The as-obtained hydrogels exhibit an elevated ionic conductivity (25.05 mS cm<sup>−1</sup>) with a high transference number (0.75), useful for facilitated efficient Zn<sup>2+</sup> transport. The theoretical calculations combined with experimental results reveal C–O–C groups endowing the as-prepared hydrogels with improved desolvation kinetics and capture ability of Zn<sup>2+</sup> for achieving dendrite-free Zn deposition. In this way, the assembled Zn symmetric cell shows a long cycle life reaching 700 h at 0.2 mA cm<sup>−2</sup>. The exceptional biocompatibility of the hydrogels also results in cell viability assay with a survival rate above 93.5%. Overall, the proposed hydrogel electrolytes endow solid-state ZIBs with high discharge capacity, outstanding rate performance, long cycle life, good antifreeze capability, and impressive flexibility, useful features for future design and development of advanced ZIBs.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"21 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142823361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-14DOI: 10.1016/j.jmst.2024.11.029
Tongtong Kou, Tong Chang, Qilin Wei, Shiguo Han, Dan Huang, Liang Wang, Zhaolai Chen, William W. Yu
Zero-dimensional (0D) metal halide perovskites with localized exciton environments have emerged as a new generation of high-efficiency luminescent materials. Introducing dopants into these luminescent materials have become a versatile way to tune photoluminescence for various optical application. Here, we report the synthesis of trivalent antimony (Sb3+) doped Cs3CdBr5 with 0D structure using the solvothermal method. Theoretical calculations indicate that the undoped Cs3CdBr5 perovskite has no emission due to the parity-forbidden transitions, whereas Sb3+-doped Cs3CdBr5 exhibits no forbidden transitions. Experimentally, Sb3+ doping significantly enhances the emission quantum yield from 0% to an impressive 94.14%. The intrinsic photophysical mechanism of the host-guest system is further elucidated by temperature-dependent photoluminescence spectra. With its excellent luminescence performance and temperature-dependent photoluminescence characteristics, Sb3+-doped Cs3CdBr5 shows potential for applications in lighting, encryption, and anti-counterfeiting. This work highlights the impact of Sb3+ ion doping on the optical properties of 0D metal halide perovskites Cs3CdBr5, enabling multi-functional applications through their enhanced luminescence properties.
{"title":"Heterovalent ion doped 0D Cs3CdBr5 with near-unity photoluminescence yield and multifunctional applications","authors":"Tongtong Kou, Tong Chang, Qilin Wei, Shiguo Han, Dan Huang, Liang Wang, Zhaolai Chen, William W. Yu","doi":"10.1016/j.jmst.2024.11.029","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.029","url":null,"abstract":"Zero-dimensional (0D) metal halide perovskites with localized exciton environments have emerged as a new generation of high-efficiency luminescent materials. Introducing dopants into these luminescent materials have become a versatile way to tune photoluminescence for various optical application. Here, we report the synthesis of trivalent antimony (Sb<sup>3+</sup>) doped Cs<sub>3</sub>CdBr<sub>5</sub> with 0D structure using the solvothermal method. Theoretical calculations indicate that the undoped Cs<sub>3</sub>CdBr<sub>5</sub> perovskite has no emission due to the parity-forbidden transitions, whereas Sb<sup>3+</sup>-doped Cs<sub>3</sub>CdBr<sub>5</sub> exhibits no forbidden transitions. Experimentally, Sb<sup>3+</sup> doping significantly enhances the emission quantum yield from 0% to an impressive 94.14%. The intrinsic photophysical mechanism of the host-guest system is further elucidated by temperature-dependent photoluminescence spectra. With its excellent luminescence performance and temperature-dependent photoluminescence characteristics, Sb<sup>3+</sup>-doped Cs<sub>3</sub>CdBr<sub>5</sub> shows potential for applications in lighting, encryption, and anti-counterfeiting. This work highlights the impact of Sb<sup>3+</sup> ion doping on the optical properties of 0D metal halide perovskites Cs<sub>3</sub>CdBr<sub>5</sub>, enabling multi-functional applications through their enhanced luminescence properties.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"22 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142820734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-14DOI: 10.1016/j.jmst.2024.11.028
Yu Fu, Huabei Peng, Hui Wang, Haoliang Wang, Jun Cheng, Yuhua Wen, Wenlong Xiao, Xinqing Zhao, Chaoli Ma
Temperature-independent modulus, i.e., the Elinvar effect, over a high and broad temperature range (119°C to 400°C) was tailored in a solution-treated metastable Ti-15Nb-5Zr-4Sn-1Fe alloy. This Elinvar effect was attained by continued growth and structure transition of the quench-induced trigonal athermal ω phase towards the high modulus thermal-induced hexagonal isothermal ω phase, compensating for the modulus softening of the β matrix due to thermal expansion during heating. Such ω phase-induced Elinvar effect can be tuned by varying heating rates to control the evolution of the ω phase and is potentially attainable in other metastable β-Ti alloys. This study showcases a new strategy for developing Elinvar Ti alloys by engineering the development of ω phase during heating.
{"title":"Engineering omega phase enables a wide temperature range Elinvar effect in metastable β-Ti alloys","authors":"Yu Fu, Huabei Peng, Hui Wang, Haoliang Wang, Jun Cheng, Yuhua Wen, Wenlong Xiao, Xinqing Zhao, Chaoli Ma","doi":"10.1016/j.jmst.2024.11.028","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.028","url":null,"abstract":"Temperature-independent modulus, i.e., the Elinvar effect, over a high and broad temperature range (119°C to 400°C) was tailored in a solution-treated metastable Ti-15Nb-5Zr-4Sn-1Fe alloy. This Elinvar effect was attained by continued growth and structure transition of the quench-induced trigonal athermal ω phase towards the high modulus thermal-induced hexagonal isothermal ω phase, compensating for the modulus softening of the β matrix due to thermal expansion during heating. Such ω phase-induced Elinvar effect can be tuned by varying heating rates to control the evolution of the ω phase and is potentially attainable in other metastable β-Ti alloys. This study showcases a new strategy for developing Elinvar Ti alloys by engineering the development of ω phase during heating.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"21 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142820766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-14DOI: 10.1016/j.jmst.2024.11.026
Min Young Sung, Tae Jin Jang, Sang Yoon Song, Gunjick Lee, KenHee Ryou, Sang-Ho Oh, Byeong-Joo Lee, Pyuck-Pa Choi, Jörg Neugebauer, Blazej Grabowski, Fritz Körmann, Yuji Ikeda, Alireza Zargaran, Seok Su Sohn
L12 precipitates are known to significantly enhance the strength and ductility of single-phase face-centered cubic (FCC) medium- or high-entropy alloys (M/HEAs). However, further improvements in mechanical properties remain untapped, as alloy design has historically focused on systems with specific CrCoNi- or FeCoCrNi-based FCC matrix and Ni3Al L12 phase compositions. This study introduces novel Co-Ni-Mo-Al alloys with L12 precipitates by systematically altering Al content, aiming to bridge this research gap by revealing the strengthening mechanisms. The (CoNi)81Mo12Al7 alloy achieves yield strength of 1086 MPa, tensile strength of 1520 MPa, and ductility of 35%, demonstrating an impressive synergy of strength, ductility, and strain-hardening capacity. Dislocation analysis via transmission electron microscopy, supported by generalized stacking fault energy (GSFE) calculations using density functional theory (DFT), demonstrates that Mo substitution for Al in the L12 phase alters dislocation behavior, promoting the formation of multiple deformation modes, including stacking faults, super-dislocation pairs, Lomer-Cottrell locks, and unusual nano-twin formation even at low strains. These behaviors are facilitated by the low stacking fault energy (SFE) of the FCC matrix, overlapping of SFs, and dislocation dissociation across anti-phase boundaries (APBs). The increased energy barrier for superlattice intrinsic stacking fault (SISF) formation compared to APBs, due to Mo substitution, further influences dislocation activity. This work demonstrates a novel strategy for designing high-performance M/HEAs by expanding the range of FCC matrix and L12 compositions through precipitation hardening.
{"title":"Ultrastrong and ductile CoNiMoAl medium-entropy alloys enabled by L12 nanoprecipitate-induced multiple deformation mechanisms","authors":"Min Young Sung, Tae Jin Jang, Sang Yoon Song, Gunjick Lee, KenHee Ryou, Sang-Ho Oh, Byeong-Joo Lee, Pyuck-Pa Choi, Jörg Neugebauer, Blazej Grabowski, Fritz Körmann, Yuji Ikeda, Alireza Zargaran, Seok Su Sohn","doi":"10.1016/j.jmst.2024.11.026","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.026","url":null,"abstract":"L1<sub>2</sub> precipitates are known to significantly enhance the strength and ductility of single-phase face-centered cubic (FCC) medium- or high-entropy alloys (M/HEAs). However, further improvements in mechanical properties remain untapped, as alloy design has historically focused on systems with specific CrCoNi- or FeCoCrNi-based FCC matrix and Ni<sub>3</sub>Al L1<sub>2</sub> phase compositions. This study introduces novel Co-Ni-Mo-Al alloys with L1<sub>2</sub> precipitates by systematically altering Al content, aiming to bridge this research gap by revealing the strengthening mechanisms. The (CoNi)<sub>81</sub>Mo<sub>12</sub>Al<sub>7</sub> alloy achieves yield strength of 1086 MPa, tensile strength of 1520 MPa, and ductility of 35%, demonstrating an impressive synergy of strength, ductility, and strain-hardening capacity. Dislocation analysis via transmission electron microscopy, supported by generalized stacking fault energy (GSFE) calculations using density functional theory (DFT), demonstrates that Mo substitution for Al in the L1<sub>2</sub> phase alters dislocation behavior, promoting the formation of multiple deformation modes, including stacking faults, super-dislocation pairs, Lomer-Cottrell locks, and unusual nano-twin formation even at low strains. These behaviors are facilitated by the low stacking fault energy (SFE) of the FCC matrix, overlapping of SFs, and dislocation dissociation across anti-phase boundaries (APBs). The increased energy barrier for superlattice intrinsic stacking fault (SISF) formation compared to APBs, due to Mo substitution, further influences dislocation activity. This work demonstrates a novel strategy for designing high-performance M/HEAs by expanding the range of FCC matrix and L1<sub>2</sub> compositions through precipitation hardening.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"248 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142820989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-13DOI: 10.1016/j.jmst.2024.11.027
Yuanfei Su, Shuzhan Zhang, Shengxuan Jiao, Xianbo Shi, Wei Yan, Lijian Rong
High-temperature long-term microstructural instability is an urgent problem to be solved for high-silicon Fe-Cr-Ni austenitic stainless steel. In this study, we propose a novel strategy to improve the microstructural thermal stability of Si-modified Fe-Cr-Ni austenitic steels via N doping. The microstructural evolution behaviors of N-free and N-doping steels were systematically investigated during aging at 783–923 K. The findings indicate that N doping results in substantial grain refinement and improves the strength of the steel. Importantly, it is found that N doping inhibits the premature segregation of Ni, Cr, Si, and Mo at grain boundaries by reducing their diffusion coefficients, thereby suppressing the generation of intergranular M6C carbides during aging at 783 K, achieving superior thermal stability. In contrast, N-free steel exhibits microstructural instability due to the γ → M6C + ferrite transformation during aging at 783 K. At 823 and 873 K, it is concluded that the diffusion of alloying elements accelerates, resulting in the formation of M6C and ferrite in N-doping steel and subsequent microstructural instability. It contributes to a decrease in impact toughness, as microcracks tend to form at the ferrite domain and M6C/ferrite interface with high strain concentration. Notably, when aged at 923 K, N-doping steel exhibits a cellular structure composed of M23C6 and M6C carbonitrides, with Nb(C, N) serving as the nucleation site within the grains. This differs from the intragranular χ-phase observed in N-free steel, as the nucleation driving force of the χ-phase decreases with an increasing N content. The study offers valuable insights for the development of fastener materials intended for utilization in lead-cooled fast reactors.
{"title":"Nitrogen enhances microstructural thermal stability of Si-modified Fe-Cr-Ni austenitic stainless steel","authors":"Yuanfei Su, Shuzhan Zhang, Shengxuan Jiao, Xianbo Shi, Wei Yan, Lijian Rong","doi":"10.1016/j.jmst.2024.11.027","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.027","url":null,"abstract":"High-temperature long-term microstructural instability is an urgent problem to be solved for high-silicon Fe-Cr-Ni austenitic stainless steel. In this study, we propose a novel strategy to improve the microstructural thermal stability of Si-modified Fe-Cr-Ni austenitic steels via N doping. The microstructural evolution behaviors of N-free and N-doping steels were systematically investigated during aging at 783–923 K. The findings indicate that N doping results in substantial grain refinement and improves the strength of the steel. Importantly, it is found that N doping inhibits the premature segregation of Ni, Cr, Si, and Mo at grain boundaries by reducing their diffusion coefficients, thereby suppressing the generation of intergranular M<sub>6</sub>C carbides during aging at 783 K, achieving superior thermal stability. In contrast, N-free steel exhibits microstructural instability due to the γ → M<sub>6</sub>C + ferrite transformation during aging at 783 K. At 823 and 873 K, it is concluded that the diffusion of alloying elements accelerates, resulting in the formation of M<sub>6</sub>C and ferrite in N-doping steel and subsequent microstructural instability. It contributes to a decrease in impact toughness, as microcracks tend to form at the ferrite domain and M<sub>6</sub>C/ferrite interface with high strain concentration. Notably, when aged at 923 K, N-doping steel exhibits a cellular structure composed of M<sub>23</sub>C<sub>6</sub> and M<sub>6</sub>C carbonitrides, with Nb(C, N) serving as the nucleation site within the grains. This differs from the intragranular χ-phase observed in N-free steel, as the nucleation driving force of the χ-phase decreases with an increasing N content. The study offers valuable insights for the development of fastener materials intended for utilization in lead-cooled fast reactors.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"1 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142815932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The liquid metal embrittlement (LME) of advanced high-strength steels caused by zinc (Zn) has become a critical issue hindering their widespread application in the automotive industry. In this study, atomic-scale simulations are carried out to elucidate the underlying cause of this phenomenon, namely grain boundary embrittlement due to Zn segregation at iron (Fe) grain boundaries. A machine learning moment tensor interatomic potential for the Fe-Zn binary system is developed, based on which the thermodynamics of grain boundary segregation is evaluated. The yielded segregation energy spectrum of Zn in BCC Fe reveals the quantitative relationship between the average segregation concentration of Zn at Fe grain boundaries and the macroscopic Zn content, temperature, and fraction of grain boundary atoms. It suggests a strong thermodynamic driving force for Zn segregation at the Fe grain boundaries, which correlates directly with the grain boundary energy: high-energy grain boundaries can accommodate a large amount of Zn atoms, while low-energy grain boundaries exhibit a certain degree of repulsion to Zn. Kinetically, Zn enters the grain boundaries more easily through diffusion than by penetration. Nonetheless, the grain boundary embrittlement caused by Zn penetration is more severe than that by Zn diffusion. The embrittlement effect generally increases linearly with the increase in Zn concentration at the grain boundary. Altogether, it suggests that the LME in steels induced by grain boundary segregation of Zn emerges as a combined consequence of Zn melt penetration and solid-state diffusion of Zn atoms.
{"title":"Zn segregation in BCC Fe grain boundaries and its role in liquid metal embrittlement revealed by atomistic simulations","authors":"Haojie Mei, Luyao Cheng, Liang Chen, Feifei Wang, Guiqin Yang, Jinfu Li, Lingti Kong","doi":"10.1016/j.jmst.2024.10.052","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.052","url":null,"abstract":"The liquid metal embrittlement (LME) of advanced high-strength steels caused by zinc (Zn) has become a critical issue hindering their widespread application in the automotive industry. In this study, atomic-scale simulations are carried out to elucidate the underlying cause of this phenomenon, namely grain boundary embrittlement due to Zn segregation at iron (Fe) grain boundaries. A machine learning moment tensor interatomic potential for the Fe-Zn binary system is developed, based on which the thermodynamics of grain boundary segregation is evaluated. The yielded segregation energy spectrum of Zn in BCC Fe reveals the quantitative relationship between the average segregation concentration of Zn at Fe grain boundaries and the macroscopic Zn content, temperature, and fraction of grain boundary atoms. It suggests a strong thermodynamic driving force for Zn segregation at the Fe grain boundaries, which correlates directly with the grain boundary energy: high-energy grain boundaries can accommodate a large amount of Zn atoms, while low-energy grain boundaries exhibit a certain degree of repulsion to Zn. Kinetically, Zn enters the grain boundaries more easily through diffusion than by penetration. Nonetheless, the grain boundary embrittlement caused by Zn penetration is more severe than that by Zn diffusion. The embrittlement effect generally increases linearly with the increase in Zn concentration at the grain boundary. Altogether, it suggests that the LME in steels induced by grain boundary segregation of Zn emerges as a combined consequence of Zn melt penetration and solid-state diffusion of Zn atoms.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"29 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142815933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-13DOI: 10.1016/j.jmst.2024.11.025
Silu Peng, Chaoyi Zhang, Yuchao Wei, Yi Ouyang, Jiayue Han, Chunyu Li, Mingdong Dong, Jun Wang
PbSe materials, with their narrow bandgap, excellent optical absorption and outstanding optical response, are ideal for infrared photodetectors, exhibiting unique advantages in optical communication, infrared imaging and thermal detection. Nevertheless, PbSe typically has a non-layered crystal structure and inherent isotropy, making the synthesis of low-dimensional nanomaterials challenging. Besides, PbSe photoconductive detectors suffer from high dark current due to intrinsic defects and thermally excited carriers, which is detrimental to device performance. Here, we utilized physical vapor deposition (PVD) method to grow high-quality PbSe nanosheets and combined them with two-dimensional (2D) transition metal dichalcogenides (TMDs) material WSe2 to fabricate a self-powered PbSe/WSe2 p-n heterostructure photodetector. Under illumination with a 650 nm laser at a power density of 128.97 mW/cm2 and 0 V bias, the PbSe/WSe2 heterojunction device exhibited significant photovoltaic characteristics and generated a short-circuit current of 161.7 nA. Furthermore, under 0.02 mW/cm2 of 650 nm laser illumination at 0 V bias, the device achieved an excellent responsivity (R) of 15.6 A/W and a specific detectivity (D*) of 1.08×1011 Jones. And the response speed of the heterojunction device at 0 V (511 μs/74 μs) was three orders of magnitude faster than that of PbSe nanosheets (93 ms/104 ms). The device also demonstrated broadband detection capabilities from 405 nm to 1550 nm and excellent imaging performance in the near-infrared region at 0 V bias. In summary, the outstanding photoelectric detection performance and imaging capabilities of the PbSe/WSe2 heterojunction nanosheet detector indicate its significant potential for applications in miniaturized, low-noise, broadband, high-speed and high-performance photodetectors.
{"title":"High performance self-powered PbSe/WSe2 p-n heterojunction photodetector for image sensing","authors":"Silu Peng, Chaoyi Zhang, Yuchao Wei, Yi Ouyang, Jiayue Han, Chunyu Li, Mingdong Dong, Jun Wang","doi":"10.1016/j.jmst.2024.11.025","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.025","url":null,"abstract":"PbSe materials, with their narrow bandgap, excellent optical absorption and outstanding optical response, are ideal for infrared photodetectors, exhibiting unique advantages in optical communication, infrared imaging and thermal detection. Nevertheless, PbSe typically has a non-layered crystal structure and inherent isotropy, making the synthesis of low-dimensional nanomaterials challenging. Besides, PbSe photoconductive detectors suffer from high dark current due to intrinsic defects and thermally excited carriers, which is detrimental to device performance. Here, we utilized physical vapor deposition (PVD) method to grow high-quality PbSe nanosheets and combined them with two-dimensional (2D) transition metal dichalcogenides (TMDs) material WSe<sub>2</sub> to fabricate a self-powered PbSe/WSe<sub>2</sub> p-n heterostructure photodetector. Under illumination with a 650 nm laser at a power density of 128.97 mW/cm<sup>2</sup> and 0 V bias, the PbSe/WSe<sub>2</sub> heterojunction device exhibited significant photovoltaic characteristics and generated a short-circuit current of 161.7 nA. Furthermore, under 0.02 mW/cm<sup>2</sup> of 650 nm laser illumination at 0 V bias, the device achieved an excellent responsivity (<em>R</em>) of 15.6 A/W and a specific detectivity (<em>D*</em>) of 1.08×10<sup>11</sup> Jones. And the response speed of the heterojunction device at 0 V (511 μs/74 μs) was three orders of magnitude faster than that of PbSe nanosheets (93 ms/104 ms). The device also demonstrated broadband detection capabilities from 405 nm to 1550 nm and excellent imaging performance in the near-infrared region at 0 V bias. In summary, the outstanding photoelectric detection performance and imaging capabilities of the PbSe/WSe<sub>2</sub> heterojunction nanosheet detector indicate its significant potential for applications in miniaturized, low-noise, broadband, high-speed and high-performance photodetectors.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"2018 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142815930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-13DOI: 10.1016/j.jmst.2024.12.003
Kai Du, Jianhua Cui, Yong Hou, Yanqiang Ren, Jiaqing You, Liang Ying, Xiaoqiang Li, Xiaojiao Zuo, Hongjun Huang, Xiaoguang Yuan
The automotive industry increasingly relies on numerical simulations to predict the geometry and forming processes of complex curved parts. Accurate yield stress functions that cover a wide range of stress states, such as uniaxial tension, equi-biaxial tension, near-plane strain tension, and simple shear, are essential for implementing virtual manufacturing technologies. In this work, a new additive-coupled analytical yield stress function, CPN2025, is proposed to accurately describe plastic anisotropy under various loading conditions. CPN2025 integrates the Poly4 anisotropic yield criterion with the Hosford isotropic yield criterion under a non-associated flow rule. A non-fixed-exponent calibration strategy is introduced, overcoming the limitations of existing yield criteria that typically offer curvature adjustment with only positive or negative correlations. CPN2025 is compared with other non-associated yield functions, including SY2009, CQN2017, and NAFR-Poly4, to evaluate its performance in predicting the plastic anisotropy of DP490, QP1180, AA5754-O, and AA6016-T4. Results show that, while meeting convexity requirements, the additive-coupled approach not only provides greater flexibility than the multiplicative-coupled but also simplifies the acquisition of partial derivative information. CPN2025 delivers the highest accuracy in characterizing anisotropic yield behavior, particularly for near-plane strain tension and simple shear loadings. Additionally, incorporating more uniaxial tensile yield stress-calibrated material parameters significantly improves the prediction capacity of in-plane anisotropic behavior. The use of anisotropic hardening concepts enhances the model's capability to capture the subsequent yield behavior across the entire plastic strain range.
{"title":"Breaking through the plasticity modeling limit in plane strain and shear loadings of sheet metals by a novel additive-coupled analytical yield criterion","authors":"Kai Du, Jianhua Cui, Yong Hou, Yanqiang Ren, Jiaqing You, Liang Ying, Xiaoqiang Li, Xiaojiao Zuo, Hongjun Huang, Xiaoguang Yuan","doi":"10.1016/j.jmst.2024.12.003","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.12.003","url":null,"abstract":"The automotive industry increasingly relies on numerical simulations to predict the geometry and forming processes of complex curved parts. Accurate yield stress functions that cover a wide range of stress states, such as uniaxial tension, equi-biaxial tension, near-plane strain tension, and simple shear, are essential for implementing virtual manufacturing technologies. In this work, a new additive-coupled analytical yield stress function, CPN2025, is proposed to accurately describe plastic anisotropy under various loading conditions. CPN2025 integrates the Poly4 anisotropic yield criterion with the Hosford isotropic yield criterion under a non-associated flow rule. A non-fixed-exponent calibration strategy is introduced, overcoming the limitations of existing yield criteria that typically offer curvature adjustment with only positive or negative correlations. CPN2025 is compared with other non-associated yield functions, including SY2009, CQN2017, and NAFR-Poly4, to evaluate its performance in predicting the plastic anisotropy of DP490, QP1180, AA5754-O, and AA6016-T4. Results show that, while meeting convexity requirements, the additive-coupled approach not only provides greater flexibility than the multiplicative-coupled but also simplifies the acquisition of partial derivative information. CPN2025 delivers the highest accuracy in characterizing anisotropic yield behavior, particularly for near-plane strain tension and simple shear loadings. Additionally, incorporating more uniaxial tensile yield stress-calibrated material parameters significantly improves the prediction capacity of in-plane anisotropic behavior. The use of anisotropic hardening concepts enhances the model's capability to capture the subsequent yield behavior across the entire plastic strain range.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"8 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142815929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-13DOI: 10.1016/j.jmst.2024.10.051
Minqian Liu, Li Hu, Xinran Kang, Yankun Zhang, Xue Liu, Lianyong Xu, Yongdian Han
To fully utilize the functionality of shape memory alloys (SMAs), laser powder bed fusion (LPBF) has gradually become the most dominant preparation method for NiTi SMAs owing to its high geometric adaptability. However, due to the unique microstructure of LPBF parts, the shape memory effect (SME) of SMAs prepared by this method is significantly lower than that of other preparation processes. Improving SME has become a recognized difficult problem. This study investigates that dislocation slip and stable martensite during deformation are the main causes of irreversible strain. Furthermore, for the first time, it was found that the hindering effect of nanoprecipitates relative to dislocation movement in LPBF NiTi SMAs can inhibit the formation of slip bands. This hinders the formation of stable martensite and significantly improves SME (with a maximum tensile strength of 922 MPa, maximum elongation of 10.18%, and recoverable strain of 6.8% after applying 8% strain). These results provide a theoretical basis for enhancing the SME of LPBF-SMAs and offer the possibility for preparing NiTi SMAs smart actuators.
为了充分发挥形状记忆合金（SMAs）的功能，激光粉末床熔合（LPBF）因其高度的几何适应性逐渐成为NiTi形状记忆合金最主要的制备方法。然而，由于LPBF零件的独特微观结构，该方法制备的sma的形状记忆效应（SME）明显低于其他制备工艺。发展中小企业已成为公认的难题。研究了变形过程中的位错滑移和稳定马氏体是产生不可逆应变的主要原因。此外，首次发现纳米沉淀物相对于LPBF NiTi sma中位错运动的阻碍作用可以抑制滑移带的形成。这阻碍了稳定马氏体的形成，显著提高了SME（最大抗拉强度为922 MPa，最大伸长率为10.18%，施加8%应变后的可恢复应变为6.8%）。这些结果为提高LPBF-SMAs的SME提供了理论基础，并为制备NiTi SMAs智能执行器提供了可能。
{"title":"Deformation mechanism of defect-free Ni50Ti50 alloys via laser powder bed fusion","authors":"Minqian Liu, Li Hu, Xinran Kang, Yankun Zhang, Xue Liu, Lianyong Xu, Yongdian Han","doi":"10.1016/j.jmst.2024.10.051","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.10.051","url":null,"abstract":"To fully utilize the functionality of shape memory alloys (SMAs), laser powder bed fusion (LPBF) has gradually become the most dominant preparation method for NiTi SMAs owing to its high geometric adaptability. However, due to the unique microstructure of LPBF parts, the shape memory effect (SME) of SMAs prepared by this method is significantly lower than that of other preparation processes. Improving SME has become a recognized difficult problem. This study investigates that dislocation slip and stable martensite during deformation are the main causes of irreversible strain. Furthermore, for the first time, it was found that the hindering effect of nanoprecipitates relative to dislocation movement in LPBF NiTi SMAs can inhibit the formation of slip bands. This hinders the formation of stable martensite and significantly improves SME (with a maximum tensile strength of 922 MPa, maximum elongation of 10.18%, and recoverable strain of 6.8% after applying 8% strain). These results provide a theoretical basis for enhancing the SME of LPBF-SMAs and offer the possibility for preparing NiTi SMAs smart actuators.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"233 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142815931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-12DOI: 10.1016/j.jmst.2024.11.023
Ting Sai, Xiaodi Ye, Bingtao Wang, Zhenghong Guo, Juan Li, Zhengping Fang, Siqi Huo
A series of transparent, intrinsically flame-retardant, and impact-resistant poly(carbonates-b-siloxanes) were synthesized by incorporating Schiff-base modified polysiloxanes (DMS-Schiff) and naphthalene-sulfonate units into the polycarbonate (PC) chain. In addition to high transparency, the resultant copolymers (SS-co-PC5, SS-co-PC9, SS-co-PC14, and SS-co-PC20) exhibited remarkable improvements in fire safety and mechanical performance. Compared to pure PC, these copolymers demonstrated significantly enhanced limiting oxygen index (LOI, up to 34.5%) and a UL-94 V-0 rating under a thickness of only 1.6 mm. The incorporation of the polysiloxane blocks not only improved flame retardancy but also enhanced the impact strength, with SS-co-PC9 showing a 48% increase in elongation at break and a 38% rise in impact toughness compared to pure PC. In addition, SS-co-PC9 presented high mechanical strength. The synergistic effects between the naphthalene-sulfonate and polysiloxane blocks, along with the well-controlled polysiloxane phase separation (sulfonate units enabled lower processing viscosity of copolymers), led to superior comprehensive performance. These findings provide a promising pathway to create high-performance copolycarbonates for real-world applications.
通过在聚碳酸酯（PC）链中加入席夫碱修饰的聚硅氧烷（DMS-Schiff）和萘磺酸单元，合成了一系列透明、本征阻燃和抗冲击的聚（碳酸盐-b-硅氧烷）。除了高透明度之外，这些共聚物（SS-co-PC5、SS-co-PC9、SS-co-PC14 和 SS-co-PC20）在防火安全性和机械性能方面也有显著改善。与纯 PC 相比，这些共聚物的极限氧指数（LOI，高达 34.5%）显著提高，在厚度仅为 1.6 毫米的情况下，达到了 UL-94 V-0 等级。与纯 PC 相比，SS-co-PC9 的断裂伸长率提高了 48%，冲击韧性提高了 38%。此外，SS-co-PC9 还具有很高的机械强度。萘磺酸盐和聚硅氧烷嵌段之间的协同效应，以及良好控制的聚硅氧烷相分离（磺酸盐单元可降低共聚物的加工粘度），使得共聚物具有卓越的综合性能。这些发现为制造高性能共聚碳酸酯的实际应用提供了一条前景广阔的途径。
{"title":"Transparent, intrinsically fire-safe yet impact-resistant poly(carbonates-b-siloxanes) containing Schiff-base and naphthalene-sulfonate","authors":"Ting Sai, Xiaodi Ye, Bingtao Wang, Zhenghong Guo, Juan Li, Zhengping Fang, Siqi Huo","doi":"10.1016/j.jmst.2024.11.023","DOIUrl":"https://doi.org/10.1016/j.jmst.2024.11.023","url":null,"abstract":"A series of transparent, intrinsically flame-retardant, and impact-resistant poly(carbonates-<em>b</em>-siloxanes) were synthesized by incorporating Schiff-base modified polysiloxanes (DMS-Schiff) and naphthalene-sulfonate units into the polycarbonate (PC) chain. In addition to high transparency, the resultant copolymers (SS-co-PC5, SS-co-PC9, SS-co-PC14, and SS-co-PC20) exhibited remarkable improvements in fire safety and mechanical performance. Compared to pure PC, these copolymers demonstrated significantly enhanced limiting oxygen index (LOI, up to 34.5%) and a UL-94 V-0 rating under a thickness of only 1.6 mm. The incorporation of the polysiloxane blocks not only improved flame retardancy but also enhanced the impact strength, with SS-co-PC9 showing a 48% increase in elongation at break and a 38% rise in impact toughness compared to pure PC. In addition, SS-co-PC9 presented high mechanical strength. The synergistic effects between the naphthalene-sulfonate and polysiloxane blocks, along with the well-controlled polysiloxane phase separation (sulfonate units enabled lower processing viscosity of copolymers), led to superior comprehensive performance. These findings provide a promising pathway to create high-performance copolycarbonates for real-world applications.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"93 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142815934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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