Pub Date : 2025-04-01DOI: 10.1016/j.scriptamat.2025.116671
Y.Y. Hu , X.T. Wang , Y.J. Ma , J.L. Chen , X.J. Zhao , J. Cheng , T.R. Xu , W.L. Zhao , X.Y. Song , S. Wu , Z.H. Cao
Atomic size misfit is one of the origins of solid-solution strengthening in alloys. In this study, we reported a strong solid-solution strengthening via tuning the atomic size misfit in the single-phase body-centered cubic TiZrVNb-based refractory high-entropy alloys (HEAs). The results suggest that the yield strength of the cast samples significantly increased from 680 MPa to 998 MPa with increasing the largest atomic radius Zr content. Among them, the Ti35Zr15V25Nb25 HEA exhibits the best combination of high yield strength of 918 MPa and ductility of 16 %. The solid-solution strengthening causes the 318 MPa strength increment as the atomic size misfit increases from 3.43 % to 4.95 %, where the contribution of atomic size misfit reaches 77 %. Strong solid-solution strengthening mainly originates from the enhanced lattice distortion acting as a strong barrier to dislocation motion, where the resultant high-density dislocations and the activated multiple slip systems lead to the outstanding strain-hardening capacity of the HEAs.
{"title":"Strong solid solution strengthening caused by severe lattice distortion in body-centered cubic refractory high-entropy alloys","authors":"Y.Y. Hu , X.T. Wang , Y.J. Ma , J.L. Chen , X.J. Zhao , J. Cheng , T.R. Xu , W.L. Zhao , X.Y. Song , S. Wu , Z.H. Cao","doi":"10.1016/j.scriptamat.2025.116671","DOIUrl":"10.1016/j.scriptamat.2025.116671","url":null,"abstract":"<div><div>Atomic size misfit is one of the origins of solid-solution strengthening in alloys. In this study, we reported a strong solid-solution strengthening via tuning the atomic size misfit in the single-phase body-centered cubic TiZrVNb-based refractory high-entropy alloys (HEAs). The results suggest that the yield strength of the cast samples significantly increased from 680 MPa to 998 MPa with increasing the largest atomic radius Zr content. Among them, the Ti<sub>35</sub>Zr<sub>15</sub>V<sub>25</sub>Nb<sub>25</sub> HEA exhibits the best combination of high yield strength of 918 MPa and ductility of 16 %. The solid-solution strengthening causes the 318 MPa strength increment as the atomic size misfit increases from 3.43 % to 4.95 %, where the contribution of atomic size misfit reaches 77 %. Strong solid-solution strengthening mainly originates from the enhanced lattice distortion acting as a strong barrier to dislocation motion, where the resultant high-density dislocations and the activated multiple slip systems lead to the outstanding strain-hardening capacity of the HEAs.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"263 ","pages":"Article 116671"},"PeriodicalIF":5.3,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-30DOI: 10.1016/j.scriptamat.2025.116670
Jin Zhang , Zhigang Jiang , Jingchao Xu , Jipeng Duan , Haoyue Wang , Yuanhuai He , Wen Zhang , Peng Cao
Amorphous Si (a-Si) exhibits significant advantages as an anode material for lithium-ion batteries due to its excellent tolerance to intrinsic strain/stress and superior charge transfer kinetics. However, the successful implementation of a-Si requires scalable synthesis and rational design. In this study, we have successfully synthesized a self-supporting three-dimensional (3D) porous a-Si anode (3DporCu@a-Si@CNTs) using a simple process that avoids dangerous reagents or expensive equipment. The outstanding performance of the anode is attributed to its binder-free 3D porous structure, amorphous nature, and artificial surface modification. After 150 cycles at 0.1C, the 3DporCu@a-Si@CNTs anode delivers a high capacity of 2674 mAh g-1 while maintaining the 3D porous structure. Furthermore, it demonstrates a remarkable rate capability of 2281 mAh g-1 at 10C. The simplified synthesis process and the performance advantages highlight the potential of this anode in lithium-ion battery applications.
{"title":"Self-supporting porous amorphous silicon anode for high-performance lithium-ion batteries","authors":"Jin Zhang , Zhigang Jiang , Jingchao Xu , Jipeng Duan , Haoyue Wang , Yuanhuai He , Wen Zhang , Peng Cao","doi":"10.1016/j.scriptamat.2025.116670","DOIUrl":"10.1016/j.scriptamat.2025.116670","url":null,"abstract":"<div><div>Amorphous Si (a-Si) exhibits significant advantages as an anode material for lithium-ion batteries due to its excellent tolerance to intrinsic strain/stress and superior charge transfer kinetics. However, the successful implementation of a-Si requires scalable synthesis and rational design. In this study, we have successfully synthesized a self-supporting three-dimensional (3D) porous a-Si anode (3DporCu@a-Si@CNTs) using a simple process that avoids dangerous reagents or expensive equipment. The outstanding performance of the anode is attributed to its binder-free 3D porous structure, amorphous nature, and artificial surface modification. After 150 cycles at 0.1C, the 3DporCu@a-Si@CNTs anode delivers a high capacity of 2674 mAh g<sup>-1</sup> while maintaining the 3D porous structure. Furthermore, it demonstrates a remarkable rate capability of 2281 mAh g<sup>-1</sup> at 10C. The simplified synthesis process and the performance advantages highlight the potential of this anode in lithium-ion battery applications.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"263 ","pages":"Article 116670"},"PeriodicalIF":5.3,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-29DOI: 10.1016/j.scriptamat.2025.116665
Anwesha Kanjilal , Shamsa Aliramaji , Deborah Neuß , Marcus Hans , Jochen M. Schneider , James P. Best , Gerhard Dehm
While hetero-interfaces in materials are critical for tuning mechanical properties, they can also act as failure sites, underscoring the importance of determining their strength. This study reports on a novel single-shear micro-geometry, and demonstrates its applicability for testing the strength and deformation of hetero-interface in bi-layered films in a direct manner. The shear tests are applied to a model CaMg2-Mg bi-layered system grown by magnetron sputtering, comprising of a CaMg2 film deposited onto a Mg layer. A parametric study was performed using finite element modeling to optimize the specimen dimensions. Subsequently, in situ microshear tests conducted inside a scanning electron microscope revealed interface shear strength of ∼129 12 MPa, and provided insights into the stages of deformation progression from elastic behavior to interface sliding, accompanied by plasticity in Mg near the interface. Post mortem examination of the sheared interface revealed irregular surface indicating ductile deformation at room temperature.
{"title":"Microscale deformation of an intermetallic-metal interface in bi-layered film under shear loading","authors":"Anwesha Kanjilal , Shamsa Aliramaji , Deborah Neuß , Marcus Hans , Jochen M. Schneider , James P. Best , Gerhard Dehm","doi":"10.1016/j.scriptamat.2025.116665","DOIUrl":"10.1016/j.scriptamat.2025.116665","url":null,"abstract":"<div><div>While hetero-interfaces in materials are critical for tuning mechanical properties, they can also act as failure sites, underscoring the importance of determining their strength. This study reports on a novel single-shear micro-geometry, and demonstrates its applicability for testing the strength and deformation of hetero-interface in bi-layered films in a direct manner. The shear tests are applied to a model CaMg<sub>2</sub>-Mg bi-layered system grown by magnetron sputtering, comprising of a CaMg<sub>2</sub> film deposited onto a Mg layer. A parametric study was performed using finite element modeling to optimize the specimen dimensions. Subsequently, <em>in situ</em> microshear tests conducted inside a scanning electron microscope revealed interface shear strength of ∼129 <span><math><mo>±</mo></math></span> 12 MPa, and provided insights into the stages of deformation progression from elastic behavior to interface sliding, accompanied by plasticity in Mg near the interface. <em>Post mortem</em> examination of the sheared interface revealed irregular surface indicating ductile deformation at room temperature.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"263 ","pages":"Article 116665"},"PeriodicalIF":5.3,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-28DOI: 10.1016/j.scriptamat.2025.116664
Tristan Kammbach , Elisa Cantergiani , Tillmann R. Neu , Paul H. Kamm , Jonathan Friedli , Zeqin Liang , Francisco García-Moreno
Sustainable aluminum production for the automotive industry with a high content of recycled material offers considerable potential for CO2 footprint reduction and cost savings. A three-dimensional characterization of cast AA6016 alloys with <50 wt% and >75 wt% of recycled aluminum was carried out to assess the volume fraction, total number and surface area of intermetallics and casting voids using high-resolution synchrotron X-ray tomography. A new data analysis method is presented to describe morphology of intermetallics based on a surface area/volume by volume plot, which allows for better classification of their different geometry clusters even for small modifications of Fe and Mn in the cast alloy.
{"title":"X-ray tomography analysis of intermetallics and voids in 6XXX alloys","authors":"Tristan Kammbach , Elisa Cantergiani , Tillmann R. Neu , Paul H. Kamm , Jonathan Friedli , Zeqin Liang , Francisco García-Moreno","doi":"10.1016/j.scriptamat.2025.116664","DOIUrl":"10.1016/j.scriptamat.2025.116664","url":null,"abstract":"<div><div>Sustainable aluminum production for the automotive industry with a high content of recycled material offers considerable potential for CO<sub>2</sub> footprint reduction and cost savings. A three-dimensional characterization of cast AA6016 alloys with <50 wt% and >75 wt% of recycled aluminum was carried out to assess the volume fraction, total number and surface area of intermetallics and casting voids using high-resolution synchrotron X-ray tomography. A new data analysis method is presented to describe morphology of intermetallics based on a surface area/volume by volume plot, which allows for better classification of their different geometry clusters even for small modifications of Fe and Mn in the cast alloy.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"263 ","pages":"Article 116664"},"PeriodicalIF":5.3,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-03-27DOI: 10.1016/j.scriptamat.2025.116667
Zhao-Yuan Meng , X.Y. Xu , Shen-Bao Jin , Yu-Long Zhu , Peng Chen , Hui-Yuan Wang
In this work, we report a heterogeneous nucleation-driven precipitation in a low-alloyed magnesium (Mg) alloy, in which tri-atomic-layer η' phases serve as nucleation sites for Al-Mn-(Ca) precipitates. After peak aging, the alloy exhibits a high density of nanoscale Al-Mn-Ca phases (∼2.5 × 1023 m−3), resulting in a substantial age-hardening response of ∼61 MPa, with no decline observed even after prolonged over-aging for up to 300 h. Atomic-resolution HAADF-STEM and APT analyses reveal a three-stage phase evolution: (I) initial η' phase formation, (II) heterogeneous nucleation of Al-Mn clusters on η' phases, and (III) transformation of Al-Mn clusters into Al-Mn-Ca phases, accompanied by partial η' phase dissolution. Molecular dynamics simulations further identify non-equilibrium stress sites around the tri-atomic-layer Al-Ca η' phases, driving the preferential aggregation of Al-Mn clusters. This work presents a new strategy for precipitate inoculation in solid-state precipitation, offering pathways to enhance precipitate density in Mg alloys.
{"title":"Heterogeneous nucleation-driven precipitation of densely distributed nanoscale phases in a low-alloyed magnesium alloy","authors":"Zhao-Yuan Meng , X.Y. Xu , Shen-Bao Jin , Yu-Long Zhu , Peng Chen , Hui-Yuan Wang","doi":"10.1016/j.scriptamat.2025.116667","DOIUrl":"10.1016/j.scriptamat.2025.116667","url":null,"abstract":"<div><div>In this work, we report a heterogeneous nucleation-driven precipitation in a low-alloyed magnesium (Mg) alloy, in which tri-atomic-layer η' phases serve as nucleation sites for Al-Mn-(Ca) precipitates. After peak aging, the alloy exhibits a high density of nanoscale Al-Mn-Ca phases (∼2.5 × 10<sup>23</sup> m<sup>−3</sup>), resulting in a substantial age-hardening response of ∼61 MPa, with no decline observed even after prolonged over-aging for up to 300 h. Atomic-resolution HAADF-STEM and APT analyses reveal a three-stage phase evolution: (I) initial η' phase formation, (II) heterogeneous nucleation of Al-Mn clusters on η' phases, and (III) transformation of Al-Mn clusters into Al-Mn-Ca phases, accompanied by partial η' phase dissolution. Molecular dynamics simulations further identify non-equilibrium stress sites around the tri-atomic-layer Al-Ca η' phases, driving the preferential aggregation of Al-Mn clusters. This work presents a new strategy for precipitate inoculation in solid-state precipitation, offering pathways to enhance precipitate density in Mg alloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"263 ","pages":"Article 116667"},"PeriodicalIF":5.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-27DOI: 10.1016/j.scriptamat.2025.116655
Mengyao Zheng , Chuanwei Li , Yu Liao , Zhong Long , Jianfeng Gu
The design of hierarchical microstructure is considered as an effective approach to enhance the mechanical properties of alloys. This study has reported a novel hierarchical multiphase microstructure in an additively manufactured (CoCrNi)83Al17 multi-principal element alloy. The basic cellular unit of this novel structure is composed of a network face-centered cubic phase wrapped around an equiaxed ordered body-centered cubic (B2) phase. Three nano-phases with different compositions, sizes, and orientation relationships with the matrix are further precipitated in the equiaxed B2 phase. This novel hierarchical multiphase microstructure significantly enhances the strength of the alloy and effectively hinders the propagation of microcracks, resulting in a good combination of strength and ductility in the as-built (CoCrNi)83Al17 alloy.
{"title":"Hierarchical multiphase microstructure in additively manufactured (CoCrNi)83Al17 multi-principal element alloy with high strength","authors":"Mengyao Zheng , Chuanwei Li , Yu Liao , Zhong Long , Jianfeng Gu","doi":"10.1016/j.scriptamat.2025.116655","DOIUrl":"10.1016/j.scriptamat.2025.116655","url":null,"abstract":"<div><div>The design of hierarchical microstructure is considered as an effective approach to enhance the mechanical properties of alloys. This study has reported a novel hierarchical multiphase microstructure in an additively manufactured (CoCrNi)<sub>83</sub>Al<sub>17</sub> multi-principal element alloy. The basic cellular unit of this novel structure is composed of a network face-centered cubic phase wrapped around an equiaxed ordered body-centered cubic (B2) phase. Three nano-phases with different compositions, sizes, and orientation relationships with the matrix are further precipitated in the equiaxed B2 phase. This novel hierarchical multiphase microstructure significantly enhances the strength of the alloy and effectively hinders the propagation of microcracks, resulting in a good combination of strength and ductility in the as-built (CoCrNi)<sub>83</sub>Al<sub>17</sub> alloy.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"263 ","pages":"Article 116655"},"PeriodicalIF":5.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-27DOI: 10.1016/j.scriptamat.2025.116668
Zhipeng Liu , Cancan Ding , Ru Ge , Bin Hu , Haiwen Luo
By annealing a cold rolled 30Mn-13Al-1.3C-5Cr steel at 1000 °C, we successfully developed a novel lightweight steel having the tensile strength of 1250 MPa and total elongation of 41.4 % at the measured ultralow density of 6.36 g·cm-3. Such an unprecedented strength-ductility-density synergy results from the new designed austenite-ferrite duplex microstructures, where the granular α ferrite grains can restrain the austenite grain growth, δ ferrite bands capture and deflect the propagating cracks, and high contents of Mn/Al/C in recrystallized austenite result in the extensive precipitation of κ-carbide nanoparticles for strengthening.
{"title":"Unprecedented combination of specific tensile strength and ductility achieved in a novel duplex low-density steel","authors":"Zhipeng Liu , Cancan Ding , Ru Ge , Bin Hu , Haiwen Luo","doi":"10.1016/j.scriptamat.2025.116668","DOIUrl":"10.1016/j.scriptamat.2025.116668","url":null,"abstract":"<div><div>By annealing a cold rolled 30Mn-13Al-1.3C-5Cr steel at 1000 °C, we successfully developed a novel lightweight steel having the tensile strength of 1250 MPa and total elongation of 41.4 % at the measured ultralow density of 6.36 g·cm<sup>-3</sup>. Such an unprecedented strength-ductility-density synergy results from the new designed austenite-ferrite duplex microstructures, where the granular α ferrite grains can restrain the austenite grain growth, δ ferrite bands capture and deflect the propagating cracks, and high contents of Mn/Al/C in recrystallized austenite result in the extensive precipitation of κ-carbide nanoparticles for strengthening.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"263 ","pages":"Article 116668"},"PeriodicalIF":5.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143704874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-27DOI: 10.1016/j.scriptamat.2025.116662
Anna Kareer , Eralp Demir , Edmund Tarleton , Christopher Hardie
In this paper we present a comprehensive analysis of the contact mechanics and surface deformation associated with a micron-sized sliding contact, a critical process associated with abrasive wear. Using nanoscratch testing, we experimentally probe the surface deformation from a sharp contact. High-Resolution Electron Backscatter Diffraction (HR-EBSD) was used to characterise the stress and strain fields in the residual nanoscratch, in multiple planes. The experiments are simulated using a physically-based Crystal Plasticity Finite Element (CPFE) model, enabling a three-dimensional model that accurately captures the measured elastic and plastic strain fields around the sliding contact and allows assessment of the evolving deformation fields under load. This knowledge serves as a foundation from which we may be able to understand more complex wear situations and discern the multiphysical processes governing microscale wear.
{"title":"Localised stress and strain distribution in sliding","authors":"Anna Kareer , Eralp Demir , Edmund Tarleton , Christopher Hardie","doi":"10.1016/j.scriptamat.2025.116662","DOIUrl":"10.1016/j.scriptamat.2025.116662","url":null,"abstract":"<div><div>In this paper we present a comprehensive analysis of the contact mechanics and surface deformation associated with a micron-sized sliding contact, a critical process associated with abrasive wear. Using nanoscratch testing, we experimentally probe the surface deformation from a sharp contact. High-Resolution Electron Backscatter Diffraction (HR-EBSD) was used to characterise the stress and strain fields in the residual nanoscratch, in multiple planes. The experiments are simulated using a physically-based Crystal Plasticity Finite Element (CPFE) model, enabling a three-dimensional model that accurately captures the measured elastic and plastic strain fields around the sliding contact and allows assessment of the evolving deformation fields under load. This knowledge serves as a foundation from which we may be able to understand more complex wear situations and discern the multiphysical processes governing microscale wear.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"263 ","pages":"Article 116662"},"PeriodicalIF":5.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-26DOI: 10.1016/j.scriptamat.2025.116663
Bin Hu , Shiji Geng , Nima Babaei , Alexander Gramlich , Yichao Bai , Wenting Zhao , Junkui Li , Xinjun Sun , Caijun Zhang , Ulrich Krupp , Haiwen Luo
It was found that the electric pulsed treatment (EPT) performed at 250 °C on a medium Mn steel (MMnS) can remove all the H atoms preserved in martensite and austenite by the electrochemical H-charging; as a result, the severely deteriorated ductility and strength due to hydrogen embrittlement (HE) were both fully restored. In contrast, only the H-atoms in martensite were completely removed by the conventional heat treatment (CHT) at the same temperature, but 0.3 wt ppm H remained in austenite, resulting in the damaged ductility just restored by about 50 %. The relevant mechanism on releasing H-atoms by EPT is discussed on the basis of microstructural examinations and H-desorption kinetic measurements for explaining such an unexpected phenomenon.
{"title":"Fully restoring the damaged ductility of H-charged medium Mn steel via pulsed current","authors":"Bin Hu , Shiji Geng , Nima Babaei , Alexander Gramlich , Yichao Bai , Wenting Zhao , Junkui Li , Xinjun Sun , Caijun Zhang , Ulrich Krupp , Haiwen Luo","doi":"10.1016/j.scriptamat.2025.116663","DOIUrl":"10.1016/j.scriptamat.2025.116663","url":null,"abstract":"<div><div>It was found that the electric pulsed treatment (EPT) performed at 250 °C on a medium Mn steel (MMnS) can remove all the H atoms preserved in martensite and austenite by the electrochemical H-charging; as a result, the severely deteriorated ductility and strength due to hydrogen embrittlement (HE) were both fully restored. In contrast, only the H-atoms in martensite were completely removed by the conventional heat treatment (CHT) at the same temperature, but 0.3 wt ppm H remained in austenite, resulting in the damaged ductility just restored by about 50 %. The relevant mechanism on releasing H-atoms by EPT is discussed on the basis of microstructural examinations and H-desorption kinetic measurements for explaining such an unexpected phenomenon.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"262 ","pages":"Article 116663"},"PeriodicalIF":5.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2025-03-26DOI: 10.1016/j.scriptamat.2025.116669
N. Keskar , S.A. Mantri , Y. Danard , T. Ingale , M.S.K.K.Y. Nartu , P. Agrawal , L. Lilensten , F. Sun , F. Prima , R. Banerjee
A novel strain transformable β-metastable titanium alloy, Ti–7.5 Cr–1Sn–1Fe (TCSF), was designed using the "d-electron alloy design" method to achieve a unique balance of twinning induced plasticity (TWIP) and transformation induced plasticity (TRIP) deformation mechanisms. Tensile testing revealed excellent tensile properties, including a high yield strength ∼800 MPa, an ultimate tensile strength ∼1400 MPa, and exceptional strain-hardening over extended plastic deformation. Microstructural analysis revealed a high density of {332}〈113〉 deformation twins, with stress-induced α″ martensite forming at the twin/matrix interfaces, facilitating internal stress relaxation. This alloy exhibits a dynamic composite effect, driven by hierarchical deformation twin networks obstructing dislocation motion, enhancing strain hardening, while the local stresses generated by the deformation twinning is relaxed by stress induced martensite formation at the twin/matrix interface, promoting uniform elongation. This study highlights promising design strategies for high strength and strain hardenable Ti alloys.
{"title":"Coupling strengthening with local stress relaxation in an 800 MPa yield strength strain transformable titanium alloy","authors":"N. Keskar , S.A. Mantri , Y. Danard , T. Ingale , M.S.K.K.Y. Nartu , P. Agrawal , L. Lilensten , F. Sun , F. Prima , R. Banerjee","doi":"10.1016/j.scriptamat.2025.116669","DOIUrl":"10.1016/j.scriptamat.2025.116669","url":null,"abstract":"<div><div>A novel strain transformable β-metastable titanium alloy, Ti–7.5 Cr–1Sn–1Fe (TCSF), was designed using the \"d-electron alloy design\" method to achieve a unique balance of twinning induced plasticity (TWIP) and transformation induced plasticity (TRIP) deformation mechanisms. Tensile testing revealed excellent tensile properties, including a high yield strength ∼800 MPa, an ultimate tensile strength ∼1400 MPa, and exceptional strain-hardening over extended plastic deformation. Microstructural analysis revealed a high density of {332}〈113〉 deformation twins, with stress-induced α″ martensite forming at the twin/matrix interfaces, facilitating internal stress relaxation. This alloy exhibits a dynamic composite effect, driven by hierarchical deformation twin networks obstructing dislocation motion, enhancing strain hardening, while the local stresses generated by the deformation twinning is relaxed by stress induced martensite formation at the twin/matrix interface, promoting uniform elongation. This study highlights promising design strategies for high strength and strain hardenable Ti alloys.</div></div>","PeriodicalId":423,"journal":{"name":"Scripta Materialia","volume":"262 ","pages":"Article 116669"},"PeriodicalIF":5.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号