Pub Date : 2024-07-31DOI: 10.1016/j.jmrt.2024.07.181
Yilin Jia, Kun Zhou, Wanting Sun, Min Ding, Yu Wang, Xiangqing Kong, Dongzhou Jia, Muhong Wu, Ying Fu
Carbon nanotubes (CNTs), as potent reinforcements in composites, have demonstrated excellent strengthening effects when combined with copper in numerous recent studies. Challenges remain in the application of these composites and in fully leveraging the reinforcing capabilities of CNTs to achieve comprehensive performance enhancement. The performance of CNTs/Cu composites can be flexibly regulated owing to the unique structure and properties of CNTs. To achieve the fabrication of high-performance and diverse CNTs/Cu composites, a profound understanding of the reinforcement mechanisms of CNTs in the composites is essential, along with the consideration of key influencing factors on performance. This article provides a comprehensive overview of the reinforcement mechanisms of CNTs on the mechanical, electrical, and thermal properties of CNTs/Cu composites. Factors influencing the effectiveness of CNT reinforcement in composites are discussed, including the attributes and dispersion of CNTs, the architectures of composites, and the interface between CNTs and Cu. Furthermore, this study explores the role of CNTs in addressing the trade-off between high strength and high conductivity as well as between high strength and high ductility in the copper matrix.
{"title":"Enhancement mechanisms of mechanical, electrical and thermal properties of carbon nanotube-copper composites: A review","authors":"Yilin Jia, Kun Zhou, Wanting Sun, Min Ding, Yu Wang, Xiangqing Kong, Dongzhou Jia, Muhong Wu, Ying Fu","doi":"10.1016/j.jmrt.2024.07.181","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.181","url":null,"abstract":"Carbon nanotubes (CNTs), as potent reinforcements in composites, have demonstrated excellent strengthening effects when combined with copper in numerous recent studies. Challenges remain in the application of these composites and in fully leveraging the reinforcing capabilities of CNTs to achieve comprehensive performance enhancement. The performance of CNTs/Cu composites can be flexibly regulated owing to the unique structure and properties of CNTs. To achieve the fabrication of high-performance and diverse CNTs/Cu composites, a profound understanding of the reinforcement mechanisms of CNTs in the composites is essential, along with the consideration of key influencing factors on performance. This article provides a comprehensive overview of the reinforcement mechanisms of CNTs on the mechanical, electrical, and thermal properties of CNTs/Cu composites. Factors influencing the effectiveness of CNT reinforcement in composites are discussed, including the attributes and dispersion of CNTs, the architectures of composites, and the interface between CNTs and Cu. Furthermore, this study explores the role of CNTs in addressing the trade-off between high strength and high conductivity as well as between high strength and high ductility in the copper matrix.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"101 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The high-density Fe-6.5 wt% Si soft magnetic alloy samples were prepared using selective laser melting (SLM) technology. Annealing treatments with different temperatures were employed to promote grain growth. The microstructure, texture and magnetic hysteresis loops were characterized, aiming to investigate the relationship between microstructure and magnetic properties. The as-printed Fe-6.5 wt% Si alloy had weak texture and low density of ordered phases, and was featured by coarse grains in the top-view section and columnar grains in the side-view section. After annealing at 800 °C–1000 °C, the textures were slightly weakened, while the grain growth was not significant. Increasing the annealing temperature to 1100 °C led to abnormal grain growth behaviors. The grains of the as-printed Fe-6.5 wt% Si alloy showed randomly abnormal growth behaviors rather than oriented growth, which may be related to the low stored energy and initial size advantage before annealing. After annealed at 1100 °C for 1 h, the abnormal grain growth and the formation of large Goss ({110}<001>) and Cube ({100}<001>) grains resulted in microstructure coarsening and texture optimization. Thus, the corresponding ring-shaped sample exhibited excellent magnetic performance. The magnetic induction B is 1.21 T, the maximum relative permeability is 14.71 × 10 and the core loss P is 11.69 W/kg.
利用选择性激光熔化（SLM）技术制备了高密度 Fe-6.5 wt% Si 软磁合金样品。采用不同温度的退火处理促进晶粒生长。对样品的微观结构、质地和磁滞回线进行了表征，旨在研究微观结构与磁性能之间的关系。压印后的 Fe-6.5 wt% Si 合金质地较弱，有序相密度较低，顶视图部分为粗大晶粒，侧视图部分为柱状晶粒。在 800 ℃-1000 ℃ 退火后，纹理略有减弱，晶粒生长不明显。将退火温度提高到 1100 ℃会导致异常的晶粒生长行为。原样印刷的 Fe-6.5 wt% Si 合金的晶粒表现出随机的异常生长行为，而不是取向生长，这可能与退火前的低储能和初始尺寸优势有关。在 1100 °C 下退火 1 小时后，晶粒异常生长，形成了大的 Goss（{110}）和 Cube（{100}）晶粒，导致了微观结构的粗化和纹理优化。因此，相应的环形样品表现出优异的磁性能。磁感应强度 B 为 1.21 T，最大相对磁导率为 14.71 × 10，磁芯损耗 P 为 11.69 W/kg。
{"title":"Influence of annealing treatment on grain growth, texture and magnetic properties of a selective laser melted Fe-6.5 wt% Si alloy","authors":"Lulan Jiang, Haijie Xu, Yuhan Zhan, Dewei Zhang, Xuedao Shu, Zixuan Li, Jinrong Zuo","doi":"10.1016/j.jmrt.2024.07.211","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.211","url":null,"abstract":"The high-density Fe-6.5 wt% Si soft magnetic alloy samples were prepared using selective laser melting (SLM) technology. Annealing treatments with different temperatures were employed to promote grain growth. The microstructure, texture and magnetic hysteresis loops were characterized, aiming to investigate the relationship between microstructure and magnetic properties. The as-printed Fe-6.5 wt% Si alloy had weak texture and low density of ordered phases, and was featured by coarse grains in the top-view section and columnar grains in the side-view section. After annealing at 800 °C–1000 °C, the textures were slightly weakened, while the grain growth was not significant. Increasing the annealing temperature to 1100 °C led to abnormal grain growth behaviors. The grains of the as-printed Fe-6.5 wt% Si alloy showed randomly abnormal growth behaviors rather than oriented growth, which may be related to the low stored energy and initial size advantage before annealing. After annealed at 1100 °C for 1 h, the abnormal grain growth and the formation of large Goss ({110}<001>) and Cube ({100}<001>) grains resulted in microstructure coarsening and texture optimization. Thus, the corresponding ring-shaped sample exhibited excellent magnetic performance. The magnetic induction B is 1.21 T, the maximum relative permeability is 14.71 × 10 and the core loss P is 11.69 W/kg.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"191 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-30DOI: 10.1016/j.jmrt.2024.07.223
Abdul Hakeem, Thamraa Alshahrani, Ghulam Muhammad, M.H. Alhossainy, A. Laref, Abdul Rauf Khan, Irshad Ali, Hafiz Muhammad Tahir Farid, T. Ghrib, Syeda Rabia Ejaz, Rabia Yasmin Khosa
{"title":"Corrigendum to ‘Magnetic, dielectric and structural properties of spinel ferrites synthesized by sol-gel method’ [J. Mater. Res. Technol. Volume 11, March–April 2021, Pages 158-169]","authors":"Abdul Hakeem, Thamraa Alshahrani, Ghulam Muhammad, M.H. Alhossainy, A. Laref, Abdul Rauf Khan, Irshad Ali, Hafiz Muhammad Tahir Farid, T. Ghrib, Syeda Rabia Ejaz, Rabia Yasmin Khosa","doi":"10.1016/j.jmrt.2024.07.223","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.223","url":null,"abstract":"","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Oxide-dispersion-strengthened (ODS) steels are candidate materials for application in advanced nuclear reactors. In this study, the low-cycle fatigue performances of 13Cr-ODS ferritic steel pipes were investigated at 600, 700, and 800 °C. Cyclic softening was observed at high strain amplitudes with an increase in the number of fatigue cycles. However, cyclic hardening appeared first, and then cyclic softening occurred at a low strain amplitude with the increase in the number of fatigue cycles. By comparing the cyclic stress–strain curves and the monotonic stress–strain curves, it was found that cyclic softening occurred regardless of the strain amplitude. The Coffin–Manson and Basquin equations were used to predict the fatigue of the pipes. Microstructure analysis indicated that cyclic softening was induced by the dynamic recovery and recrystallization, which reduced the number of low-angle grain boundaries in the deformed grains by promoting dislocation annihilation and reorganization. A complex multi-layer core–shell structure with a large size (∼500 nm) was observed.
{"title":"Low-cycle fatigue behavior and microstructure evolution of ODS steel pipes at high temperatures","authors":"Yuntao Zhong, Yongduo Sun, Yufeng Du, Zhenyu Zhao, Yong Chen, Huan Sheng Lai, Ruiqian Zhang","doi":"10.1016/j.jmrt.2024.07.213","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.213","url":null,"abstract":"Oxide-dispersion-strengthened (ODS) steels are candidate materials for application in advanced nuclear reactors. In this study, the low-cycle fatigue performances of 13Cr-ODS ferritic steel pipes were investigated at 600, 700, and 800 °C. Cyclic softening was observed at high strain amplitudes with an increase in the number of fatigue cycles. However, cyclic hardening appeared first, and then cyclic softening occurred at a low strain amplitude with the increase in the number of fatigue cycles. By comparing the cyclic stress–strain curves and the monotonic stress–strain curves, it was found that cyclic softening occurred regardless of the strain amplitude. The Coffin–Manson and Basquin equations were used to predict the fatigue of the pipes. Microstructure analysis indicated that cyclic softening was induced by the dynamic recovery and recrystallization, which reduced the number of low-angle grain boundaries in the deformed grains by promoting dislocation annihilation and reorganization. A complex multi-layer core–shell structure with a large size (∼500 nm) was observed.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"85 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-30DOI: 10.1016/j.jmrt.2024.07.111
Gao Lei, Ma Huaijin, Wang Pengyu, Cheng Juan, Zhang Yingde, Yun Huiqin, Guo Fei, Zhang Pengchao, Song Boyu, Huang Jiaohong, Jin Xiang
High entropy amorphous alloys (HE AMs) have attracted extensive interest lately due to their superior magnetocaloric properties. However, the critical behavior and mechanical properties have received less research, which restricts their applications. This work presented a comprehensive investigation of the magnetocaloric effect (MCE), critical behavior, and mechanical performance of quinary GdDyErAlM (M = Fe, Co, Ni) HE AMs. All samples exhibited distinct spin glass-like behavior below and competitive MCE around hydrogen liquefaction temperature range. Excellent MCE was achieved by the HE AMs through a second-order phase transition from paramagnetic state to ferromagnetic state at 79 K for Fe, 41 K for Co, and 36 K for Ni. Among them, the maximum magnetic entropy change (-Δ) of GdDyErAlCo amorphous alloys was 9.59 J kg K under 0–5 T. Furthermore, and of GdDyErAlFe amorphous alloys were respectively 519 J kg and 613 J kg, larger than that of most RE-based amorphous alloys. For all samples, the critical behavior of the phase transition approached the mean field model, and this responded to the long-range ordering of the magnetic interaction. The bending plasticity of GdDyErAlM (M = Fe, Co, Ni) HE AMs were 0.78, 1.03, 0.89, respectively. The adjustable , large (-Δ), high , and outstanding mechanical properties suggested GdDyErAlM (M = Fe, Co, Ni) HE AMs may find utility as magnetic refrigerants in low-temperature applications.
{"title":"Cryogenic temperature magnetocaloric effect and critical behavior of GdDyErAlM (M=Fe, Co, Ni) high entropy amorphous alloys","authors":"Gao Lei, Ma Huaijin, Wang Pengyu, Cheng Juan, Zhang Yingde, Yun Huiqin, Guo Fei, Zhang Pengchao, Song Boyu, Huang Jiaohong, Jin Xiang","doi":"10.1016/j.jmrt.2024.07.111","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.111","url":null,"abstract":"High entropy amorphous alloys (HE AMs) have attracted extensive interest lately due to their superior magnetocaloric properties. However, the critical behavior and mechanical properties have received less research, which restricts their applications. This work presented a comprehensive investigation of the magnetocaloric effect (MCE), critical behavior, and mechanical performance of quinary GdDyErAlM (M = Fe, Co, Ni) HE AMs. All samples exhibited distinct spin glass-like behavior below and competitive MCE around hydrogen liquefaction temperature range. Excellent MCE was achieved by the HE AMs through a second-order phase transition from paramagnetic state to ferromagnetic state at 79 K for Fe, 41 K for Co, and 36 K for Ni. Among them, the maximum magnetic entropy change (-Δ) of GdDyErAlCo amorphous alloys was 9.59 J kg K under 0–5 T. Furthermore, and of GdDyErAlFe amorphous alloys were respectively 519 J kg and 613 J kg, larger than that of most RE-based amorphous alloys. For all samples, the critical behavior of the phase transition approached the mean field model, and this responded to the long-range ordering of the magnetic interaction. The bending plasticity of GdDyErAlM (M = Fe, Co, Ni) HE AMs were 0.78, 1.03, 0.89, respectively. The adjustable , large (-Δ), high , and outstanding mechanical properties suggested GdDyErAlM (M = Fe, Co, Ni) HE AMs may find utility as magnetic refrigerants in low-temperature applications.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The laser welding of dissimilar 2219 Al–Cu and 2195 Al–Li alloys is a significant attempt in the fabrication of rocket propellant tanks, aiming at the escalating demands for weight reduction and cost efficiency. The variances in microstructure evolution for 2219/2195 aluminum alloys laser welded joint deserves thorough investigation because it certainly results in the discrepancies in mechanical property In this paper, the temperature field, microstructure, element distribution, grain orientation, and texture on both sides of the laser welded joint were comprehensively investigated through a combination of simulations and experiments. The tensile strength was tested and the fracture mechanism was analyzed based on the microstructure characteristic. It is found that the wider columnar dendrites zone is generated due to the large temperature gradient from on the 2195 Al–Li alloy side. The grain orientation of the non-dendrite equiaxed zone (EQZ) and columnar grain near the fusion line are significantly influenced by the grain orientation of base metal (BM). On the one side of 2195 Al–Li alloy, the majority of grains feature diameters predominantly within the 3–6 μm range. The region in the vicinity of fusion line on one side of the 2195 Al–Li alloy has the weakest performance. It is deduced that the poor tensile property on one side of the 2195 Al–Li alloy is not only attributed to the loss of Mg and Li elements, but also owing to the evolution of texture. The rotated goss texture with high intensity is formed in EQZ near the fusion line on one side of 2219 Al–Cu alloy.
{"title":"Unravelling asymmetrical microstructure evolution and tensile fracture mechanism in laser welding of dissimilar 2219/2195 aluminum alloys","authors":"Yanqiu Zhao, Lujing Hao, Ruizu Liu, Jianfeng Wang, Yuqin Zeng, Xiaohong Zhan","doi":"10.1016/j.jmrt.2024.07.087","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.087","url":null,"abstract":"The laser welding of dissimilar 2219 Al–Cu and 2195 Al–Li alloys is a significant attempt in the fabrication of rocket propellant tanks, aiming at the escalating demands for weight reduction and cost efficiency. The variances in microstructure evolution for 2219/2195 aluminum alloys laser welded joint deserves thorough investigation because it certainly results in the discrepancies in mechanical property In this paper, the temperature field, microstructure, element distribution, grain orientation, and texture on both sides of the laser welded joint were comprehensively investigated through a combination of simulations and experiments. The tensile strength was tested and the fracture mechanism was analyzed based on the microstructure characteristic. It is found that the wider columnar dendrites zone is generated due to the large temperature gradient from on the 2195 Al–Li alloy side. The grain orientation of the non-dendrite equiaxed zone (EQZ) and columnar grain near the fusion line are significantly influenced by the grain orientation of base metal (BM). On the one side of 2195 Al–Li alloy, the majority of grains feature diameters predominantly within the 3–6 μm range. The region in the vicinity of fusion line on one side of the 2195 Al–Li alloy has the weakest performance. It is deduced that the poor tensile property on one side of the 2195 Al–Li alloy is not only attributed to the loss of Mg and Li elements, but also owing to the evolution of texture. The rotated goss texture with high intensity is formed in EQZ near the fusion line on one side of 2219 Al–Cu alloy.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141783687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, an equiatomic Ti-V-Al-Nb-Hf high-entropy alloy (HEA) was designed by thermodynamic simulation and prepared experimentally via a powder metallurgy approach. A nanoindentation and nano scratch technique was used to study the mechanical and friction behavior of the HEA. The results revealed that a nano hardness of 7.39 ± 0.4 GPa and an elastic modulus of 140.75 ± 6.3 GPa was achieved. The coefficient of friction (COF) and creep behavior of the alloy were studied by scratch tests in ramping mode under constant-loading conditions. The COF quickly increased as the normal load increased at the beginning stage of creep performance. Additionally, three-dimensional modeling was performed to obtain a graphical representation, which can be used to explore the morphology and geometry of the scratched track. From the experimental findings, the creep behavior of the alloy is classified into two separate regimes: transient and steady-state regions. The present study demonstrates the scratch and creep behavior of the HEA in the context of the scratch mechanisms.
在这项工作中，通过热力学模拟设计了等原子 Ti-V-Al-Nb-Hf 高熵合金 (HEA)，并通过粉末冶金方法进行了实验制备。采用纳米压痕和纳米划痕技术研究了 HEA 的机械和摩擦行为。结果显示，纳米硬度为 7.39 ± 0.4 GPa，弹性模量为 140.75 ± 6.3 GPa。在恒定加载条件下，通过斜坡模式划痕试验研究了合金的摩擦系数（COF）和蠕变行为。在蠕变性能的初始阶段，随着法向载荷的增加，摩擦系数迅速增大。此外，还进行了三维建模，以获得图形表示，用于探索划痕轨迹的形态和几何形状。从实验结果来看，合金的蠕变行为分为两种不同的状态：瞬态区和稳态区。本研究从划痕机理的角度展示了 HEA 的划痕和蠕变行为。
{"title":"Microstructure and nanoscratch behavior of spark-plasma-sintered Ti-V-Al-Nb-Hf high-entropy alloy","authors":"Sheetal Kumar Dewangan, Nagarjuna Cheenepalli, Hansung Lee, Byungmin Ahn","doi":"10.1016/j.jmrt.2024.07.081","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.081","url":null,"abstract":"In this work, an equiatomic Ti-V-Al-Nb-Hf high-entropy alloy (HEA) was designed by thermodynamic simulation and prepared experimentally via a powder metallurgy approach. A nanoindentation and nano scratch technique was used to study the mechanical and friction behavior of the HEA. The results revealed that a nano hardness of 7.39 ± 0.4 GPa and an elastic modulus of 140.75 ± 6.3 GPa was achieved. The coefficient of friction (COF) and creep behavior of the alloy were studied by scratch tests in ramping mode under constant-loading conditions. The COF quickly increased as the normal load increased at the beginning stage of creep performance. Additionally, three-dimensional modeling was performed to obtain a graphical representation, which can be used to explore the morphology and geometry of the scratched track. From the experimental findings, the creep behavior of the alloy is classified into two separate regimes: transient and steady-state regions. The present study demonstrates the scratch and creep behavior of the HEA in the context of the scratch mechanisms.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141783616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-23DOI: 10.1016/j.jmrt.2024.07.148
Xiaoqiang Wang, Yakun Tao, Yan Zhou, Shifeng Wen, Yusheng Shi
A comprehensive understanding of cracking mechanisms and the prevention of interfacial microcrack formation are imperative for additive manufacturing of high-performance multi-material heterostructures. This study systematically investigated 316L/CuSn10 heterostructures and identified solidification cracking and solid-state cracking as the predominant mechanisms. Solidification cracking is closely linked to the copper content within the mixing zone, particularly evident at 10% copper content, which heightens sensitivity to solidification cracking due to the widening of intergranular spacing and the elongation of the liquid film channel. Solid-state cracks tend to initiate from pre-existing solidification cracks, propagate along high-angle grain boundaries (HAGBs), particularly within a specific misorientation angle range of 20°-50°, terminating eventually at low-angle grain boundaries (LAGBs). This is mainly controlled by the distribution of dislocations at crack tips, which are dispersed within the grains at LAGBs, and the resulting back stress contributes to crack termination. These findings contribute valuable insights into the cracking mechanisms in heterostructures and offer guidance for the fabrication of crack-free steel-copper components.
{"title":"Unraveling the dual cracking mechanism of 316L/CuSn10 heterostructures fabricated by laser powder bed fusion","authors":"Xiaoqiang Wang, Yakun Tao, Yan Zhou, Shifeng Wen, Yusheng Shi","doi":"10.1016/j.jmrt.2024.07.148","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.148","url":null,"abstract":"A comprehensive understanding of cracking mechanisms and the prevention of interfacial microcrack formation are imperative for additive manufacturing of high-performance multi-material heterostructures. This study systematically investigated 316L/CuSn10 heterostructures and identified solidification cracking and solid-state cracking as the predominant mechanisms. Solidification cracking is closely linked to the copper content within the mixing zone, particularly evident at 10% copper content, which heightens sensitivity to solidification cracking due to the widening of intergranular spacing and the elongation of the liquid film channel. Solid-state cracks tend to initiate from pre-existing solidification cracks, propagate along high-angle grain boundaries (HAGBs), particularly within a specific misorientation angle range of 20°-50°, terminating eventually at low-angle grain boundaries (LAGBs). This is mainly controlled by the distribution of dislocations at crack tips, which are dispersed within the grains at LAGBs, and the resulting back stress contributes to crack termination. These findings contribute valuable insights into the cracking mechanisms in heterostructures and offer guidance for the fabrication of crack-free steel-copper components.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141783615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-23DOI: 10.1016/j.jmrt.2024.07.147
Dengke Liu, Xuewen Zong, Pengsheng Xue, Yan Zhang, Hongzhi Zhou, Zhongtang Gao, Rui Wang, Bingheng Lu
In order to explore the forming mechanism of direct energy deposition of magnesium-lithium alloy wire with high lithium content, this study introduces a novel approach utilizing Cold Metal Transfer Wire Arc Additive Manufacturing (CMT-WAAM) to successfully fabricate thin-walled structures of LA103Z Mg-Li alloy. A comprehensive comparison was conducted to evaluate the microstructure and mechanical properties of different regions on CMT-WAAM samples, in addition to cast and rolled samples. The microstructure of CMT-WAAM samples is mainly composed of β-Li phase and fine needle shaped α-Mg phase, exhibiting a notable divergence from the microstructure observed in cast and rolled samples. It is noteworthy that the mechanical properties along the deposition direction exhibited significant variability in CMT-WAAM samples, but no significant anisotropy is discerned in the mechanical properties along the deposition and scanning directions. The discrepancies in mechanical properties across different regions are predominantly attributed to variations in grain size, and the size and proportion of the α-Mg phase and secondary phases, which are related to the low heat input and high cooling rate of the CMT-WAAM process. The mean tensile strength of CMT-WAAM samples is 159.5 MPa, marking a respective increase of 30.7% and 13.9% compared to cast and rolled samples. These findings underscore the outstanding strength of CMT-WAAM samples compared to conventionally formed samples. This study provides novel insights into additive manufacturing of dual-phase Mg-Li alloys for large-scale complex structures.
{"title":"Comprehensive study on the differences in microstructure and mechanical properties of Mg-Li alloy fabricated by additive manufacturing, casting, and rolling","authors":"Dengke Liu, Xuewen Zong, Pengsheng Xue, Yan Zhang, Hongzhi Zhou, Zhongtang Gao, Rui Wang, Bingheng Lu","doi":"10.1016/j.jmrt.2024.07.147","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.147","url":null,"abstract":"In order to explore the forming mechanism of direct energy deposition of magnesium-lithium alloy wire with high lithium content, this study introduces a novel approach utilizing Cold Metal Transfer Wire Arc Additive Manufacturing (CMT-WAAM) to successfully fabricate thin-walled structures of LA103Z Mg-Li alloy. A comprehensive comparison was conducted to evaluate the microstructure and mechanical properties of different regions on CMT-WAAM samples, in addition to cast and rolled samples. The microstructure of CMT-WAAM samples is mainly composed of β-Li phase and fine needle shaped α-Mg phase, exhibiting a notable divergence from the microstructure observed in cast and rolled samples. It is noteworthy that the mechanical properties along the deposition direction exhibited significant variability in CMT-WAAM samples, but no significant anisotropy is discerned in the mechanical properties along the deposition and scanning directions. The discrepancies in mechanical properties across different regions are predominantly attributed to variations in grain size, and the size and proportion of the α-Mg phase and secondary phases, which are related to the low heat input and high cooling rate of the CMT-WAAM process. The mean tensile strength of CMT-WAAM samples is 159.5 MPa, marking a respective increase of 30.7% and 13.9% compared to cast and rolled samples. These findings underscore the outstanding strength of CMT-WAAM samples compared to conventionally formed samples. This study provides novel insights into additive manufacturing of dual-phase Mg-Li alloys for large-scale complex structures.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141783691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-21DOI: 10.1016/j.jmrt.2024.07.102
Chenchong Du, Feng Jiang, Bicheng Guo, Yong Zhang
Austenitic Fe–Cr–Ni stainless steel is widely used in aviation, chemistry, energy, due to its excellent properties of high-temperature performance. In this study, the splitting Hopkinson pressure bar with high-temperature system was employed to evaluate the dynamic mechanical properties of Fe–Cr–Ni stainless steel. The true stress-strain curves were obtained under varying conditions, including variable strains, strain rates and temperatures. The true stress increases and levels off as the true strain increases, while increases as the strain rate increases, but decreases sharply as the deformation temperature rises. The deformation temperature is consist of healing temperature and adiabatic temperature. The adiabatic temperature rise related to the specific heat capacity was calculated. The actual deformation temperatures were calculated under different strains by combining the true stress-strain curves. The true stress-strain curve under variable temperature was corrected to the stress-strain curve under isothermal state by using the thermal softening rate, which decoupled the strain and temperature. The Power-Law and Johnson-Cook constitutive models were fitted based on the real stress-strain isothermal curve. The fitting accuracy of Power-Law model was 1.61% for different strain rates at room temperature in average, 3.51% for fixed strain rate at different temperatures. While the fitting accuracy of Johnson-Cook model was 2.94% for different strain rates at room temperature in average, 6.18% for fixed strain rate at different temperatures.
{"title":"Dynamic constitutive model of Fe–Cr–Ni stainless steel based on isothermal true stress-strain curves","authors":"Chenchong Du, Feng Jiang, Bicheng Guo, Yong Zhang","doi":"10.1016/j.jmrt.2024.07.102","DOIUrl":"https://doi.org/10.1016/j.jmrt.2024.07.102","url":null,"abstract":"Austenitic Fe–Cr–Ni stainless steel is widely used in aviation, chemistry, energy, due to its excellent properties of high-temperature performance. In this study, the splitting Hopkinson pressure bar with high-temperature system was employed to evaluate the dynamic mechanical properties of Fe–Cr–Ni stainless steel. The true stress-strain curves were obtained under varying conditions, including variable strains, strain rates and temperatures. The true stress increases and levels off as the true strain increases, while increases as the strain rate increases, but decreases sharply as the deformation temperature rises. The deformation temperature is consist of healing temperature and adiabatic temperature. The adiabatic temperature rise related to the specific heat capacity was calculated. The actual deformation temperatures were calculated under different strains by combining the true stress-strain curves. The true stress-strain curve under variable temperature was corrected to the stress-strain curve under isothermal state by using the thermal softening rate, which decoupled the strain and temperature. The Power-Law and Johnson-Cook constitutive models were fitted based on the real stress-strain isothermal curve. The fitting accuracy of Power-Law model was 1.61% for different strain rates at room temperature in average, 3.51% for fixed strain rate at different temperatures. While the fitting accuracy of Johnson-Cook model was 2.94% for different strain rates at room temperature in average, 6.18% for fixed strain rate at different temperatures.","PeriodicalId":501120,"journal":{"name":"Journal of Materials Research and Technology","volume":"139 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141783702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：