Spallation in homogeneous and gradient nano-grained high-entropy alloys
文献类型：期刊论文
| 作者 | Du, Xin5; Zhao, Jianfeng4; Xiang, Meizhen1; Yuan FP(袁福平)3; Yao, Xiaohu2; Zhang, Xu5 |
| 刊名 | EXTREME MECHANICS LETTERS
 |
| 出版日期 | 2025-06-01 |
| 卷号 | 77页码:9 |
| 关键词 | High-entropy alloy Nano-grained structures Molecular dynamics Shock wave Spall strength |
| ISSN号 | 2352-4316 |
| DOI | 10.1016/j.eml.2025.102342 |
| 通讯作者 | Zhang, Xu(xzhang@swjtu.edu.cn) |
| 英文摘要 | The strength and hardness can be improved by adjusting grain size in nano-grained structures. However, their behavior under extreme shock loading remains largely unexplored. This study investigates the shock wave response and spallation characteristics of homogeneous and gradient nano-grained CoCrFeMnNi high-entropy alloys (H-HEA and G-HEA) by molecular dynamics simulation. The results demonstrate that both H-HEA and G-HEA exhibit an elastic-plastic two-wave separation phenomenon, which diminishes with decreasing grain size. Notably, the spall strength of H-HEAs initially decreases and then increases as the grain size decreases, while GHEA consistently shows superior spall strength compared to H-HEA. The findings suggest that GNG structures inherently possess better shock resistance. The spall strength is closely related to the nucleation ability of voids, which is dominated by the content of disordered structure. In nano-grained structures, voids mainly nucleate at grain boundaries, and the subsequent growth and coalescence lead to intergranular fracture. Additionally, shock loading induces various plastic mechanisms such as stacking faults, deformation twinning, and phase transformations. These findings underscore the critical role of microstructural design, especially GNG structure, in enhancing the shock mechanical properties of HEAs and contribute to the application of HEA in extreme shock environments. |
| 分类号 | 二类/Q1 |
| WOS关键词 | MOLECULAR-DYNAMICS ; DEFORMATION ; BEHAVIOR |
| 资助项目 | National Natural Science Foundation of China[12222209] ; Sichuan Science and Technology Program[2024NSFJQ0068] |
| WOS研究方向 | Engineering ; Materials Science ; Mechanics |
| 语种 | 英语 |
| WOS记录号 | WOS:001483691300001 |
| 资助机构 | National Natural Science Foundation of China ; Sichuan Science and Technology Program |
| 其他责任者 | Zhang, Xu |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/101190]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Inst Appl Phys & Computat Math, Lab Computat Phys, Beijing 100088, Peoples R China; 2.South China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 4.Southwest Jiaotong Univ, Sch Mat Sci & Engn, Chengdu 610031, Peoples R China; 5.Southwest Jiaotong Univ, Sch Mech & Aerosp Engn, Sichuan Prov Key Lab Adv Struct Mat Mech Behav & S, Chengdu 610031, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Du, Xin,Zhao, Jianfeng,Xiang, Meizhen,et al. Spallation in homogeneous and gradient nano-grained high-entropy alloys[J]. EXTREME MECHANICS LETTERS,2025,77:9. |
| APA | Du, Xin,Zhao, Jianfeng,Xiang, Meizhen,袁福平,Yao, Xiaohu,&Zhang, Xu.(2025).Spallation in homogeneous and gradient nano-grained high-entropy alloys.EXTREME MECHANICS LETTERS,77,9. |
| MLA | Du, Xin,et al."Spallation in homogeneous and gradient nano-grained high-entropy alloys".EXTREME MECHANICS LETTERS 77(2025):9. |
入库方式： OAI收割
来源：力学研究所
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