Revealing the effect of inverse dislocation pileups on the mechanical properties of multi-principal element alloys
文献类型：期刊论文
| 作者 | Shuang, Fei; Xue J(薛健); Aifantis, Katerina E. |
| 刊名 | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2024-08 |
| 卷号 | 190页码:155-171 |
| 关键词 | Multi -principal element alloys CrCoNi Inverse dislocation pileup Strength Ductility Stress gradient |
| ISSN号 | 1005-0302 |
| DOI | 10.1016/j.jmst.2023.12.021 |
| 英文摘要 | In this work, we utilize atomistic simulations and dislocation mechanics to explore the formation of inverse pileups in CrCoNi model alloys and elucidate their unique impact on the strength and ductility of multi-principal element alloys (MPEAs). The present atomistic simulations on single crystals reveal that during the deformation of CrCoNi, stress gradients lead to the formation of novel inverse dislocation pileup. We find that this unique dislocation pattern in a confined volume is due to the elevated lattice friction and significant stress gradient present in the material. Furthermore, this phenomenon can be notably promoted by lowering the temperature, increasing the loading rate, and introducing chemical short-range ordering. Additional simulations on bicrystals show that these inverse pileups play a critical role in suppressing dislocation transmission, reflection, and grain boundary (GB) migration. As a result, they effectively mitigate stress concentration and reduce damage accumulation at GBs, lowering the risk of catastrophic failure due to GB damages. In our theoretical analysis, we utilize dislocation mechanics to predict the formation of the inverse pileup and its subsequent strengthening effect, considering scenarios with and without obstacles. Our investigations encompass various lattice frictions and stress gradients. Remarkably, our results shed light on the prevailing impact of dislocation hardening in the plastic deformation of CrCoNi even under the presence of a linear stress gradient, while the contribution of GB strengthening is found to be comparatively limited. These findings provide valuable insights into the deformation mechanisms of MPEAs in general and significantly aid their applications as promising structural materials. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. |
| 分类号 | 一类 |
| WOS研究方向 | Materials Science ; Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001182549500001 |
| 其他责任者 | Aifantis KE |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/97219]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.【Xue, Jian】 Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China 2.【Shuang, Fei & Aifantis, Katerina E.】 Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA |
| 推荐引用方式 GB/T 7714 | Shuang, Fei,Xue J,Aifantis, Katerina E.. Revealing the effect of inverse dislocation pileups on the mechanical properties of multi-principal element alloys[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2024,190:155-171. |
| APA | Shuang, Fei,薛健,&Aifantis, Katerina E..(2024).Revealing the effect of inverse dislocation pileups on the mechanical properties of multi-principal element alloys.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,190,155-171. |
| MLA | Shuang, Fei,et al."Revealing the effect of inverse dislocation pileups on the mechanical properties of multi-principal element alloys".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 190(2024):155-171. |
入库方式： OAI收割
来源：力学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。