| Revealing the effect of inverse dislocation pileups on the mechanical properties of multi-principal element alloys | |
| Shuang, Fei; Xue J(薛健); Aifantis, Katerina E. | |
| Source Publication | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| 2024-08 | |
| Volume | 190Pages:155-171 |
| ISSN | 1005-0302 |
| Abstract | 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. |
| Keyword | Multi -principal element alloys CrCoNi Inverse dislocation pileup Strength Ductility Stress gradient |
| DOI | 10.1016/j.jmst.2023.12.021 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001182549500001 |
| WOS Research Area | Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| Classification | 一类 |
| Ranking | 2 |
| Contributor | Aifantis KE |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/97219 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.【Shuang, Fei & Aifantis, Katerina E.】 Univ Florida, Dept Mech & Aerosp Engn, Gainesville, FL 32611 USA 2.【Xue, Jian】 Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China |
| Recommended Citation 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.Rp_Au:Aifantis KE |
| 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. |
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