| Atomistic interpretation of extra temperature and strain-rate sensitivity of heterogeneous dislocation nucleation in a multi-principal-element alloy | |
Dai SC(戴仕诚)1,2; Xie ZC(谢周璨)1,2; Wang YJ(王云江)1,2
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| Corresponding Author | Wang, Yun-Jiang([email protected]) |
| Source Publication | INTERNATIONAL JOURNAL OF PLASTICITY
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| 2022-02-01 | |
| Volume | 149Pages:16 |
| ISSN | 0749-6419 |
| Abstract | Incipient plasticity of crystals is usually initiated from versatile pre-existing crystalline defects of different geometries and length scales that formed during materials fabrication and processing, which is closely associated with the mechanical properties. Here we study the heterogeneous dislocation nucleation behaviors from an existing nanoscale void embedded in a prototypical multi-principal-element (MPE) NiCoCr alloy via atomistical exploration of possible minimum energy pathways and analyzes of the dislocation kinetics by a continuum-level mechanistic model, in comparison with the same plastic mechanism in an elemental face-centered cubic copper. It is found that the rough nucleation pathway of dislocation brings about extra thermal softening and strain-rate sensitivity for the critical nucleation stress of dislocation in the MPE alloy, which reproduces the experimental observations. The extra temperature softening is revealed to be associated with the high total entropy of the MPE alloy, in which the configurational entropy plays a dominating role rather than the vibrational counterpart. The extra strain rate sensitivity is caused by the relatively small activation volume in MPE alloy. Our strategy offers physical understanding of the experimental phenomena with atomistic details, which also emphasizes the critical role of configurational disorder in the dislocation accommodated plasticity in the generic complex concentrated alloys. |
| Keyword | Multi-principal-element alloy Dislocation nucleation Rate and temperature sensitivity Minimum energy pathway Molecular dynamics |
| DOI | 10.1016/j.ijplas.2021.103155 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000788358900001 |
| WOS Keyword | SHORT-RANGE ORDER ; HIGH-ENTROPY ; TRACER DIFFUSION ; METALLIC GLASSES ; CROSS-SLIP ; STRENGTH ; DEFORMATION ; DYNAMICS ; MECHANISMS ; PLASTICITY |
| WOS Research Area | Engineering ; Materials Science ; Mechanics |
| WOS Subject | Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics |
| Funding Project | National Natural Science Foundation of China[12072344] ; National Key Research and Development Program of China[2017YFB0701502] ; Youth Innovation Promotion Association of Chinese Academy of Sciences[2017025] |
| Funding Organization | National Natural Science Foundation of China ; National Key Research and Development Program of China ; Youth Innovation Promotion Association of Chinese Academy of Sciences |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Wang, Yun-Jiang |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/89091 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China |
| Recommended Citation GB/T 7714 | Dai SC,Xie ZC,Wang YJ. Atomistic interpretation of extra temperature and strain-rate sensitivity of heterogeneous dislocation nucleation in a multi-principal-element alloy[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2022,149:16.Rp_Au:Wang, Yun-Jiang |
| APA | 戴仕诚,谢周璨,&王云江.(2022).Atomistic interpretation of extra temperature and strain-rate sensitivity of heterogeneous dislocation nucleation in a multi-principal-element alloy.INTERNATIONAL JOURNAL OF PLASTICITY,149,16. |
| MLA | 戴仕诚,et al."Atomistic interpretation of extra temperature and strain-rate sensitivity of heterogeneous dislocation nucleation in a multi-principal-element alloy".INTERNATIONAL JOURNAL OF PLASTICITY 149(2022):16. |
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| Jp2022FA531_2022_Ato（5160KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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