Atomistic tensile deformation mechanisms in a CrCoNi medium-entropy alloy with gradient nano-grained structure at cryogenic temperature
文献类型：期刊论文
| 作者 | Tao, Yuhao; Cheng WQ(程文强) ; Wang W(王为)
|
| 刊名 | FRONTIERS IN MATERIALS
 |
| 出版日期 | 2023-01-06 |
| 卷号 | 9页码:8 |
| ISSN号 | 2296-8016 |
| 关键词 | molecular dynamics gradient nano-grained cryogenic temperature hetero-deformation induced hardening stacking fault factor |
| DOI | 10.3389/fmats.2022.1118952 |
| 通讯作者 | Wang, Wei(wangwei2@imech.ac.cn) |
| 英文摘要 | Large-scale molecular dynamics (MD) simulations have been utilized to reveal the atomistic deformation mechanisms of a CrCoNi medium-entropy alloy (MEA) with gradient nano-grained (GNG) structure in the present study. Strong strain hardening was observed in the gradient nano-grained structure at the elasto-plastic transition stage, which could be attributed to the Masing hardening. After yielding, obvious partitioning of tensile strain was detected in the gradient nano-grained structure, which indicates the existence of hetero-deformation induced (HDI) hardening effect and could account for the higher flow stress of the gradient nano-grained structure than that calculated by the rule of mixture from its homogenous nano-grained (NG) structured counterparts. Moreover, partitioning of stacking fault factor (corresponding to the partitioning of tensile strain), which demonstrates the intensity of dislocation behaviors, was also observed in the gradient nano-grained structure. The differences of factors for each grain size area were found to be smaller in the gradient nano-grained structure than those of its homogeneous nano-grained structured counterparts, which indicates the influence of forward stress and back stress on dislocation motion near the zone boundary between the hard zone with smaller grains and the soft zone with larger grains, further verifying the presence of hetero-deformation induced hardening in the gradient nano-grained structure. |
| 分类号 | 二类 |
| WOS关键词 | SEVERE PLASTIC-DEFORMATION ; EQUIATOMIC CRCONI ; HIGH-STRENGTH ; STRAIN ; DUCTILITY ; STRESS ; MARTENSITE ; NI ; BEHAVIORS ; MAXIMUM |
| 资助项目 | NSFC Basic Science Center Program for Multiscale Problems in Non-linear Mechanics[11988102] ; National Natural Science Foundation of China[52192591] |
| WOS研究方向 | Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000918191600001 |
| 资助机构 | NSFC Basic Science Center Program for Multiscale Problems in Non-linear Mechanics ; National Natural Science Foundation of China |
| 其他责任者 | Wang, Wei |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/91549]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Tao, Yuhao,Cheng WQ,Wang W. Atomistic tensile deformation mechanisms in a CrCoNi medium-entropy alloy with gradient nano-grained structure at cryogenic temperature[J]. FRONTIERS IN MATERIALS,2023,9:8. |
| APA | Tao, Yuhao,程文强,&王为.(2023).Atomistic tensile deformation mechanisms in a CrCoNi medium-entropy alloy with gradient nano-grained structure at cryogenic temperature.FRONTIERS IN MATERIALS,9,8. |
| MLA | Tao, Yuhao,et al."Atomistic tensile deformation mechanisms in a CrCoNi medium-entropy alloy with gradient nano-grained structure at cryogenic temperature".FRONTIERS IN MATERIALS 9(2023):8. |
入库方式： OAI收割
来源：力学研究所
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