| An atomistic study on grain-size and temperature effects on mechanical properties of polycrystal CoCrFeNi high-entropy alloys | |
| Xie, Lu; Wu, Guangda; Peng Q(彭庆); Liu, Junpeng; Li, Dongyue; Wang, Wenrui | |
| Corresponding Author | Peng, Qing([email protected]) ; Wang, Wenrui([email protected]) |
| Source Publication | MATERIALS TODAY COMMUNICATIONS
 |
| 2023-12-01 | |
| Volume | 37Pages:11 |
| Abstract | The origin of the outstanding mechanical properties of high-entropy alloys (HEAs) is still elusive. In this paper, we have investigated the influence of grain size and temperature on the mechanical properties of polycrystalline CoCrFeNi HEAs via molecular dynamics simulations. The critical grain size for the inverse Hall-Petch effect in CoCrFeNi HEAs is approximately 11.65 nm. During the stage of the positive Hall-Petch effect (where smaller grain sizes lead to higher tensile strength), there is a positive correlation between the tensile strength and dislocation density in CoCrFeNi HEAs. The higher tensile strength at low temperatures in CoCrFeNi HEAs is also attributed to an increase in dislocation density. At low temperatures, the reduced thermal vibrations of atoms slow down the motion of dislocations, leading to an increased storage time of dislocations within the crystal. In the stage of the inverse Hall-Petch effect, due to a significant reduction in grain size, the storage capacity of dislocations within grains decreases. This leads to the accumulation of more dislocations at grain boundaries, forming defects, and consequently causing a decrease in the tensile strength of CoCrFeNi HEAs as the grain size decreases. Our results might be helpful in material design of polycrystal HEAs. |
| Keyword | High-entropy alloys Grain size Temperature Twinning Phase transition |
| DOI | 10.1016/j.mtcomm.2023.107264 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001109710400001 |
| WOS Keyword | DEFORMATION ; TRANSFORMATION ; DEPENDENCE ; TOUGHNESS ; BOUNDARY ; BEHAVIOR |
| WOS Research Area | Materials Science |
| WOS Subject | Materials Science, Multidisciplinary |
| Funding Project | National Natural Science Foundation of China[12272378] ; LiYing Program of the Institute of Mechanics, Chinese Academy of Sciences[E1Z1011001] |
| Funding Organization | National Natural Science Foundation of China ; LiYing Program of the Institute of Mechanics, Chinese Academy of Sciences |
| Classification | 二类 |
| Ranking | 1 |
| Contributor | Peng, Qing ; Wang, Wenrui |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/93594 |
| Collection | 非线性力学国家重点实验室 |
| Recommended Citation GB/T 7714 | Xie, Lu,Wu, Guangda,Peng Q,et al. An atomistic study on grain-size and temperature effects on mechanical properties of polycrystal CoCrFeNi high-entropy alloys[J]. MATERIALS TODAY COMMUNICATIONS,2023,37:11.Rp_Au:Peng, Qing, Wang, Wenrui |
| APA | Xie, Lu,Wu, Guangda,彭庆,Liu, Junpeng,Li, Dongyue,&Wang, Wenrui.(2023).An atomistic study on grain-size and temperature effects on mechanical properties of polycrystal CoCrFeNi high-entropy alloys.MATERIALS TODAY COMMUNICATIONS,37,11. |
| MLA | Xie, Lu,et al."An atomistic study on grain-size and temperature effects on mechanical properties of polycrystal CoCrFeNi high-entropy alloys".MATERIALS TODAY COMMUNICATIONS 37(2023):11. |
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| Jp2023Fa222.pdf（18987KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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