An atomistic study on grain-size and temperature effects on mechanical properties of polycrystal CoCrFeNi high-entropy alloys | |
Xie, Lu4; Wu, Guangda4; Peng, Qing1,3; Liu, Junpeng2; Li, Dongyue4; Wang, Wenrui4 | |
刊名 | MATERIALS TODAY COMMUNICATIONS |
2023-12-01 | |
卷号 | 37页码:11 |
关键词 | High-entropy alloys Grain size Temperature Twinning Phase transition |
DOI | 10.1016/j.mtcomm.2023.107264 |
通讯作者 | Peng, Qing(pengqing@imech.ac.cn) ; Wang, Wenrui(gmbitwrw@ustb.edu.cn) |
英文摘要 | 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. |
资助项目 | National Natural Science Foundation of China[12272378] ; LiYing Program of the Institute of Mechanics, Chinese Academy of Sciences[E1Z1011001] |
WOS关键词 | DEFORMATION ; TRANSFORMATION ; DEPENDENCE ; TOUGHNESS ; BOUNDARY ; BEHAVIOR |
WOS研究方向 | Materials Science |
语种 | 英语 |
WOS记录号 | WOS:001109710400001 |
资助机构 | National Natural Science Foundation of China ; LiYing Program of the Institute of Mechanics, Chinese Academy of Sciences |
内容类型 | 期刊论文 |
源URL | [http://dspace.imech.ac.cn/handle/311007/93593] |
专题 | 力学研究所_非线性力学国家重点实验室 |
通讯作者 | Peng, Qing; Wang, Wenrui |
作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat, Minist Educ, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 4.Univ Sci & Technol Beijing, Sch Mech Engn, Beijing 100083, Peoples R China |
推荐引用方式 GB/T 7714 | Xie, Lu,Wu, Guangda,Peng, Qing,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. |
APA | Xie, Lu,Wu, Guangda,Peng, Qing,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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