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An atomistic study on grain-size and temperature effects on mechanical properties of polycrystal CoCrFeNi high-entropy alloys

文献类型：期刊论文

作者Xie, Lu; Wu, Guangda; Peng Q(彭庆); Liu, Junpeng; Li, Dongyue; Wang, Wenrui
刊名MATERIALS TODAY COMMUNICATIONS
出版日期2023-12-01
卷号37页码:11
关键词High-entropy alloys Grain size Temperature Twinning Phase transition
DOI10.1016/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.
分类号二类
WOS关键词DEFORMATION ; TRANSFORMATION ; DEPENDENCE ; TOUGHNESS ; BOUNDARY ; BEHAVIOR
资助项目National Natural Science Foundation of China[12272378] ; LiYing Program of the Institute of Mechanics, Chinese Academy of Sciences[E1Z1011001]
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
其他责任者Peng, Qing ; Wang, Wenrui
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
推荐引用方式
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.
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.

入库方式： OAI收割

来源：力学研究所

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