四川轻化工大学学报（自然科学版）2024，Vol.37Issue(2)：1-8,8.DOI:10.11863/j.suse.2024.02.01
高熵合金CoCrFeMnNi尺寸依赖性的纳米压痕模拟
Nanoindentation Simulation of the Size Dependence of the High-Entropy Alloy CoCrFeMnNi
摘要
Abstract
A molecular dynamics method is used to simulate the nanoindentation deformation process of CoCrFeMnNi high-entropy alloy.Aiming at the two factors of indenter size and indentation crystal orientation,the way of influencing the mechanical properties of this material and the corresponding microstructure evolution mechanism are investigated.The correctness of the simulation is verified by Hertzian curve fitting,and the results of the study show that as the size of the indenter increases from 3 nm to 6 nm,the material undergoes a plastic delay phenomenon and the hardness decreases with the change,decreasing by 9.78%,4.62%,and 12.97%along the three indentation directions[001],[110]and[111],respectively;both the dislocation length and the dislocation density show an overall increasing trend with increasing indenter size;but when the size of the indenter increases to a certain extent,the dislocation loop detachment phenomenon occurs during the indentation process along the grain direction[110],[111],resulting in no growth of dislocation density under individual working conditions.Overall,as the size of the indenter increases,there is an increase in the number of open slip systems in the CoCrFeMnNi high-entropy alloy material and an increase in plastic deformation.关键词
分子动力学/纳米压痕模拟/压头尺寸/硬度/位错Key words
molecular dynamics/nanoindentation simulation/indenter size/hardness/dislocation分类
数理科学引用本文复制引用
牛帅,张灿,师明星..高熵合金CoCrFeMnNi尺寸依赖性的纳米压痕模拟[J].四川轻化工大学学报（自然科学版）,2024,37(2):1-8,8.基金项目
国家自然科学基金项目(11472229) （11472229）
