文献类型：期刊文献

中文题名：纳米CoCrCuFeNi高熵合金原子尺度的实时变形行为

英文题名：Real-time atomic deformation behavior of nanoCoCrCuFeNi high-entropy alloy

作者：仝永刚[1];田楠[1];陈浩[2];张显程[2];胡永乐[1];吉希希[1];张明军[1];赵超杰[1]

机构：[1]长沙理工大学汽车与机械工程学院,长沙410114;[2]华东理工大学机械与动力工程学院,上海200237

年份：2023

卷号：33

期号：4

起止页码：1156

中文期刊名：Transactions of Nonferrous Metals Society of China

外文期刊名：中国有色金属学报（英文版）

收录：CSTPCD;;EI(收录号：20231814047986);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:001004443900001)】；CSCD:【CSCD2023_2024】；

基金：This work was supported by National Natural Science Foundation of China (Nos. 92166105, 52005053, 5180052032) , High -Tech Industry Science and Technology Innovation Leading Program of Hunan Province, China (No. 2020GK2085) , Hunan Youth Science and Technology Innovation Talent Project, China (No. 2021RC3096) , and Open Fund of Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education, China (No. 20KF-24) .

语种：中文

中文关键词：纳米高熵合金;错位演化;变形机制;应变速率;晶粒尺寸

外文关键词：nanocrystalline high-entropy alloy;dislocation evolution;deformation mechanism;strain rate;grain size

摘要：通过分子动力学方法分别在2×10^(8)~1×10^(10)s^(-1)的不同应变率和10~1200 K的不同温度下进行拉伸试验,并研究纳米CoCrCuFeNi高熵合金的实时变形行为。结果表明,在高温和低应变速率下的主要变形机制是晶界滑移。随着温度的降低和应变速率的增加,位错滑移取代晶界滑移来控制塑性变形,进而提高合金的强度。此外,为进一步研究晶界对力学行为的影响,对具有不同晶粒尺寸的合金进行模拟。结果发现,当晶粒尺寸过小时,纳米高熵合金的强度随着晶粒尺寸的增加而增加,表现出反Hall-Petch关系。
Tensile tests were performed by molecular dynamics at various strain rates ranging from 2×10^(8)to 1×10^(10)s^(-1)and various temperatures ranging from 10 to 1200 K,and the real-time deformation behavior of a nanocrystalline CoCrCuFeNi high-entropy alloy was investigated.The results indicate that the main deformation mechanism is grain boundary slip at high temperatures and low strain rates.Dislocation slip replaces grain boundary slip to control plastic deformation with decreasing temperature and increasing strain rate,correspondingly enhancing the strength of the alloy.Furthermore,the alloys with different grain sizes were simulated to evaluate the effects of grain boundaries on the mechanical behavior.It is found that the strength of the nanocrystalline high-entropy alloys increases with increasing grain sizes when the grain size is too small,exhibiting an inverse Hall?Petch relationship.