微纳米压入测试过程中高熵合金弹性变形对几何必须位错密度的影响  

Effect of Elastic Deformation of High⁃Entropy Alloy on Geometrically Necessary Dislocation Density in Micro⁃and Nano⁃indentation Test

作　　者：周建军 陈杰 王艺[3] ZHOU Jianjun;CHEN Jie;WANG Yi(Tangshan Guye District Vocational and Technical Education Center School,Tangshan 063100,Hebei,China;Anyang Vocational and Technical College,Anyang 455000,Henan,China;Civil Aviation Flight University of China,Guanghan 618300,Sichuan,China)

机构地区：[1]唐山市古冶区职业技术教育中心学校,河北唐山063100 [2]安阳职业技术学院,河南安阳455000 [3]中国民用航空飞行学院,四川广汉618300

出　　处：《矿冶工程》2023年第4期139-143,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金青年基金(12104502)。

摘　　要：通过微纳米压入法对CoCrFeNiMn高熵合金进行压入测试,得到不同工况下几何必须位错密度与实时压入深度倒数1/h的关系,并探究了弹性因子(Δe)对几何必须位错密度的影响。结果表明,考虑弹性变形影响的几何必须位错密度(ρGe)与1/h呈现出非线性关系;忽略弹性变形影响的几何必须位错密度(ρG)与1/h呈现出线性关系;对比ρG/ρGe随压入深度的变化,发现存在尺度效应:压入深度小于500 nm时,ρG/ρGe比值为3~4,说明弹性因子在浅压痕处对几何必须位错密度影响明显;压入深度达3000 nm时,ρG/ρGe比值接近1;随着压入深度增加,位错滑移逐渐占据主导地位。A micro⁃and nano⁃indentation test was performed for CoCrFeNiMn high entropy alloy.The relationship between the geometrically necessary dislocation(GND)density of CoCrFeNiMn and reciprocal value of real indentation depth(1/h)was obtained under different working conditions,and the influence of elastic factor(Δe)on GND density was also explored.The results show that GND density with the consideration of elastic deformation(ρGe)presents a nonlinear relationship with 1/h,while GND density without the consideration of influence of elastic deformation(ρG)has a linear relation with 1/h.Based on the comparison of variation ofρG/ρGe with the indentation depth,it is found that the ratio ofρG/ρGe is 3-4 when the indentation depth is less than 500 nm,indicating that elastic factor can have an obvious impact on the GND density at shallow indentation.And,the ratio ofρG/ρGe is approaching 1 when the indentation depth is up to 3000 nm.It is shown that as indentation depth increases,dislocation slip gradually dominates deformation.

关 键 词：高熵合金 微纳米压入 几何必须位错 弹性因子 弹性变形 位错密度 

分 类 号：TB302[一般工业技术—材料科学与工程]