材料科学
位错
合金
微观结构
打滑(空气动力学)
应变硬化指数
氮气
硬化(计算)
变形机理
应变率
变形(气象学)
极限抗拉强度
复合材料
可塑性
冶金
热力学
化学
有机化学
物理
图层(电子)
作者
Yu Han,Huabing Li,Hao Feng,Yanzhong Tian,Zhouhua Jiang,Tao He
标识
DOI:10.1016/j.msea.2021.141235
摘要
In this study, the evolution of statistically stored dislocation (SSD) and geometrically necessary dislocation (GND) during tensile tests was investigated in CoCrFeMnNi high-entropy alloys (HEAs) with 0 and 0.52 at. % nitrogen. The microstructure characterization indicated that the plastic deformation of the alloys was dominated by dislocation slip below 20% true strain. Nitrogen alloying increased the total dislocation density and the strain-hardening rate during deformation, which could be explained by the interaction between nitrogen atoms and dislocations. The higher fraction of soft orientation zones for 0.52 N HEA was conducive for strain accommodation, resulting in a reduced GND density. Hence, SSDs contributed primarily to the increase of the total dislocation density and the higher strain-hardening rate of nitrogen-doped CoCrFeMnNi.
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