个人信息Personal Information
学历：博士研究生毕业
学位：工学博士学位
性别：男
学科：力学. 航空宇航科学与技术. 材料科学与工程. 机械工程. 冶金工程. 先进制造. 航空工程. 材料工程. 冶金工程. 机械工程. 固体力学
多尺度与微纳米力学，梯度结构材料，界面力学，固体本构关系，应变梯度理论，晶体塑性有限元，离散位错动力学，分子动力学，高熵合金，大数据与机器学习，材料基因，极端力学，高性能材料
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2019-07-11 合作发表的论文Effects of alloying on deformation twinning in high entropy alloys在期刊 Materials Science and Engineering: A 上在线发表。
Abstract
In the current work, molecular dynamics (MD) simulations were employed to model the compressive property of FCC (face centered cubic) Al0.25CoFeNiCu0.75 high entropy alloy (HEA) nanopillars. For comparison the binary, ternary and quaternary derivatives based on Ni–Cu–Fe–Co–Al system along with pure Ni were investigated. The twin nucleation and migration stress, atomic strain and stress and generalized planar faults energy (GPFE) of the compositions were calculated. The simulation results suggest that plastic deformation of all nanopillars is mediated by deformation twinning, but both the yield strength and flow stress decrease with the increase in the number of alloying elements, implying the decrease in the twin nucleation and migration stresses, respectively. The atomic strain and stress, increasing with the addition of alloying elements, provide direct evidences at atomic scale for the severe lattice distortion resulting in the decrease in stacking fault energy (SFE) and twin boundary energy as shown in the GPFE curves. The SFE of Al0.25CoFeNiCu0.75 HEA is 16mJ/m2. The twinnability of the studied compositions also increases with the addition of alloying elements, so twinning deformation dominates in the current nanocrystals.
Link
https://doi.org/10.1016/j.msea.2019.138143