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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2020-07-02 多尺度材料力学研究组与与马普钢铁所安大勇博士、Zaefferer博士合作发表的论文“The combined and interactive effects of orientation, strain amplitude, cycle number, stacking fault energy and hydrogen doping on microstructure evolution of polycrystalline high-manganese steels under low-cycle fatigue”在期刊 International Journal of Plasticity 上在线发表。
Highlights
•Dislocation patterns of more than 1000 grains with defined loading conditions are observed by an integrated experimental approach combining DIC, EBSD and ECCI.
•Taylor factor is found to represent the crystallographic orientation information in polycrystalline materials more accurately than the commonly used loading direction parameter.
•The combined and interactive influences of crystallographic orientation, strain amplitude, cycle number, stacking fault energy and hydrogen doping on LCF behaviour of HMnSs are explored and discussed in detail.
Abstract
We studied the combined and interactive effects of crystallographic orientation, strain amplitude, cycle number, stacking fault energy (SFE) and hydrogen doping on the microstructure evolution of polycrystalline high-manganese steels (HMnSs) under low-cycle fatigue (LCF). An integrated experimental approach combining digital image correlation (DIC), electron backscatter diffraction (EBSD) and electron channelling contrast imaging (ECCI) at interrupted cycles was performed in the same region of interest on the bulk shear samples, which enables us to systematically compare the dislocation patterns of grains with defined loading conditions at a much larger field of view and less artefacts compared to transmission electron microscopy (TEM). We found that Taylor factor (M) works well with describing the effect of crystallographic orientation, which was further proved by the crystal plasticity finite element method (CPFEM). In detail, grains with a medium M value
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