Mg-Li合金等角挤压实验及有限元分析

Finite element analysis and experimental research on Mg-Li alloy treated by equal channel angular extrusion

对等通道转角挤压Mg-Li合金进行了有限元分析和实验研究。模拟结果表明:随着挤压速度或摩擦的增大,试样整体变形越来越不均匀。实验结果表明:随着挤压速度的增大且无润滑的情况下,试样沿轴线方向出现了与剪切平面相平行的鱼鳞状裂纹;在挤压速度较低且胶体石墨润滑的情况下,试样表面光滑,无裂纹产生;经ECAE一道次挤压,实验合金中α相的晶粒大小由20μm左右变为10μm左右。

Equal channel angular extrusion of Mg-Li alloy was investigated by finite element method and experiment method. The simulation result shows that deformation of the whole sample is heterogeneous when the extruding speed or the friction coefficient becomes larger gradually. Experimental result shows that increasing the extruding speed without lubricant, the shape of surface crack of fish scale type is found along the axial direction paralleled to the shear plane. The surface of sample lubricated with colloidal graphite is smooth and no crack appeared. The grain size of a phase in the Mg-Li alloy is reduced to 10μm from 20μm.