原位背散射电子衍射研究压缩变形过程中AZ31合金的微观组织演变

摘要

本文采用原位背散射电子衍射(原位-EBSD)方法研究了AZ31合金在压缩应力下的微观组织演变.结果表明{ 10-12}[-1011]孪生是主要的变形模式.该孪生模式导致了变形后晶体取向发生了明显的转变,由原始取向为其C轴垂直于挤压方向ED的丝织构,转变为其C轴平行于ED及压缩应力方向.同时位错滑移也提供了一定的变形量.AZ31合金中RD和TD织构组分的梯度对于压缩变形条件下的孪生变形没有明显的影响.%The microstructure evolution of extruded AZ31 alloy tube under compression was studied by in-situ electron backscatter diffraction (in-situ EBSD) . Extension twining, {10 -12 }[-1011] was the main deformation mode in the tube under compression, which leaded to the texture changing from initial basal ring fiber, [0001] perpendicular to compression direction (CD) , to [0001]//CD. The texture gradient on radial direction (RD) and tangential direction (TD) had weak effect on the twining mode.