摘要
对挤压轧制薄板过程中AZ31镁合金的显微组织和晶粒取向差的变化进行了试验研究。结果表明:AZ31镁合金铸锭经挤压后,中部和边部晶粒尺寸相差很大,小角度晶界较少,中部和边部的晶粒取向差分布出现较大区别,但没有孪晶出现;经轧制后,出现了孪晶,且随着变形量的增大,孪晶数量增加,小角度晶界增多,中部和边部晶粒尺寸差距逐渐减小;退火后,孪晶等变形组织消失,形成均匀细小的等轴晶,小角度晶界减少,中部和边部晶粒取向差都在30°附近。
The microstructure and grain misorientation of the AZ31 magnesium alloy sheet during extrusion and rolling were investigated. The results show that the size and misorientation distribution of the middle and marginal grains of the extruded AZ31 magnesium alloy cast ingot had a great disparity. Small angle grain boundaries and no twin were found after extrusion. After rolling, both the twins and small angle grain boundaries were observed and increased with the increase of the reduction. The misorientation decreased gradually with the increase of the reduction. The deformed structure including twins disappeared after annealing and homogenous fine equiaxed grains were formed. Small angle boundaries reduced after annealing, and the grain misorientation distributed at nearly 30 degrees.
出处
《机械工程材料》
CAS
CSCD
北大核心
2010年第8期26-29,35,共5页
Materials For Mechanical Engineering
基金
国家重点基础研究"973"发展计划资助项目(2007CB613703)
科技部中法镁合金国际合作重点项目(2006DFA51160)
