非对称/对称轧制AZ31镁合金微观组织研究  

Microstructure of AZ31 Magnesium Alloy Sheets During Asymmetric/Symmetric Rolling Procedure

作　　者：张文玉[1] 刘先兰[1] 陈振华[2] 夏伟军[2] 

机构地区：[1]湖南工学院机械工程系,湖南衡阳421002 [2]湖南大学材料科学与工程学院,长沙410082

出　　处：《材料工程》2008年第6期25-28,共4页Journal of Materials Engineering

基　　金：湖南省自然科学基金资助项目(07JJ3092);湖南省教育厅资助科研项目(06c031);湖南省科技计划项目(2007FJ3095)

摘　　要：研究了非对称轧制和对称轧制过程中,AZ31镁合金板材微观组织的变化特征,并结合有限元模拟对其差异进行了分析。结果表明,非对称轧制可明显细化板材的晶粒,可获得平均晶粒度约为8.9μm均匀分布的等轴晶组织,且其(0002)基面晶粒取向明显减弱;而对称轧制板材晶粒分布不均匀且有大量的孪晶存在,平均晶粒度达13.2μm。这主要是因为,与对称轧制相比,非对称轧制沿板材厚向引入了强烈的剪切应变所致。The objective of this study is to investigate the evolvement of microstructure in AZ31 magnesium alloy sheets produced by asymmetric and symmetric rolling, which was analyzed by finite element method. The results indicated that the grain of AZ31 magnesium alloy sheets produced by asymmetric rolling was homogenous, which average grain size was 8.96μm. While, the average grain size for the sheets produced by symmetric rolling was about 13.2μm. Compared with that of the sheets produced by symmetric rolling, （0002） basal grain orientation of AZ31 magnesium alloy sheets produced by asymmetric rolling was obviously weakened. These could be owing to the intensive shear deformation induced by asymmetric rolling.

关 键 词：非对称轧制 对称轧制 AZ31镁合金板材 微观组织 有限元 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG339[金属学及工艺—金属材料]