等径角轧制AZ31镁合金板材流变行为研究  

Rheological Behavior of AZ31 Magnesium Alloy Sheet Prepared by Equal Channel Angular Rolling

作　　者：罗衡[1] 陈振华[1] 夏伟军[1] 陈鼎[1] 严红革[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《矿冶工程》2008年第5期103-106,共4页Mining and Metallurgical Engineering

基　　金：国家自然科学基金项目(50674043)

摘　　要：通过室温单向拉伸实验,研究了AZ31镁合金板材的塑性变形机理。经等径角轧制,轧制板材轧制方向塑性性能明显优于横向性能,延伸率由17.5%提高到28.6%。普通轧制板材呈强烈的(0002)基面取向,等径角轧制后,板材晶粒取向由原来的(0002)基面取向转变为非基面取向;普通轧制板材拉伸断裂后存在大量孪晶,等径角轧制板材沿轧制方向拉伸孪晶数量明显减少,等径角轧制有可能启动了新的滑移系,而拉伸孪生只是作为一种协调变形机制。The plastic strain mechanism of AZ31 magnesium alloy sheet was investigated by room-temperature uniaxial tensile test. After equal channel angular rolling（ ECAR）, the plasticity of the roiled sheet along the rolling direction was obviously better than along the transverse direction. The elongation rate increased from 17.5% to 28.6%. The conven- tionally processed sheet showed a distinct （0002） basal plane orientation. However, the grain orientation of the sheet processed by equal channel angular rolling evolved from （0002） basal plane to non-basal plane. After being subjected to tensile failure, the conventionally rolled sheet had a lot of twin crystals, while the sheet processed by ECAR had much reduced twin crystals. A new sliding system may be started by ECAR, while the tension twinning acted as compatible deformation mechanism.

关 键 词：AZ31镁合金板材 等径角轧制 流变曲线 微观组织 晶粒取向 

分 类 号：TG146.2[一般工业技术—材料科学与工程]