加工工艺对AZ61镁合金拉压不对称性的影响  

Effect of Machining Techniques on Tension-compression Yield Asymmetry of AZ61Magnesium Alloy

作　　者：汪清[1] 王敬丰[1] 黄崧[1] 李琳俊楠 耿铁[2] 潘复生[1] 

机构地区：[1]重庆大学国家镁合金材料工程技术研究中心,重庆400044 [2]河南工业大学机电工程学院,郑州450007

出　　处：《材料工程》2013年第11期57-61,88,共6页Journal of Materials Engineering

基　　金：国家科技支撑计划课题(2011BAE22B04);新世纪优秀人才支持计划资助(NCET-11-0554)

摘　　要：采用一次挤压变形、二次挤压变形以及一次挤压后再进行锻造的三种加工工艺对AZ61镁合金进行塑性变形,研究不同的加工工艺对镁合金力学性能及拉压不对称性的影响。结果表明:挤压变形可以细化AZ61镁合金的晶粒,而在挤压后进行锻造变形,会使得其晶粒长大粗化。二次挤压后,由于强化了{0002}基面织构,AZ61镁合金的拉伸屈服强度增加,压缩屈服强度下降,使得拉压不对称性加大。而一次挤压后锻造,在挤压基面织构状态得到改变,且由于晶粒粗大,从而总体上使得AZ61镁合金的拉伸屈服强度下降,而压缩屈服强度几乎保持不变,AZ61的拉压不对称性得到改善。Three kinds of machining techniques including one pass extrusion, two passes extrusion and forging after extrusion were adopted to deform AZ61 magnesium alloy, then mechanical property, tension and compression yield asymmetry were studied. The results indicate that, extrusion can refine the grain size of AZ61 magnesium alloy, but the grain is coarse by forging after extrusion. Due to {0002} basal plane orientation strengthened by two passes extrusion, tensile yield strength increases while compressive yield strength decreases, which deteriorate the tension and compression asymme- try. After forging deformation,altering the basal plane texture, while coarsening the grains partly at the same time, tensile yield strength of AZ61 magnesium alloy dropped, while compressive yield strength keep almost the same. As a result, tension and compression yield asymmetry was improved.

关 键 词：镁合金 挤压 锻造 不对称性 

分 类 号：TG146.22[一般工业技术—材料科学与工程]