铸态AZ80A镁合金的准超塑性  

Quasi-superplasticity for cast AZ80 Amagnesium alloy

作　　者：李更新[1] 

机构地区：[1]威海职业学院机电工程系,威海264210

出　　处：《塑性工程学报》2014年第5期133-138,共6页Journal of Plasticity Engineering

基　　金：河南省科技攻关资助项目(072102230007);西北工业大学凝固技术国家重点实验室开放课题资助项目(SKLSP201008)

摘　　要：通过铸态AZ80A镁合金的高温拉伸实验,得到了该合金在一定条件下具有较大的延伸率,最高达260%。在较大延伸率下,试样断口无明显颈缩、应变速率敏感性指数m值在0.3左右,从而判定其具有准超塑性。通过组织分析,断定铸态AZ80A镁合金的主要超塑性变形机理为动态再结晶。研究结果可对铸态镁合金的超塑性及其生产应用提供参考。The quasi-superplasticity of the cast AZ80A magnesium alloy was studied through high temperature tensile experi-ments . The results show that the cast AZ80A magnesium alloy has bigger elongation （as much as 260% ） under certain condi-tions .At the same time ,the broken specimens have no obvious necking constriction ,and its strain rate sensitivity index m is a-bout 0.3 .It is indicated that the cast AZ80A magnesium alloy has quasi-superplasticity through those results mentioned above . Via the microstructure analysis ,it can be concluded that the dynamic recrystallization is the major mechanism of the superplastic for the cast AZ80A magnesium alloy . This study provides some guidance in the superplasticity research of the magnesium alloys and their production applications .

关 键 词：铸态镁合金 准超塑性 高温拉伸实验 

分 类 号：TG376.2[金属学及工艺—金属压力加工]