AZ31B镁合金轧制板材室温动态拉伸的SEM观察  

In situ SEM study of dynamic tensile in wrought magnesium alloy AZ31B rolling sheet

作　　者：魏松波[1] 蔡庆伍[1] 唐荻[1] 孟强[1] 李振[1] 

机构地区：[1]北京科技大学高效轧制国家工程研究中心,北京100083

出　　处：《塑性工程学报》2009年第3期155-160,共6页Journal of Plasticity Engineering

基　　金：国家"十一五"科技支撑计划重点项目"镁及镁合金关键技术开发与应用"子课题"变形镁合金板材加工技术研究"(2006BAE04B02)

摘　　要：利用动态拉伸台和扫描电镜(SEM)对AZ31B镁合金轧制板材进行了动态拉伸的微观形貌观察。试验证明,材料宏观织构和显微组织都会对镁合金轧制板材的室温拉伸性能产生影响;在轧制镁合金拉伸变形时滑移和孪生同时存在;裂纹的产生和扩展具有明显的方向性。轧制组织中大量的变形孪晶与应力方向的位向关系,是轧向和横向上裂纹产生及扩展机制产生较大差异的主要原因。Tension fracture process of a rolled AZ31B magnesium alloy is investigated by means of dynamic tensile tests and Scanning Electronic Microscope （SEM） observation. The results concerning the microcrack generation, propagation and abruption of the specimen displayed that both texture and microstructure have influence to the tensile property of the rolled Mg alloy sheet at room temperature. Both plastic slip and twinning occur during the tensile process. The difference between twinning orientation and the tension direction in rolled sheet will account for the variance in crack generation and expansion at the roiling direction and transverse direction.

关 键 词：AZ31B镁合金 轧制 动态拉伸 微观组织 扫描电镜 

分 类 号：TG146.22[一般工业技术—材料科学与工程]