等通道转角挤压处理的镁合金AZ31的低周疲劳行为  

Low cycle fatigue behavior of a magnesium alloy AZ31 processed by equal-channel-angular-pressing

作　　者：尹树明[1] 赵述哲[1] 成泰民[1] 

机构地区：[1]沈阳化工大学,辽宁沈阳110142

出　　处：《轻金属》2011年第8期55-58,共4页Light Metals

基　　金：国家自然科学基金(批准号:10647138);辽宁省教育厅科学研究项目((批准号:20060667)资助的课题

摘　　要：研究了一道次等通道转角挤压(ECAP)处理的镁合金AZ31挤压棒材的低周疲劳行为,结果表明:在塑性应变幅为0.5%时,材料表现出显著地循环软化;而在应变幅不大于0.2%时,基本表现为循环稳定或微弱的循环软化。疲劳裂纹主要萌生于细晶区,并沿着细晶区扩展,并导致最终的断裂。In this paper,low cycle fatigue properties of one pass equal channel angular pressed（ECAP） magnesium alloy AZ31 have been investigated.It shows that the material exhibits cyclic softening drastically at plastic strain amplitude of 0.5%,while exhibits cyclic softening slightly or cyclic stable at strain amplitudes no more than 0.2%.Fatigue crack initiated at fine-grained zones and propagated along the fine-grained zones which resulted in final fracture.

关 键 词：镁合金 等通道转角挤压(ECAP) 低周疲劳 

分 类 号：TG379[金属学及工艺—金属压力加工]