摘要
采用分离式Hopkinson压杆和反射式拉杆装置在室温对挤压态AZ31B镁合金进行了动态压缩和拉伸试验,分析了AZ31B镁合金沿挤压方向压缩和拉伸时的不对称性和应变速率敏感性。结果表明:沿挤压方向压缩时,拉伸孪晶{102}<1120>首先启动,屈服强度对应变速率不敏感;沿挤压方向拉伸时,拉伸孪晶不能启动,位错滑移参与变形,应变速率敏感性有所提高;由于拉伸孪晶只能单向启动,AZ31B镁合金在挤压方向的动态拉压不对称性显著。
Dynamic compression and tension tests of extruded AZ31B magnesium alloy were carried out using a split Hopkinson pressure bar and a reflected hopkinson tension bar apparatus at room temperature.Tension-compression asymmetry and strain rate sensitivity of AZ31B magnesium alloy were analyzed when tested along extruding direction.The results show that when the alloy is compressed along extruding direction,{102}1120 tension twining is initiated first,resulting that the yield stress of the alloy is insensitive to strain rate.When the alloy is tested in tension along extruding direction,{102}1120 tension twining is not initiated,but dislocation slip is responsible for the plastic deformation,resulting that strain rate sensitivity grows.Because of the polarity of tension twining,the tension-compression asymmetry of AZ31B magnesium alloy is much pronounced when tested along extruding direction.
出处
《热加工工艺》
CSCD
北大核心
2011年第12期19-21,24,共4页
Hot Working Technology
基金
国家重点基础研究发展计划资助项目(2007CB613705)
关键词
镁合金
孪生
织构
应变速率敏感性
magnesium alloy
twining
texture
strain rate sensitivity
作者简介
王长义（1969-），男，辽宁铁岭人，副教授，博士研究生，主要研究方向为高品质镁合金及其应用：电话：024—88045045；E-mail：cywang1969@163．com
