AZ31B镁合金拉伸应力-应变和再结晶组织  

Stress-Strain of Uniaxial Tension and Recrystallization Structures of AZ31B Magnesium Alloy

作　　者：张青来[1] 胡永学[1] 王粒粒[1] 

机构地区：[1]江苏大学,江苏镇江212013

出　　处：《稀有金属材料与工程》2008年第4期678-681,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50774037);江苏大学项目(05JDG09)

摘　　要：通过单向热拉伸试验和金相显微组织观察研究了AZ31B薄板热变形过程及变形前后的再结晶组织。结果表明：160～400℃的热拉伸应力－应变曲线具有3个特征温度区间，且明显区别于室温的应力－应变曲线。薄板制备方式和退火制度对应力峰值有较大影响。在160～200℃热变形中，发生了不完全静态和动态再结晶。最佳热变形参数为：变形温度为260～320℃，变形前静态再结晶时间为12～18min，应变速率为1×10^-3s^-1。此时延伸率δ达92％～137％，可获得均匀分布的细小等轴动态再结晶组织。The thermal deformation process and dynamic recrystallization microstructure of AZ31B magnesium alloy were investigated by uniaxial thermal tension and observation of metallographic microstructure. The results show that there are three special temperature ranges on the stress-strain curves of thermal tensile at 160-400℃, which is different from curves at room temperature apparently. The process of preparation and anneal for thin sheet have great effect on the stress peak value. Non-full static and dynamic recrystallization was occurred for the thermal deformation at 160-200 ℃. The optimum thermal deformation parameters are follows：deformation temperatures of 260-320 ℃, duration of static recrystallization of 12-18 min and strain rates of 1 × 10^-3s^-l, respectively, by which the tensile elongations δ= 92%-137%, evenly-distributed and refined equal axial grains structure could be obtained.

关 键 词：镁合金 再结晶 热拉伸 微观组织 

分 类 号：TG146.22[一般工业技术—材料科学与工程]