Mg-5Sn-2.5Pb镁合金的热变形行为及加工图  

Hot deformation behavior and processing map of Mg-5Sn-2.5Pb magnesium alloy

作　　者：朱云鹏[1] 解品 金培鹏[1] 

机构地区：[1]青海大学青海省新型轻合金重点实验室青海省轻金属合金及深加工工程技术研究中心,青海西宁810016

出　　处：《材料热处理学报》2017年第6期195-200,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51661028);青海省科技项目(2014-GX-203)

摘　　要：采用Gleeble-3500热模拟试验机研究Mg-5Sn-2.5Pb镁合金在变形温度250~450℃、应变速率为0.001~10 s^(-1)条件下的热压缩变形行为,并基于动态材料模型(DMM)建立了Mg-5Sn-2.5Pb镁合金在应变为0.6时的热加工图。结果表明,Mg-5Sn-2.5Pb镁合金的高温流变应力对应变速率和温度的变化敏感,随变形温度的降低和应变速率的增大而增大;Mg-5Sn-2.5Pb镁合金的最佳加工区域:变形温度为375~450℃、应变速率为0.01~0.3 s^(-1)。在此区域Mg-5Sn-2.5Pb镁合金的显微组织为动态再结晶组织。Compressive deformation behavior of Mg-5Sn-2.5Pb magnesium alloy was investigated at the temperature range from 250 to 450 ℃ and strain rate range from 0. 001 to 10 s^-1 on a Gleeble-3500 thermal simulator. The processing map of the alloy at a strain of 0. 6 was established based on dynamic materials model （DMM）. The results show that the flow stress of the alloy is sensitive to strain rate and temperature, the flow stress increases with decreasing the deformation temperature and increasing the strain rate. The optimum hot working parameters for the magnesium alloy are deformation temperature of 370-450 ℃ and strain rates of 0. 01-0.3 s^-1 , and the dynamically reerystallized homogeneous microstructure of the alloy is obtained.

关 键 词：Mg-5Sn-2.5Pb镁合金 热压缩 本构方程 热加工图 显微组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]