Mg-11.8Gd-2.8Y-0.44Zr耐热镁合金热压缩变形行为研究  

Hot Compression Deformation Behavior of Mg-11.8Gd-2.8Y-0.44Zr Magnesium Alloy

作　　者：董丽君[1] 吴安如[1] 王克龙[1] 贺佳[1] 蒋斌[1] 

机构地区：[1]湖南工程学院机械工程学院

出　　处：《特种铸造及有色合金》2010年第10期955-957,共3页Special Casting & Nonferrous Alloys

基　　金：湖南省教育厅重点资助科研项目(08A010);湖南省大学生研究性学习和创新性实验计划资助项目(2009320)

摘　　要：采用Gleeble-1500热/力模拟机,对Mg-11.8Gd-2.8Y-0.44Zr耐热镁合金在温度为573～723K,应变速率为0.001、0.010、0.100s-1,应变量为60%的塑性变形行为以及热压缩后镁合金组织的变化进行了研究。分析了流变应力与应变速率和温度的关系。结果表明,合金的稳态流变应力随应变速率的增大而增大,在恒应变速率条件下,合金的真应力水平随温度的升高而降低,根据试验分析,合金的热加工宜在623K时进行。The compression deformation of Mg-11.8Gd2.8Y-0.44Zr magnesium alloy and its microstructure were investigated on the Gleeble-1500Dhot simulator with strain rate of 0.001s-1～0.1s-1 at 300～450℃in condition of the 60%deformation rate.The relationship between flow stress and deformation temperature was analyzed.The results reveal that the steady flow stress is increased with the increase of strain rate,while the true stress is decreased with increasing in deformation temperature at a constant strain rate.Temperature about 350℃is suggested for hot deformation of the alloy.

关 键 词：MG-GD-Y-ZR镁合金 热压缩变形 流变应力 

分 类 号：TG146.22[一般工业技术—材料科学与工程]