Mg-Gd系合金等温锻造热成形特征及参数的研究  

Study on forming characteristics and parameters during isothermal forging simulation testing of a Mg-Gd alloy

作　　者：丁洁[1] 陈蕴博[1] 刘桂华[1] 张东博[1] 

机构地区：[1]机械科学研究总院,北京100083

出　　处：《材料热处理学报》2007年第6期33-36,共4页Transactions of Materials and Heat Treatment

基　　金：教育部博士点基金项目(2004079006)

摘　　要：研究新型变形镁稀土合金等温锻造热模拟过程中的力学行为及组织演变。初步确定该Mg-Gd系合金连续塑性变形过程中变形参数(变形温度、应变速率和变形量等)的范围。结果表明:较高的变形温度和较低的应变速率较易发生动态再结晶;该镁稀土合金的最佳成形条件范围约为:温度T>573K,且应变速率.ε<1s-1;典型变形参数为:623K,.ε=0.01s-1条件下,进行变形量为40%的压缩实验。该变形条件下可得到较为细小均匀的等轴晶粒组织,晶粒尺寸为30.1μm。Mechanical behavior and microstructure evolution of a Mg-Gd-Y-Zr alloy subjected to isothermal forging were studied. The deformation parameters of the alloy was found during progressive forming, deformation temperature, reduction and. strain rate included. The results show that the higher deforming temperature and the lower strain rate can promote the occurance of the dynamic recrystallization. The optimum deformation parameters for the Mg-Gd alloy is： T 〉 573K and ε^· 〈 1s^-1. Equiaxed fine grains with the size of 30. 1μm and homogeneous microstructure can be obtained for the alloy deformed with parameters of deformation temperature 623K, strain rate 0.01 s^-1 and reduction 40% .

关 键 词：稀土镁合金 变形镁合金 变形条件 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG316[金属学及工艺—金属材料]