相图计算在Mg-9Gd-3Y-0.6Zn-0.5Zr新型变形镁合金热处理工艺设计中的应用  

Application of Calphad to Neotype Deforming Mg-9Gd-3Y-0.6Zn-0.5Zr Heat-treat Process Design

作　　者：赵娟[1] 李建平[1] 郭永春[1] 杨忠[1] 杨觉明[1] 梁民宪[1] 

机构地区：[1]西安工业大学材料与化工学院,陕西西安710032

出　　处：《铸造技术》2007年第4期531-534,共4页Foundry Technology

基　　金：国家重大基础研究发展规划资助项目(513300114A)

摘　　要：本文以相图热力学计算为基础,计算了Mg-9Gd-3Y-0.6Zn-0.5Zr新型合金的垂直截面图,并结合扎克哈罗夫经验公式和合金的DSC曲线分析设计了该合金的热处理工艺,并用CMT5105A型电子万能试验机和显微硬度仪测试了该合金的力学性能。结果表明:在计算所得的Mg-9Gd-3Y-0.6Zn-0.5Zr相图指导下制定的热处理工艺是正确的;挤压态Mg-9Gd-3Y-0.6Zn-0.5Zr合金的最佳热处理工艺为:200℃时效63 h,抗拉强度σb为=430 MPa,比挤压态提高了30.9%。On the basis of the calculation results of Phase DiagramThermodynamics, the neotype phase diagram of Mg-9Gd-3Y-0.6Zn-0.5Zr alloy of Mg-rich cornel was calculated using Calphad software Pandat and heat-treat process was designed combining with M. V. Zakharov empirical formula and DSC curve, as well as, mechanical property and microhardness of this alloy was tested using CMT5105A material test machine and Vickers micro-indenter. The result shows that the phase diagram of Mg-gGd-3Y-0.6Zn-0.5Zr is feasibility for the design of the heat treatment process in this alloy, the heat treatment process for as-extruded Mg-9Gd-3Y-0.6Zn-0.5Zr is aging at 200 13 for 63 h and σb=430 MPa, increased by 30.9 %.

关 键 词：稀土镁合金 相图计算 热处理工艺 Mg—Gd-Y DSC 

分 类 号：TG166[金属学及工艺—热处理]