低Gd含量Mg-Gd-Y-Zr-Zn镁合金组织及性能  

Microstructure and properties of Mg-Gd-Y-Zr-Zn magnesium alloy with lower Gd content

作　　者：饶劲松[1] 薛寒松[1] 张丁非[1] 陈祖权[1] 邵兴洲[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《重庆大学学报（自然科学版）》2012年第8期22-25,33,共5页Journal of Chongqing University

基　　金：国家科技支撑计划资助项目(2011BAE22B01)

摘　　要：针对Mg-Gd系镁合金含Gd量高,导致成本及比重增加,文中采用溶剂保护熔炼法制备Mg-6Gd-3Y-0.4Zr-xZn(x=1,1.5,2)镁合金。经均匀化处理、热挤压及200℃时效处理制得试样,通过光学显微镜(OM)和扫描电子显微镜(SEM)等对合金组织、力学性能进行研究。结果表明,与固溶态相比,经过时效处理后析出的第二相更细小、分布更均匀;Mg-6Gd-3Y-0.4Zr-2Zn合金T5态的抗拉强度和屈服强度分别为403MPa和336MPa,延伸率为7.0%,达到或接近含Gd量较高的Mg-Gd-Y系镁合金的综合力学性能。Aiming at Mg-Gd magnesium alloy with higher Gd amount may lead to the increase of cost andspecific gravity, Mg-6Gd-3Y-0.4Zr-xZn alloys are prepared by solvent protection, Zn content is 1%. 1.5 %. 2 % respectively. The microstruetures and mechanical properties of alloys are studied by optical microscope （OM）and scanning electron microscope （SEM）, after solid solution treatment, hot extrusion and 200℃ aging treatment. The results show that after 200 ℃ aging treatment,the second phases in alloys have betterrefinement and distribution uniformity than those in solid solution state alloys, the tensile strength and yield strength of Mg-6Gd-3Y-0.4Zr-2Zn magnesium alloy is 403MPa and 336MPa,the elongation is 7.0%, the mechanical properties reached or approached those of Mg-Gd-Y magnesium alloy with higher Gd amount.

关 键 词：Mg-Gd-Y镁合金 时效 组织 力学性能 

分 类 号：TG223[金属学及工艺—铸造]