机械振动对Mg-6Gd-3Y-0.4Zr-2Zn镁合金组织和性能的影响  

Influence of Mechanical Vibration on Microstructure and Mechanical Properties of Mg-6Gd-3Y-0.4Zr-2Zn Magnesium Alloys

作　　者：薛寒松[1] 吴招兵[1] 彭开建[1] 向军军[1] 张丁非[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《铸造》2013年第9期870-873,共4页Foundry

基　　金：国家科技支撑计划项目(2011BAE22B01)

摘　　要：通过金相组织分析、X射线衍射分析、扫描电镜分析和力学性能测试,研究了机械振动对Mg-6Gd-3Y-0.4Zr-2Zn镁合金显微组织和力学性能的影响。试验结果表明,在镁合金凝固过程中施加机械振动,导致最初形成的枝晶破碎,形成游离晶核,游离晶核作为异质形核质点增加了晶核的数目,有效地细化了合金组织,铸造缺陷也明显地得到了改善。机械振动使合金的力学性能得到显著提高,合金的最大抗拉强度和屈服强度分别提高了17.3%和15.4%,伸长率也得到一定的提高。Microstructure and mechanical properties of Mg-6Gd-3Y-0.4Zr-2Zn magnesium alloys with mechanical vibration were investigated by OM,XRD,SEM and tensile testing respectively.The results show that the initial dendrite was broken in the solidification process of magnesium alloy with mechanical vibration,then formed free crystal nucleus,which acted as heterogeneous nucleation core and increased the number of crystal nucleus.The microstructure was refined effectively,and the casting defects were improved obviously.Mechanical vibration can significantly improve the mechanical properties of the alloy.The maximum tensile strength and yield strength increased by 17.3％ and 15.4％ respectively,and elongation ratio can also improved at certain degree.

关 键 词：机械振动 晶粒细化 显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]