La添加量对ZM5镁合金显微组织及力学性能的影响  

Effects of La Addition on Microstructure and Mechanical Properties of As-cast ZM5 Magnesium Alloys

作　　者：郭光平[1] 古文全[1] 吴健[1] 薛涛[1] 吴泽宏[1] 李英[1] 张翠翠[1] 

机构地区：[1]贵州省冶金化工研究所

出　　处：《特种铸造及有色合金》2017年第5期542-545,共4页Special Casting & Nonferrous Alloys

基　　金：贵州省科技基金资助项目(黔科合J字[2013]2200号)

摘　　要：研究了不同稀土La添加量对ZM5合金的铸态显微组织和室温力学性能的影响。结果表明,添加La能够使ZM5合金中的α-Mg晶粒组织细化,并形成稀土化合物Al_(11)La_3和Al_8LaMn_4。随La添加量的增加,沿晶界网状分布的β-Mg_(17)Al_(12)相逐渐转变为弥散分布。其中,La添加量为0.8%时铸态ZM5合金的室温力学性能最好,抗拉强度和伸长率分别为225 MPa和5.32%。Effects of La addition on microstructure and mechanical properties of the ZM5 were investigated.The results show that the grain sizes ofα-Mg phase can be greatly refined by La addition,and the Al11La3,Al8LaMn4 phases are precipitated from ZM5 contained La alloys.With the increase of the La addition,net-likeβ-Mg17Al12 at grain boundary is distributed dispersedly into the alloy.The ZM5＋0.8La alloy exhibits the desirable tensile properties,where the tensile strength and elongation reach 225 MPa and 5.32% at room temperature,respectively.

关 键 词：ZM5镁合金 LA 铸态显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG164.418[金属学及工艺—金属材料]