合金元素对Mg-Er-Zn-Zr合金铸态组织和力学性能的影响  

Effects of Alloying Elements on Microstructures and Mechanical Properties of Alloys Mg-Er-Zn-Zr

作　　者：李志宏[1] 李克志[2] 张晋涛[1] 张俊峰[1] 

机构地区：[1]四川工程职业技术学院材料工程系,四川德阳618000 [2]枣庄科技职业学院机械工程系,山东滕州277500

出　　处：《铸造技术》2015年第12期2843-2845,共3页Foundry Technology

摘　　要：研究了合金元素Zn和Zr对Mg-Er-Zn-Zr合金铸态组织和力学性能的影响。结果表明,(Mg_(97.5)Er_2Zn_(0.5))_(99.82)Zr_(0.18)、Mg_(97)Er_2Zn_1和(Mg_(97)Er_2Zn_1)_(99.82)Zr_(0.18)合金都呈现典型的树枝晶结构。由于Zn元素的增加,(Mg_(97)Er_2Zn_1)_(99.82)Zr_(0.18)比(Mg_(97.5)Er_2Zn_(0.5))_(99.82)Zr_(0.18)的组织明显细化,二次枝晶臂的间距减小,第二相由非连续网状分布变成了片层状分布。Zr元素的添加使得合金晶粒细化,第二相呈现更加弥散分布,第二相组成没有发生变化,依然由X-Mg_(12)Er_1Zn_1相和(Mg,Zn)x Er相组成。随着Zn元素和Zr元素含量的增加,合金的力学性能明显提高。The effects of the alloying elements Zn and Zr on the microstructures and mechanical properties of alloy Mg-Er-Zn-Zr were investigated. The results show that the alloys（Mg_（97.5）Er_2Zn_（0.5））_（99.82）Zr_（0.18）、Mg_（97）Er_2Zn_1and（Mg_（97）Er_2Zn_1）_（99.82）Zr_（0.18） present typical dendrite structures. The microstructure of the alloy（Mg_（97）Er_2Zn_1）_（99.82）Zr_（0.18） is more fine than that of the alloy（Mg_（97.5）Er_2Zn_（0.5））_（99.82）Zr_（0.18） due to the increase of Zn content. The spacing of the secondary dendrite arm decreases, and the second phases change from discontinuous reticular distribution to layered distribution after adding Zn into the alloy. The grain of the alloy is also refined after the addition of the element Zr and the distribution of second phases is more dispersed. However, the composition of the second phase is not changed, which is still consisted of the phases of X-Mg_（12）Er_1Zn_1 and（Mg,Zn）x Er. Furthermore, the mechanical properties of alloys are improved obviously with the increase of the elements Zn and Zr.

关 键 词：Mg-Er-Zn-Zr合金 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]