Zn对铸态Mg-10Gd-3Sm-0.5Zr合金组织和力学性能的影响  

Effect of Zn on microstructure and mechanical properties of as-cast Mg-10Gd-3Sm-0.5Zr alloy

作　　者：史浩鹏 李全安[1,2] 陈晓亚 戚尧[1] SHI Hao-peng;LI Quan-an;CHEN Xiao-ya;QI Yao(School of Mtiterials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Collaborative Innovation Center of Nonferrous Metals,Henan Province,Luoyang 471023,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]有色金属共性技术河南省协同创新中心,河南洛阳471023

出　　处：《材料热处理学报》2020年第4期34-39,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51571084,51171059)。

摘　　要：采用熔炼铸造法制备了添加0~2%Zn(质量分数)的Mg-10Gd-3Sm-0.5Zr合金,通过X射线衍射、扫描电镜和拉伸性能测试等分析了Zn对铸态Mg-10Gd-3Sm-0.5Zr合金组织与性能的影响。结果表明:铸态Mg-10Gd-3Sm-0.5Zr合金由粗大枝晶α-Mg基体和晶界处半连续分布稀土相Mg41(Sm,Gd)5和Mg5Gd(Sm)组成,加入Zn元素后,在合金中产生了新相(Mg,Zn)3(Sm,Gd)1;铸态Mg-10Gd-3Sm-xZn-0.5Zr合金室温拉伸力学性能随着Zn元素含量的增加先升高后降低,当Zn的添加量为1%时,综合力学性能最好,其抗拉强度、屈服强度、伸长率分别为215 MPa、173 MPa和5.5%;合金的断裂方式主要为脆性断裂,加入Zn元素后有向韧性断裂转变的趋势。Mg-10 Gd-3 Sm-0.5 Zr alloy with 0-2%Zn(mass fraction)was prepared by smelting and casting method,and the effect of Zn on microstructure and properties of the as-cast Mg-10 Gd-3 Sm-0.5 Zr alloy was analyzed by means of X-ray diffraction,scanning electron microscopy and tensile property test.The results show that the microstructure of the as-cast Mg-10 Gd-3 Sm-0.5 Zr alloy is composed of the coarse dendriteα-Mg matrix and the semi-continuous distribution of rare-earth phase Mg41(Sm,Gd)5 and Mg5Gd(Sm)at the grain boundary,and after the addition of the Zn element,a new phase(Mg,Zn)3(Sm,Gd)1 is observed in the alloy.The mechanical properties of the as-cast Mg-10 Gd-3 Sm-xZn-0.5 Zr alloy at room temperature increase first and then decrease with the increase of the content of the Zn element,and when the addition amount of Zn is 1 mass%,the comprehensive mechanical properties of the alloy are the best,the tensile strength,the yield strength and the elongation of the Mg-10 Gd-3 Sm-1 Zn-0.5 Zr alloy are 215 MPa,173 MPa and 5.5%,respectively.The fracture mode of the alloy is mainly brittle fracture,and after the addition of the Zn element,there is a tendency to transition to the ductile fracture.

关 键 词：Mg-10Gd-3Sm-0.5Zr ZN 显微组织 抗拉强度 

分 类 号：TG146.2[一般工业技术—材料科学与工程]