含准晶相的Mg-Zn-Gd-Er-Zr合金的组织和拉伸性能  

Microstructure and tensile properties of Mg-Zn-Gd-Er-Zr alloys containing I-phase

作　　者：李龙[1] 张磊[1] 杨伟[1] LI Long;ZHANG Lei;YANG Wei(School of Aeronautical Manufacture Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《材料热处理学报》2023年第10期96-101,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(52061032);江西省自然科学基金(20181BAB206005)。

摘　　要：采用重力铸造方法制备了3种Mg-6Zn-(1.6-x)Gd-xEr-0.5Zr(x=0.4,0.8和1.2)合金,研究了3种铸态合金的显微组织和拉伸性能。结果表明:3种合金的组织均主要由α-Mg基体和准晶相组成。随着Er含量的增加,合金中初生α-Mg晶粒逐渐细化,其形貌由等轴枝晶状转变为蔷薇状,同时呈不连续网状分布在晶界处的第二相也有逐渐断开的趋势。随着Er含量的增加,合金的拉伸性能逐渐提高。当Er含量为1.2 mass%时,Mg-6Zn-0.4Gd-1.2Er-0.5Zr合金的极限抗拉强度和伸长率分别为209 MPa和10.4%,相较于Mg-6Zn-1.2Gd-0.4Er-0.5Zr合金提升了27.4%和33.3%。Three Mg-6Zn-(1.6-x)Gd-xEr-0.5Zr(x=0.4,0.8 and 1.2)alloys were prepared by gravity casting method,and microstructure and tensile properties of the three as-cast alloys were studied.The results indicate that the microstructure of the all three alloys is mainly composed ofα-Mg matrix and I-phase.With the increase of Er content,the primaryα-Mg grains in the alloy gradually refine,and their morphology changes from equiaxed dendritic to rosette-like.At the same time,the second phase distributed in a discontinuous network at the grain boundaries also shows a trend of gradually breaking off.The tensile properties of the alloy gradually improve with the increase of Er content.When the Er content is 1.2 mass%,the ultimate tensile strength and elongation of Mg-6Zn-0.4Gd-1.2Er-0.5Zr alloy are 209 MPa and 10.4%,respectively,which are increased by 27.4% and 33.3% compared to the Mg-6Zn-1.2Gd-0.4Er-0.5Zr alloy.

关 键 词：Mg-Zn-Gd-Er合金 准晶相 组织 拉伸性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]