Al对Mg-Zn-Y合金组织和拉伸性能的影响  

Effect of Al on microstructure and tensile properties of Mg-Zn-Y alloy

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》2024年第5期81-86,共6页Transactions of Materials and Heat Treatment

基　　金：江西省自然科学基金资助项目(20181BAB206005)。

摘　　要：研究了Al对铸态Mg_(95)Zn_(4)Y_(1)合金组织和拉伸性能的影响。结果表明:随着Al含量的增加,合金晶粒呈先细化后粗化的趋势。Mg_(94.7)Zn_(4)Y_(1)Al_(0.3)合金中初生α-Mg相的晶粒最细,其平均二次枝晶臂间距λ为31.9μm,相比Mg_(95)Zn_(4)Y_(1)合金降低了28.6%。添加Al有利于合金中I-phase的析出。随着Al含量的增加,合金的拉伸性能呈先升高后降低的趋势。Mg_(94.7)Zn_(4)Y_(1)Al_(0.3)合金表现出最优的室温拉伸性能,其极限拉伸强度和伸长率分别为211 MPa和9.7%,相比Mg_(95)Zn_(4)Y_(1)合金分别提高了28.7%和27.6%。Effect of Al on microstructure and tensile properties of as-cast Mg_(95)Zn_(4)Y_(1) alloy was investigated.The results show that the grains of the Mg_(95)Zn_(4)Y_(1) alloy show a trend of first refining and then coarsening with the increase of Al content.The grain size of the primary α-Mg phase in the Mg_(94.7)Zn_(4)Y_(1)Al_(0.3) alloy is the smallest,with an average secondary dendrite arm spacing of 31.9μm,which is decreased by 28.6% compared to the Mg_(95)Zn_(4)Y_(1) alloy.The addition of Al is beneficial for the precipitation of I-phase in the alloy.With the increase of Al content,the tensile properties of the alloy show a trend of first increasing and then decreasing.The Mg_(94.7)Zn_(4)Y_(1)Al_(0.3) alloy exhibits the best room temperature tensile properties,with ultimate tensile strength and elongation of 211 MPa and 9.7%,respectively,which are 28.7% and 27.6% higher than those of the Mg_(95)Zn_(4)Y_(1) alloy.

关 键 词：Mg_(95)Zn_(4)Y_(1)合金 AL 组织 拉伸性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]