Ag对Mg-4Zn-0.5Sr合金显微组织与力学性能的影响  

Effects of Ag on Microstructure and Mechanical Properties of Mg-4Zn-0.5Sr Alloy

作　　者：高志贤 卞建从 陈斌 万鹏 吴慧舒 李卫荣 刘福生[1] 李润霞 Gao Zhixian;Bian Jiancong;Chen Bin;Wan Peng;Wu Huishu;Li Weirong;Liu Fusheng;Li Runxia(College of Materials Science and Engineering,Shenzhen University;School of Materials Science and Engineering,Shenyang University of Technology;School of Materials Science and Engineering,Dongguan Unievrsity of Technology;Mei′an Magnesium Science and Technology Co.,Ltd.)

机构地区：[1]深圳大学材料学院 [2]沈阳工业大学材料科学与工程学院 [3]东莞理工学院材料科学与工程学院 [4]镁安镁业科技有限公司

出　　处：《特种铸造及有色合金》2022年第8期996-999,共4页Special Casting & Nonferrous Alloys

基　　金：广东省重点领域研发计划资助项目(2020B010186002);东莞市社会科技发展(重点)项目(2020507140148)。

摘　　要：研究了Ag含量对Mg-4Zn-0.5Sr合金组织与性能的影响。通过光学显微镜(OM)、扫描电镜(SEM)、万能试验机、X射线衍射仪(XRD)和能谱仪对合金的显微组织、拉伸断口形貌、力学性能和物相进行分析。结果表明,合金组织主要由基体α-Mg、晶界上错落分布的点状MgZn相、长条状的Mg_(17)Sr_(2)相和短粗状Mg_(4)Ag相组成。随着Ag含量增加,合金晶粒尺寸先增大后减小,力学性能呈现先增加后减小的趋势。当Ag含量为0.5%时,合金晶粒尺寸最小,为83.28μm,此时合金的抗拉强度达到182 MPa,屈服强度为102 MPa,伸长率为13.81%。The effects of Ag content on microstructure and properties of Mg-4 Zn-0.5 Sr alloys were investigated.The microstructure,tensile fracture morphology,mechanical properties and phase of the alloy were analyzed by optical microscope(OM),scanning electron microscope(SEM),universal testing machine,X-ray diffraction(XRD)and energy dispersive spectrometer.The results show that the microstructure of the alloy is mainly composed ofα-Mg matrix,dotted MgZn phase of staggered distribution,elongated Mg_(17)Sr_(2) phase and short coarse Mg_(4)Ag phase distributed at grain boundaries.With the increase of Ag content,the grain size of the alloy is increased firstly and then decreased,and the mechanical properties of the alloy is increased firstly and then decreased.When Ag content is 0.5%,the grain size of the alloy reaches 83.28μm,and the alloy presents desirable mechanical properties with maximum tensile strength of 182 MPa,yield strength of 102 MPa and elongation of 13.81%.

关 键 词：镁合金 AG 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] TG113.25[金属学及工艺—金属材料]