Mg-5Zn-xAl镁合金组织及力学性能研究  

Study on Microstructure and Mechanics Properties of Mg-5Zn-xAl Magnesium Alloys

作　　者：吕峥[1] 黄晓锋[1] 冯凯[1] 李琴[1] 李维亮[1] 

机构地区：[1]兰州理工大学,甘肃兰州730050

出　　处：《中国铸造装备与技术》2013年第2期46-49,共4页China Foundry Machinery & Technology

基　　金：973前期研究专项(项目编号:2010CB635106);甘肃省高等学校基本科研项目

摘　　要：采用金属型铸造制备了Mg-5Zn-xA(lx=2,4,6,wt.%)镁合金,并利用光学显微镜、X射线衍射和扫描电镜及力学性能测试等手段研究了Al含量的变化对合金的显微组织和力学性能的影响。结果表明,随着Al含量的增加,实验合金显微组织主要由α-Mg+Mg32(Al,Zn)49+MgZn转变为α-Mg+Mg32(Al,Zn)49;当Al含量增加到6%时,实验合金共晶组织转变为α-Mg+Mg32(Al,Zn)49+Mg17Al12;当Al含量为2%时,合金的抗拉强度和延伸率达到最大,分别为227MPa和10.8%,在随后Al的续加过程中,两者均降低。断裂方式也由准解理断裂转变为解理断裂。Mg-5Zn-xAl（x=2,4,6,wt.%） alloys have been prepared by cast in metal mold. The effect of variety of Al content （wt.%） on the microstructure and mechanics properties of alloys has been studied by optical microscope, scanning electron microscope, X-ray diffractrometry, mechanics property test. The results indicated that the compose of the alloys changed from a-Mg＋Mg32（Al,Zn）49＋MgZn phase to α-Mg＋Mg32 （Al,Zn）49 phase with the increasing Al content as the eutectie turned to α-Mg＋Mg32 （A1,Zn）49＋Mg17Al12 with a 6% Al content. The ultimate tensile strengths and elongations of these alloys reached their maximum with the content of 2% Al, with values of 227 MPa and 10.8% respectively whereas all the both reduced with an increase of Al further and the tensile fracture surfaces also changed from a mode of quasi-cleavage to cleavage.

关 键 词：MG-ZN-AL合金 AL含量 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]