Zr含量对Mg-5Zn-2Al镁合金组织与性能的影响  

Effects of Zr Content on Microstructure and Mechanical Properties of Mg-Al Magnesium Alloy

作　　者：黄晓锋[1,2] 梁艳[1] 曹喜娟[2] 朱凯[2] 王韬[2] 谢锐[1] 

机构地区：[1]兰州理工大学有色金属合金及加工教育部重点实验室 [2]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室

出　　处：《特种铸造及有色合金》2009年第7期660-662,共3页Special Casting & Nonferrous Alloys

基　　金：甘肃省自然科学基金资助项目(3ZS062-B25-026);兰州理工大学博士基金资助项目(SB01200406)

摘　　要：采用光学显微镜及拉伸试验机等手段,研究了Zr含量对Mg-5Zn-2Al合金铸态和热处理后显微组织及力学性能的影响。结果表明,Zr的加入使Mg-5Zn-2Al镁合金的铸态和热处理后的晶粒得到明显的细化。在铸态及热处理条件下,合金的抗拉强度与伸长率均呈现先上升后下降的变化趋势。对于铸态合金而言,Zr含量为0.6%时,Mg-5Zn-2Al合金的晶粒最为细小,并且其抗拉强度与伸长率均达到最大值,为215MPa和12.563%。经热处理后,合金的抗拉强度较铸态得到了显著地提高。当Zr含量为0.6%时,合金的抗拉强度达到最大,为249MPa。Effects of Zr contents on microstructure and mechanical properties of as-cast and in heat treated Mg-5Zn-2Al magnesium alloy were investigated by OM (optical microscope) and tensile testing machine. The results verify that grain size in as-cast and in heat treated Mg-5Zn-2Al alloy can be remarkably refined with Zr addition. The tensile strength and elongation of the as-cast and heat treated alloy are firstly increased and then decreased. With 0.6% Zr addition,the desirable grain size in the as-cast alloy can be observed,and the tensile strength and elongation reach 215MPa and 12.563%,respectively. Compared with that of as-cast alloy,the tensile strength of the heat treated alloy is greatly improved with different Zr additions. With 0.6% Zr addition,the tensile strength of the heat treated alloy reaches 249MPa.

关 键 词：Mg-5Zn-2Al镁合金 显微组织 力学性能 热处理 

分 类 号：TG146.22[一般工业技术—材料科学与工程]