Sr对含铁镁合金组织与性能的影响  

Effect of Strontium on Microstructure and Properties of AZ91 Magnesium Alloy Containing Iron

作　　者：范晓明[1] 万朋[1] 文红艳[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《铸造技术》2009年第1期57-60,共4页Foundry Technology

摘　　要：以含0.2%Fe的AZ91合金为基体,采用镁合金大气环境下的熔铸工艺,使用金相显微分析(OM)、X射线衍射分析(XRD)和电子万能材料试验机等分析测试方法,研究了Sr的加入量对含铁AZ91镁合金组织与性能的影响。结果表明:当Sr的质量分数为0.2%～0.5%时,Sr对所研究合金的晶粒有明显细化作用,并可以提高合金的强度和延展性,但是耐蚀性降低。当Sr添加量达到0.8%时,晶粒有粗化倾向,且形成A14Sr新相,合金的耐蚀性有所提高;试验条件下,Sr为0.5%时合金力学性能最佳。The effect of Sr addition on microstructures and properties of AZ91 alloy containing iron was investigated by optical microscopy （OM）, X-ray diffraction（XRD）, and electronic universal material testing machine. The results show that 0.2 wt%-0.5 wt% Sr addition can refine the grain significantly, increase the tensile strength and elongation, and decrease the corrosion resistance. When the addition of Sr content reaches 0. 8wt%, the grain has a tendency to be coarsed. Meanwhile, a new A14Sr phase is formed and the corrosion resistance is improved. In this investigation, the alloy with 0.5%Sr addition has the optimal mechanical properties.

关 键 词：SR AZ91镁合金 显微组织 力学性能 耐蚀性 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]