Mg-Sr-Y合金的制备及其第二相的研究  

Research on Preparation and Second Phase of Mg-Sr-Y Alloy

作　　者：张晓霞[1,2] 张星 陈刚[2] 齐磊[3] 张治民 

机构地区：[1]山西省集成精密成形工程研究中心,山西太原030051 [2]重庆科技学院冶金与材料工程学院,重庆401331 [3]中北大学材料科学与工程学院,山西太原030051

出　　处：《热加工工艺》2014年第8期36-39,共4页Hot Working Technology

基　　金：国家重点基础研究发展计划资助项目(2007CB613702);重庆市科技攻关计划资助项目(CSTC;2006AA4012);重庆市自然科学基金资助项目(CSTC;2008BB4323)

摘　　要：常规镁合金晶粒粗大、高温力学性能低、耐蚀性差,限制了其在生产中的应用。添加变质剂以细化晶粒可提高其综合力学性能。采用"对渗法"制备不同成分配比Mg-Sr-Y合金,用光学金相显微镜、扫描电镜、能谱仪和XRD等研究了Sr/Y比值对Mg-Sr-Y合金组织形态及其第二相的影响。结果表明:Mg-Sr-Y合金组织由枝晶状的初生相α-Mg和鱼骨状的共晶组织(α-Mg+Mg17Sr2)及(α-Mg+Mg24Sr5)组成。实验随Y含量的增加,镁合金铸态组织得到细化,但Sr含量的增加却使合金组织粗化。The coarse grain, poor high-temperature mechanical property and corrosion resistance of conventional magnesium （Mg） alloys can restrict their applications in production. The size of crystalline grain can affect the mechanical properties of Mg alloys. Adding small amount of combined additions Sr and Y into Mg alloys can refine the crystalline grain to improve the comprehensive mechanical properties, ha this work, OM, SEM and EDS were used to research the as-cast microstructure and the second phases of Mg-Sr-Y alloy which were prepared by direct mixing method. The results indicate that the as-cast microstructure of Mg-Sr-Y alloy is composed of dendritic matrix phase a-Mg and fish-bone-like eutectic structure （α-Mg＋Mg17Sr2, α-Mg＋Mg24Srs） distributing in the grain boundaries and among the dendrites. And it also has been found that the microstructure of Mg-Sr-Y alloy can be affected by the amount of Sr and Y addition.

关 键 词：Mg—Sr—Y合金 制备 组织 第二相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]