铈、锶和钡元素复合添加对AZ91镁合金显微组织和力学性能的影响
Effect of Mixed Addition of Ce,Sr and Ba on Microstructure and Mechanical Properties of AZ91 Magnesium Alloy
摘 要
采用光学显微镜、X射线衍射仪﹑扫描电镜和能谱仪等研究了铈、锶和钡元素复合添加对AZ91镁合金显微组织和力学性能的影响.结果表明:铈、锶和钡的加入可以显著细化该合金的铸态组织,提高合金的室温力学性能;同时添加质量分数0.5%Ce,0.2%Sr和0.2%Ba时细化效果最好,合金的粒径最小,小块状的β-Mg17Al12相最多,在基体中可弥散分布;合金的抗拉强度和伸长率达到了195 MPa和1.86%,较未添加合金元素的分别提高了25.0%和24.0%.
合金化
显微组织
力学性能
AZ91 magnesium alloy
alloying
microstructure
mechanical property
Abstract
The effect of mixed addition of Ce,Sr and Ba elements on microstructure and mechanical properties of the AZ91 magnesium alloy by means of optical microscope,X-ray diffraction analyzer,scanning electron microscope and energy dispersive spectroscopy was investigated.The results show that the as-cast microstructure as well as room temperature mechanical properties could be greatly refined and improved by mixed addition of Ce,Sr and Ba.In the case of simultaneous addition of 0.5wt%Ce,0.2wt%Sr and 0.2wt%Ba,the grain-refining effect of the alloy was the best,the grain size was the smallest,and the quantity of the small bulk β-Mg17Al12 phase which distributed dispersively in the matrix was the most.The tensile strength as well as the elongation of the alloy increased by 25.0% and 24.0% than the alloy without alloy element addition,up to 195 MPa and 1.86% respectively.
中图分类号 TB331
所属栏目 试验研究
基金项目 高等学校博士学科点专项科研基金资助项目(20070299004);江苏省高技术研究项目(BG2007030);江苏省高校自然科学重大基础研究项目(07KJA43008)
收稿日期 2009/9/9
修改稿日期 2010/6/30
网络出版日期
作者单位点击查看
备注佘昌俊(1984-),男,安徽天长人,硕士研究生.
引用该论文: SHE Chang-jun,ZHAO Yu-tao,CHEN Gang,ZHANG Song-li,ZHU Xiao-hui,WANG Chang-qin. Effect of Mixed Addition of Ce,Sr and Ba on Microstructure and Mechanical Properties of AZ91 Magnesium Alloy[J]. Materials for mechancial engineering, 2010, 34(11): 23～26
佘昌俊,赵玉涛,陈刚,张松利,祝晓辉,汪长勤. 铈、锶和钡元素复合添加对AZ91镁合金显微组织和力学性能的影响[J]. 机械工程材料, 2010, 34(11): 23～26
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参考文献
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【2】张韧,袁森,蒋百灵,等.Ce对共晶Mg-Al合金组织的影响[J].特种铸造及有色合金,2006,26(5):310-312.
【3】高鹏,吴玉锋,李建辉,等.Sn对AZ61镁合金微观组织和力学性能的影响[J].特种铸造及有色合金,2006,26(12):797-799.
【4】KANG D H,PARK S S,KIM N J.Development of creep resistant die cast Mg-Sn-Al-Si alloy[J].Materials Science and Engineering A,2005,413/414:555-560.
【5】刘生发,黄尚宇,徐萍.Ce对AZ91镁合金铸态组织细化的影响[J].金属学报,2006,42(4):443-448.
【6】李金峰,耿浩然,滕新营.Ba对AZ91镁合金组织和性能的影响[J].热加工工艺,2005(7):5-7.
【7】刘生发,王慧源.Sr对AZ91镁合金铸态组织的影响及其细化机制[J].稀有金属材料与工程,2006,35(6):970-973.
【8】黄正华,郭学锋,张忠明.合金化对AZ91镁合金组织与力学性能的影响[J].稀有金属材料与工程,2006,35(3):363-366.
【9】腾新营,王彬,王致明,等.微量Si、Ba、Sn对AZ91铸态组织的影响[J].特种铸造及有色合金,2007,27(2):83-85.
【10】李元东,郝远,陈体军.AZ91镁合金半固态挤压铸造的研究[J].热加工工艺,2004(1):7-11.
【11】ALIRAVCL C A,GRUZLSKI J E,DIMAYUGA F C.Effect of strontium on the shrinkage microporosity in magnesium sand castings[J].AFS Transactions,1992,100:353-362.
【12】STJOHN D H,MA Q,EASTON M A,et al.Grain refinement of magnesium alloys[J].Metallurgical and Materials Transactions A,2005,36:1669-1679.
【13】LEE Y C,DAHLE A K,STJOHN D H.The role of solute in grain refinement of magnesium[J].Metallurgical and Materials Transactions A,2000,31:2895.
【14】YUAN G Y,LIU Z L,WANG Q D,et al.Microstructure refinement of Mg-Al-Zn-Si alloys[J].Mater Letters,2002,56:53-58.
【15】刘正,张奎,曾小勤.镁基轻质合金理论基础及其应用[M].北京:机械工业出版社,2002:25.
【16】李仕慧.Ce、Y对AZ91D镁合金力学性能及耐腐蚀性的影响[D].包头:内蒙古工业大学,2007:26.
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