含二十面体准晶相Mg-Zn-Y合金的组织和性能  

Microstructure and Mechanical Properties of Mg-Zn-Y Alloys Containing Icosahedral Quasicrystal

作　　者：杨玲[1] 赵宇宏[1] 侯华[1] Yang Ling;Zhao Yuhong;Hou Hua(School of Materials Science and Engineering,North University of China)

机构地区：[1]中北大学材料科学与工程学院,太原030051

出　　处：《特种铸造及有色合金》2021年第3期275-279,共5页Special Casting & Nonferrous Alloys

基　　金：山西省科技重大专项资助项目(20181101014,20191102008,20191102007);国家自然科学基金资助项目(51774254,51774253,51701187,51674226,51804279,51801189);山西省平台基地和人才专项资助项目(201805D211036);中央引导地方科技发展专项资金资助项目(YDZX20191400002796);山西省科技成果转化引导专项资金资助项目(201804D131039);装备预研领域基金重点资助项目(61409230407);山西省青年科技研究基金资助项目(201901D211256,201801D221152)。

摘　　要：采用常规凝固技术制备了MgZn_(6x)Y_(x)(x=0.7,1.0,1.5,2.0)合金,研究了Y含量对含有二十面体准晶相(I相)MgZn_(6x)Y_(x)合金组织和性能的影响。结果表明,MgZn6xYx合金由α-Mg基体和分布在晶界周围的(α-Mg+I相)共晶组织组成。随着Y含量增加,基体晶粒尺寸减小,共晶组织尺寸增大,含量增加,由不连续分布转变为连续分布。在凝固过程中,二十面体准晶相通过共晶转变形成。Mg_(89.5)Zn_(9.0)Y_(1.5)合金的抗拉强度和伸长率达到最大值,分别为179.2MPa和3.5%。MgZn_(6x)Y_(x)合金的断口呈现准解理断裂特征。MgZn_(6x)Y_(x)(x=0.7,1.0,1.5,2.0,atomic in%)alloys were prepared by conventional solidification technique.The effects of Y content on microstructure and mechanical properties of MgZn6xYx alloys containing icosahedral quasicrystal phase(I-phase)as a secondary solidification phase were investigated.The results show that MgZn6xYx alloys consist ofα-Mg matrix and(α-Mg+I-phase)eutectic structure which is distributed around the grain boundaries.With the increase of Y addition,the matrix grain size is decreased,and the content and the size of eutectic structure are increased,meanwhile the morphology of which also is transformed from discontinuous distribution to continuous distribution.During the solidification process,I-phase is formed undergoing eutectic reaction.Mg_(89.5)Zn_(9.0)Y_(1.5) alloy exhibits the maximum ultimate tensile strength of 179.2 MPa and the maximum elongation of 3.5%,respectively.The fracture mode of MgZn_(6x)Y_(x) alloys is characterized by quasi-cleavage fracture.

关 键 词：MgZn_(6x)Y_(x)合金 二十面体准晶相 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] TG292[金属学及工艺—金属材料]