Y对AZ31镁合金铸态组织和性能的影响  

Effects of Y on Microstructure and Mechanical Properties of As-cast AZ31 Magnesium Alloy

作　　者：张金旺[1,2] 许并社[3,2] 

机构地区：[1]太原经济技术开发区,山西太原030032 [2]教育部新材料界面与工程重点实验室,山西太原030024 [3]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《中北大学学报（自然科学版）》2009年第2期192-196,共5页Journal of North University of China(Natural Science Edition)

基　　金：国家自然科学基金重大研究计划项目资助(90306014)

摘　　要：采用真空熔炼炉制备AZ31Y镁合金,观察其微观组织,对析出相进行分析,并着重讨论了提高其力学性能的途径.结果表明,Y在AZ31镁合金中主要以块状Al2Y化合物形式存在;高熔点的Al2Y在合金凝固过程中首先析出,成为凝固的异质形核剂,从而细化了合金组织,改善了室温和高温力学性能;由于Y的强化,含Y AZ31镁合金平均晶粒尺寸降低幅度约为35.82%;室温抗拉强度、屈服强度和延伸率分别为212MPa,147 MPa和7.5%,200℃时分别为117 MPa,98 MPa和10.2%.AZ31 magnesium alloy was prepared in vacuum melting furnace. The alloy＇s microstructure and mechanical properties were studied, and precipitation phase was analyzed in a way to improve the alloy＇s mechanical properties. The results show that yttrium （Y） exists as the form of compound （A12Y） in AZ31 magnesium alloy, and dystectic A12Y as the heteromorphic nucleation emerges firstly in the course of alloy precipitation, which refines the alloy＇s microstructure and obviously improves the mechanical properties at room and high temperature. The average grain size of AZ31 magnesium alloy containing Y is reduced by 35.82%. Tensile strength, yield strength and elongation percentage reach 212 MPa, 147 MPa, and 7.5% at room temperature respectively, and 117 MPa, 98 MPa, and 10.2% at 200℃ respectively.

关 键 词：镁合金 钇(Y) 微观组织 力学性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]