变质处理对MB2镁合金挤压变形前后组织与性能的影响  

Effects of Modification on the Microstructure and Properties of MB2 Magnesium Alloy Before and After Deformation

作　　者：赵洋[1] 李光玉[1] 胡尚伟[1] 

机构地区：[1]吉林大学通信工程学院

出　　处：《特种铸造及有色合金》2008年第6期439-441,共3页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展计划(973计划)资助项目(2004CB619301);吉林大学985汽车工程计划资助项目;吉林大学校内创新基金资助项目

摘　　要：通过加入稀土及其他合金元素对MB2镁合金铸锭进行复合变质处理,随后在330℃下进行挤压成形,得到强度高、塑性变形性能优良的镁合金型材,并采用金相显微镜、图像分析系统及MTS-810材料测试系统等分析了变质元素对镁合金组织性能的影响。结果表明,变质处理可以使β-Mg17Al12相由原来的连续网状分布变为分散的粒状分布,并使铸态MB2镁合金的晶粒由原来的100～200μm细化到约15～35μm;挤压变形后变质的MB2镁合金晶粒进一步细化到5～10μm左右,合金的抗拉强度和伸长率分别由原来的247MPa和13%提高到312MPa和22%。The MB2 magnesium alloy profile bar with high strength and plasticity which was modified by Re and some special elements was prepared by extruded forming at 330 ℃.Effects of modification elements on microstructure and properties of the Mg alloy profile bar before and after deformation was observed by optical microscope(OM),image analysis system and MTS-810 materials testing system.The results reveal that the morphology of β-Mg17Al12 phase is converted from the continuous net-like structure into dispersive particles and the grain size is decreased from 100~200 μm to 15~35 μm in the modified magnesium alloy.The grain size of the modified MB2 magnesium alloy after deformation is further refined to 5~10 μm,and tensile strength and elongation are remarkably increased from 247 MPa and 13% to 312 MPa and 22%,respectively.

关 键 词：MB2镁合金 变质处理 挤压变形 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] TG249.2[金属学及工艺—金属材料]