AZ91D镁合金强制对流流变压铸组织与性能  

Microstructure and Tensile Properties of AZ91D Magnesium Alloy by Forced Convection Rheo-diecasting Process

作　　者：周冰[1] 康永林[1] 祁明凡 张欢欢[1] 朱国明[1] 吴征洋 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料工程》2014年第10期1-5,共5页Journal of Materials Engineering

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB606302-1);国家高技术研究发展计划(863计划)资助项目(2013AA031001)

摘　　要：研究了流变压铸成形和传统压铸工艺下AZ91D镁合金连接压铸件的组织特征,分析了流变压铸过程中半固态浆料的形成和凝固行为,测试了FCR工艺下流变压铸拉伸件的力学性能。结果表明:FCR工艺下的流变压铸成形工艺不仅可以获得晶粒细小、形貌圆整的半固态组织,而且能够明显改善传统压铸成型件中的气孔缺陷,提高组织致密度。与传统压铸件相比,流变压铸拉伸件的抗拉强度和伸长率都有了明显的提高;T6热处理能进一步强化流变压铸拉伸件的性能,其抗拉强度和伸长率分别为286MPa和6.1%。The microstructure characteristics of AZ91D magnesium alloy connectors were investigated in traditional die-casting and rheo-diecasting process. The formation and solidification behavior of semi-solid slurry were analyzed. The tensile properties of rheo-diecasting tensile samples were tested. The results indicate that the forced convection rheo-diecasting process is able to obtain semi-solid microstructure with fine and near spherical grain. And the process can significantly improve porosity defects existed in traditional die castings and increase density. Compared with conventional die castings, the tensile strength and elongation of rheo-diecasting tensile samples have been significantly improved. T6 heat treatment further strengthens the property of rheo-diecasting tensile samples with the tensile strength of 286MPa and elongation of 6.1%.

关 键 词：强制对流搅拌装置 流变压铸 组织与性能 热处理 

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]