AZ91HP镁合金流变压铸工艺与性能研究  

Study on Rheo-Diecasting Process and Properties of AZ91HP Magnesium Alloy

作　　者：杨柳青[1] 康永林[1] 张帆[1] 陶涛[1] 

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：《铸造》2009年第11期1119-1122,共4页Foundry

基　　金：国家高技术研究发展计划(863计划)项目(2006AA03Z115);"十一五"国家科技支撑计划项目(2006BAE04B09-4)

摘　　要：采用自行开发的锥桶式半固态浆料制备装置,并结合实验室压铸机,研究了AZ91HP镁合金流变压铸成形的工艺与性能。结果表明:内锥桶转速越大,成形件内部晶粒越细小,转速为600r/min时,初生α-Mg固溶体主要由近球形颗粒组成,颗粒尺寸细小圆整,平均尺寸为38～40μm;剪切温度较高时,成形件内部初生α-Mg晶粒较粗大,圆整度较好;剪切温度较低时,初生α-Mg晶粒较细小,圆整度相对较差。不同工艺下流变压铸件抗拉强度及伸长率均高于普通液态压铸件,其中抗拉强度提高10%～15%,伸长率提高40%以上。The process and properties of rheo-diecasting AZ91HP magnesium alloy were in- vestigated by using of self-developedtaper barrel semi-solid slurry preparation device as well as pressure die casting machine in the laboratory. The results show that the faster the rotational speed of internal taper barrel, the smaller the inner grain of the rheo-diecasting components. The primary α-Mg solid solution is mainly composed of near spherical particles when internal barrel speed is 600 r/min, and the particle size is small and round, with an average size of 38-40 μm. When shear temperature is relatively high, the primary a-Mg is coarser and the roundness is better. While shear temperature is low, the primary α-Mg becomes smaller, but the roundness is relatively worse. Mechanical properties of the rheo-diecasting components under different technological conditions are higher than those of the die-casting parts, in which the tensile strength improves 10%-15% and the elongation increases more than 40%.

关 键 词：AZ91HP镁合金 流变压铸 微观组织 力学性能 

分 类 号：TG249.2[金属学及工艺—铸造]