粉末冶金法制备AZ91镁合金的组织及热性能  

Microstructure and thermal property of AZ91 magnesium alloy prepared by powder metallurgy

作　　者：张洋[1] 王西涛[1] 姜海[2] 何新波[2] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2008年第12期1393-1396,共4页Journal of University of Science and Technology Beijing

基　　金：教育部新世纪人才计划资助项目(No.NCET-05-0104);北京科技大学422人才计划资助项目(No.200504)

摘　　要：采用粉末冶金方法制备了AZ91镁合金,研究了烧结温度对合金的致密度和热导率的影响规律,并对烧结样品的物相和显微组织进行了分析.研究发现,AZ91镁合金的最佳烧结温度为610℃,致密度可以达到97.4%,实验条件下所获得的最高热导率可达到63.1W.m-1.K-1.X射线衍射和扫描电子显微镜结果分析表明,烧结合金组织主要由α-Mg固溶体和β-MgAl相两相组成,其中β-MgAl相表现出离异共晶β相和非连续析出β相两种主要存在形态.AZ91 magnesium alloy was fabricated by powder metallurgy. The effects of sintering temperature on the relative density and thermal conductivity were investigated. The microstructure of the material was observed by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The result shows that the best sintering temperature is 610 12. At this sintering temperature the relative density can reach 97.4 % and the highest thermal conductivity can be up to 63.1 W· m^- 1· K^- 1. The sintering microstructure of the alloy is composed of α-Mg solid solution matrix and β-Mg17Al12. The β phase exhibits two main forms, i.e., divorced eutectic 13 phase and discontinuous precipitated β phase.

关 键 词：AZ91镁合金 粉末冶金 微观组织 热性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TF124[金属学及工艺—金属材料]