高压低温烧结AZ91细晶镁合金及其力学性能的研究  

Mechanical Properties of AZ91 Fine Grain Magnesium Alloy Processed by High-pressure and Low-temperature Sintering

作　　者：张文磊[1] 樊建锋[1] 张华[1] 董洪标[1] 许并社[1] 

机构地区：[1]太原理工大学新材料界面科学与工程教育部重点实验室山西省新材料工程技术研究中心材料科学与工程学院,太原030024

出　　处：《太原理工大学学报》2015年第4期380-384,共5页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目:HDDR原位压制成形法制备纳米晶Mg-Al合金的机理研究;纳米镁基材料中微观结构与性能间的关系研究(50901048;51174143);教育部新世纪优秀人才支持计划资助(NCET-12-1040);国家留学基金资助(1308140098)

摘　　要：为了细化镁合金晶粒,对AZ91粉末采用高压低温烧结方法制备细晶AZ91镁合金,利用金相显微镜和X射线衍射仪(XRD)分析了烧结体的显微组织与成分,研究了烧结时间与致密度和硬度的关系,揭示了高压低温烧结过程中烧结体内组织的细化与生长机理。结果表明,在1 200 MPa、300℃条件下烧结48h后,晶粒平均尺寸约10μm,致密度达到99.5%;与铸态时相比,高压低温烧结法制备的镁合金,其显微硬度(HV)值从81.6提高到103。本研究对回收利用工业镁合金废屑、拓展高性能镁合金研究提供一种新途径。In order to refine magnesium grain, AZ91 alloy with refined grains was prepared by high-pressure and low-temperature sintering. The microstructure evolution of sintered alloy was studied by means of metallographic microscope and X-ray diffraction （XRD）. The effect of sinte- ring time on the density and hardness of AZ91 alloy was also analyzed. The grain refinement and growth of sintered alloy during high-pressure and low-temperature sintering were investigated. The results reveal that AZ91 alloy was sintered completely after 48 hours under 1 200 MPa and 300 ℃. The average grain size of the sintered alloy was about 10μm. Moreover, the relative den- sity of the sintered AZgl alloy was 99.5% and the hardness of sintered alloy prepared by high- pressure and low-temperature sintering increased obviously, from 81.6 HV of the cast alloy to 103 HV. AZ91 alloy with refined grains was prepared by high-pressure and low-temperature sin- tering, hoping to provide a new method for recycling industrial magnesium alloy chips and expan- ding high-performance magnesium alloy research.

关 键 词：AZ91镁合金 高压低温烧结 晶粒细化 显微硬度 

分 类 号：TF124[冶金工程—粉末冶金]