Mn含量对含铁AZ91镁合金铸态组织与性能的影响  

Effects of Mn Content on the As-cast Microstructure and Performance of AZ91 Mg Alloys with 0.2%Fe

作　　者：范晓明[1] 万朋[1] 文红艳[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,武汉市430070

出　　处：《中国铸造装备与技术》2008年第6期16-18,共3页China Foundry Machinery & Technology

摘　　要：本文采用金相显微镜(OM)、X射线衍射分析(XRD)、INSTRON5882万能材料试验机和失重法研究了Mn含量(WMn=0.1%、0.2%、0.5%和0.9%)对含铁AZ91镁合金的铸态显微组织、力学性能和腐蚀性能的影响。研究结果表明:在本试验条件下,合金的铸态组织主要由α-Mg+β-Mg17Al12+Al6Mn等相组成;适宜的Mn加入量可以细化合金组织,提高合金的力学性能;含Mn量为0.2%时可获得较好的力学性能,其抗拉强度和伸长率分别为149MPa和1.40%;Mn的加入还能显著提高含铁AZ91镁合金的耐蚀性能,当Mn含量由0.1%增加到0.9%时,合金的腐蚀速率由41.7mg(/cm2·d)降为0.7mg(/cm2·d)。The effects of different Mn contents （WMn=0.1% ,0.2% ,0.5% and 0.9% ）on the mechanics properties, microstructure and corrosion resistance of AZ91 Mg alloys with 0.2%Fe have been vestigated by optical microscope （OM）, X-ray diffraction analysis. （XRD）, universal material testing machine and weight loss method. The experimental results show that the as-cast microstructure of AZ91 alloys with iron are composed mostly of the phases of α-Mg,β-Mg17Al12,AI6Mn et al. The structure of alloys can be refined and their mechanics properties tensile strength 149MPa and elongation 1.40% can also be obtained by the addition of Mn.of which the optimal content is 0.2 percent.FurthermoreManganese can obviously improve the corrosion- resistant properties of alloys when Mn content rised from 0.1% to 0.9%, alloy corrosion rate lowered from 41.7mg/（cm^2·d ） to 0.7mg/（cm^2· d ）.

关 键 词：MN元素 AZ91镁合金 显微组织 力学性能 腐蚀性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]