准晶对AZ91微观组织及摩擦磨损性能的影响  

Effect of Magesium-Based Quasicrystal Addition on the Microstructure and Wear Properties of AZ91Magnesium Alloy

作　　者：刘腾[1] 滕新营[1] 刘立艳[1] 

机构地区：[1]济南大学材料科学与工程学院,山东济南250022

出　　处：《济南大学学报（自然科学版）》2012年第3期225-229,共5页Journal of University of Jinan(Science and Technology)

基　　金：山东省自然科学基金(Y2007F69);山东省优秀中青年科学家科研奖励基金(2008BS04018)

摘　　要：采用普通铸造法制备含高体积分数准晶相的Mg-Zn-Y(MZY)准晶中间合金。经SEM,EDS、XRD检测和摩擦磨损试验,研究MZY准晶颗粒加入量对AZ91基体合金微观组织及耐磨性能的影响。结果表明:MZY准晶颗粒可以明显细化AZ91合金的铸态组织,且骨骼状连续网状分布的β-Mg17Al12相断裂为弥散的岛状,合金的铸态组织中除α-Mg相、β-Mg17Al12相外还出现弥散分布在晶界处的高温稳定的Mg3Zn6Y准晶相;在不同载荷条件下,添加质量分数为6%的MZY准晶合金试样的摩擦因数由0.68减小至0.26,在100 N载荷下干摩擦30 min,其质量磨损量仅为基体合金质量的46.2%,磨损机理由基体的黏着摩擦转变为磨粒摩擦。MZY quasicrystal master alloy was prepared under convetional casting conditions, and the microstructure and wear prop- erties of AZ91 alloys with adding different additions of MZY quasierystal master alloy were investigated by XRD, SEM, EDS and friction- wear tests etc. The results show that after adding MZY quasierystal master alloy, the microstrueture of matrix alloy has been obviously re- fined, and the morphology of 13-MglTA112 phase changes from continuous nets to discontinuous nets or even to particles;For the addition of MZY quasicrystal alloy into AZ91 alloy, the Mg3 ZnrY quasierystal phase dispersively distributes on the grain boundaries;Under dif- ferent load conditions, the friction coefficient of the samples with 6% MZY quasicrystal alloy decreases from 0.68 to 0.26, and their mass wear is only 46.2% of the matrix alloy＇ s under 100 N load in 30 min dry friction. The wear properties are obviously improved, and the friction mechanism changes from conglutination abrasion to grain abrasion with increasin~ of MZY quasicrtstal alloy.

关 键 词：准晶强化 AZ91 微观组织 耐磨性能 

分 类 号：TG294[金属学及工艺—铸造]