Mg-5Al-xY合金的铸态组织及力学性能  

Microstructure and Mechanical Properties of Mg-5Al-xY Magnesium Alloy

作　　者：冒国兵[1,2] 张光胜[1,2] 孙宇峰[1,2] 刘琪[1,2] 余小鲁[1,2] 

机构地区：[1]安徽工程大学机械与汽车工程学院,安徽芜湖241000 [2]安徽工程大学安徽高性能有色金属材料省级实验室,安徽芜湖241000

出　　处：《铸造》2013年第2期152-155,共4页Foundry

基　　金：安徽高校省级自然科学研究项目(KJ2012B015);芜湖市科技计划项目(2012)

摘　　要：研究了稀土钇(Y)对Mg-5Al镁合金铸态组织、高温力学性能及硬度的影响。结果表明:一定含量稀土Y的加入抑制了合金中Mg17Al12相的析出,形成了细小颗粒状和粗大块状的Al2Y耐热新相,显著提高了合金在175℃高温下的拉伸性能以及合金的显微硬度,合金的断裂特性由准解理断裂向准韧性断裂转变。Effects of Y addition on microstructure, elevated temperature （175℃） mechanical properties and microhardness of Mg-5A1 magnesium alloy were studied. The results indicate that new phase A12Y tbrms after the addition of yttrium in Mg-5AI magnesium alloy. A12Y phase is finely granular or massive. The lbrmation of Mg17Al12 phase is completely inhibited because of the addition of a certain number yttrium. The tensile properties at 175℃ of Mg-5A1 alloy are obviously improved when the quantity of Y addition is proper. Moreover, the microhardness is enhanced with the addition of yttrium. Fracture features of Mg-5AI-xY magnesium alloy are transferred from quasi-brittle fracture to quasi-ductile fracture.

关 键 词：Mg-5Al镁合金 钇 微观组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]