钇对AM60B镁合金显微组织和性能的影响  

Effect of Yttrium Addition on Microstructure and Properties of AM60B Magnesium Alloy

作　　者：冒国兵[1] 张光胜[1] 孙宇峰[1] 刘琪[1] 

机构地区：[1]安徽工程科技学院机械工程系,安徽芜湖241000

出　　处：《铸造》2009年第6期607-610,共4页Foundry

基　　金：芜湖市科技计划项目(芜科计[2006]91);安徽工程科技学院青年基金(2006YQ037)

摘　　要：采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、电子万能实验机及电化学工作站,研究了Y对AM60B镁合金显微组织、常温及高温(175℃)力学性能和耐蚀性能的影响。结果表明:AM60B中加入Y后,形成了新的热稳定Al2Y相,沿着Mg17Al12相分布,使得Mg17Al12相由网状分布向颗粒状改变。Y加入量为0.6%时,合金试样力学性能和耐蚀性能都有所提高,当Y的加入量达到1.2%时,合金的XRD曲线出现了较强的Al2Y相衍射峰,在175℃时合金抗拉强度达到最高(为147MPa),室温力学性能也达到最佳,并且合金的腐蚀电位明显正移达到-1.02V。Y的添加量从1.2%增加到1.8%时,合金的腐蚀电位变化不大,力学性能也有所下降。The S4800 scanning electron microscope with energy spectrometer, D8 Focus X-ray diffractometer, AG-10TA electronic universal testing machine and electrochemical station were employed to investigate systematically the effects of Y addition on the micrestructure, the mechanical properties at room temperature and high temperature （ 175 ℃ ） and corrosion resistance of AM60B magnesium alloy. Experimental results indicate that the thermodynamically stable new phase Al2Y is formed after Y addition to the AM60B alloys, and distribution of Mg17Al12 is changed from reticulation to dispersed state. When the addition amount of Y was 0.6%, both the mechanical properties and corrosion resistance of the alloy were enhanced. There were obviously diffraction peaks of Al2Y phase in XRD patterns when the addition amount of Y was 1.2%, the high temperature （ 175 ℃ ） tensile strength of the alloy reaches 147 MPa and the room-temperature tensile strength also reached the best. At the same time, the corrosion potential of alloy increased to -1.02 V. With Y content increasing from 1.2% to 1.8%, the corrosion potential of alloy had no obvious change while the mechanical properties decreased.

关 键 词：AM60B镁合金 钇 显微组织 力学性能 腐蚀性能 

分 类 号：TG113[金属学及工艺—物理冶金]