钇对AM60B镁合金显微组织和性能的影响.pdfVIP

学兔兔 Jun．2009 铸 造 VOI．58 NO．6 FOUNDRY 钇对AM60B镁合金显微组织和性能的影响 冒国兵，张光胜，孙宇峰，刘 琪 (安徽工程科技学院杌械工程系，安徽芜湖241000) 摘要：采用扫描电子显微镜 (SEM)、 j之衍射仪(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℃)0 ．-陛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Mg。7A1。：相分布，使得Mg．7Al ：相由网状分布向颗粒状改变。Y加入量为O．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一1．O2V。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。 关键词：AM60B镁合金；钇；显微组织；力学性能；腐蚀性能 中图分类号：146．T2 文献标识码：A 文章编号：1001—4977(2009)06—0607—04 Effect Of Y1}Irium Addition on Microstructure and Properties of AM60B Magnesium Alloy MAO Guo-bing，ZHANG Guang—sheng，SUN Yu-feng，LIU Qi (Department of Mechanical Engineering，Anhui University of Technology and Science Wuhu 241 000，Anhui，China) Abstract：The$4800 scanning electron microscope with energY spectrometer．D8 Focus X—ray diffractometer．AG-1 0TA electronic universaI testing machine and electrochemical station were employed to lnvestigate systematically the effects of Y addition on the microstructure。the mechanicaI properties at room temperature and high temperature(1 75℃ ) 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 Mg17AI12 iS changed from reticulation to dispersed state．When the addition amount of Y was 0．6％。both the mechanicaI properties and corrosion resistance of the alloy were enhanced．There were obviously djf『raction peaks of AI2Y phase in XRD pattern