Mg-Al-Ti体系原位合成A13Tip／Mg.pdfVIP

第l8卷第4期 中国有色金属学报 2008年4月 、b1．18 No．4 The Chinese Journal of Nonferrous Metals Apr．2008 文章编号：1004．0609(2008)04—0583．06 Mg-AI-Ti体系原位合成Al3Tip／Mg 高明娟 ，王树奇 ，杨子润 ，崔向红 ，陈康敏 (1．江苏大学 材料科学与工程学院，镇江 212013； 2．吉林大学 材料科学与工程学院，长春 130022) 摘 要：采用Miedema生成热模型，通过计算机编程计算出Mg-AI-Ti体系可能析出的热力学平衡相为Al-Ti金属 问化合物，吉布斯自由能计算结果表明A1．Ti系中主要析出Al3Ti金属间化合物，由此可预测Mg-AI．Ti体系Al3Ti 金属间化合物的形成。采用原位合成法对Mg一(11％ 8％)A1．(3％一l4％)Ti进行反应烧结，利用x射线衍射仪、扫 描电镜和能谱仪等方法分析物相和显微组织形貌，发现在Mg基体中，均匀地析出颗粒状Al3Ti金属间化合物， 尺寸约为2~4 pm，且增强相与基体结合紧密。与镁合金相比，A13Tic~g具有较高的硬度和较好的耐磨性。 关键词：Al Ti金属间化合物；Mg-AI-Ti体系；Miedema生成热模型；热力学平衡相 中图分类号：TG l11．5 文献标识码：A Al3Tip／Mg developed by in situ synthesis of Mg·-AI·-Ti system GAO Ming-juan ，WANG Shu-qi。，YANG Zi-run ，CUI Xiang．hong2，CHEN Kang．min (1．School ofMaterial Science and Engineering，Jiangsu University,Zhenjiang 212013，China； 2．School ofMaterials Science and Engineering，Jilin University,Changchun 130022，China) Abstract：The thermodynamics equilibrium phases of Mg-AI-Ti system were worked out to be AI-Ti intermetallics by computing program of Miedema’S mode1．Th e result of Gibbs’free-energy demonstrates that Al3Ti is predominant product in Al-Ti system．The in-situ composite Was fabricated through reactive sintering of Mg—fl1％-28％)A1- (3％-14％)Ti．The phases and microstmcture of the composites were analyzed by X-ray diffraction(XRD)，scanning electron microscopy(SEM)and energy dispersive spectrometer(EDS)．The fme particulates of AI3Ti、Ⅳith size of 2—4 pm distribute uniformly in magnesium matrix and combine closely、^rim the matrix．Compared to magnesium alloy,the hardness and wear resistance of the AI3Ti-reinforced Mg matrix composi~are obvio