(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-Al-Ti体系可能析出的热力学平衡相为Al-Ti金属间化合物，吉布斯自由能计算结果表明Al-Ti系中主要析出Al3Ti金属间化合物，由此可预测Mg-Al-Ti体系Al3Ti金属间化合物的形成。采用原位合成法对Mg-(11%~28%)Al-(3%~14%)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 μm，且增强相与基体结合紧密。与镁合金相比，Al3Tip/Mg具有较高的硬度和较好的耐磨性。
关键字: Al3Ti金属间化合物；Mg-Al-Ti体系；Miedema生成热模型；热力学平衡相
（1. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China;2. School of Materials Science and Engineering, Jilin University, Changchun 130022, China）
Abstract:The thermodynamics equilibrium phases of Mg-Al-Ti system were worked out to be Al-Ti intermetallics by computing program of Miedema’s model. The 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-(11%−28%)Al- (3%−14%)Ti. The phases and microstructure of the composites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS).The fine particulates of Al3Ti with size of 2−4 μm distribute uniformly in magnesium matrix and combine closely with the matrix. Compared to magnesium alloy, the hardness and wear resistance of the Al3Ti-reinforced Mg matrix composite are obviously enhanced.
Key words: Al3Ti intermetallic; Mg-Al-Ti system; Miedema model; thermodynamics equilibrium phases
