(1. 江蘇大學(xué) 材料科學(xué)與工程學(xué)院，鎮(zhèn)江 212013；2. 吉林大學(xué) 材料科學(xué)與工程學(xué)院，長春 130022)
摘 要: 采用Miedema生成熱模型，通過計(jì)算機(jī)編程計(jì)算出Mg-Al-Ti體系可能析出的熱力學(xué)平衡相為Al-Ti金屬間化合物，吉布斯自由能計(jì)算結(jié)果表明Al-Ti系中主要析出Al3Ti金屬間化合物，由此可預(yù)測Mg-Al-Ti體系Al3Ti金屬間化合物的形成。采用原位合成法對Mg-(11%~28%)Al-(3%~14%)Ti進(jìn)行反應(yīng)燒結(jié)，利用X射線衍射儀、掃描電鏡和能譜儀等方法分析物相和顯微組織形貌，發(fā)現(xiàn)在Mg基體中，均勻地析出顆粒狀Al3Ti金屬間化合物，尺寸約為2~4 μm，且增強(qiáng)相與基體結(jié)合緊密。與鎂合金相比，Al3Tip/Mg具有較高的硬度和較好的耐磨性。
關(guān)鍵字: Al3Ti金屬間化合物；Mg-Al-Ti體系；Miedema生成熱模型；熱力學(xué)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
