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以钛粉(Ti)和冰晶石(Na3AlF6)的混合物为加入物,成功制备了原位生成TiAl3/7075铝复合材料。借助光学显微镜、X射线衍射分析及能谱仪观察分析了该复合材料的微观组织和相组成,并从热力学及动力学两个方面分析了该复合材料的形成机理。结果表明,复合材料组织由α-Al、T-Mg32(Al,Zn)49相以及增强相TiAl3组成;Ti与Al熔体可以自发生成TiAl3增强相;影响反应动力学的主要因素为体系的温度、Ti颗粒的起始大小及外扩散层的厚度。
In situ synthesis of TiAl3 / 7075 aluminum composite was successfully prepared with a mixture of titanium powder (Ti) and cryolite (Na3AlF6) as the additive. The microstructure and phase composition of the composites were analyzed by optical microscopy, X-ray diffraction analysis and energy dispersive spectroscopy. The formation mechanism of the composites was also analyzed from two aspects of thermodynamics and kinetics. The results show that the microstructure of the composites consists of α-Al, T-Mg32 (Al, Zn) 49 phase and TiAl3 phase. Ti and Al melt can spontaneously form TiAl3 phase. The main factors affecting the reaction kinetics are the temperature , The initial size of the Ti particles, and the thickness of the outer diffusion layer.