原位生成TiAl3 / 7075铝基复合材料的热力学及动力学分析
Thermo-dynamics and Kinetics Analysis of In-situ Synthesized TiAl3 / 7075 Composite
陈小会, 闫 洪, 揭小平
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作者单位：(南昌大学 先进成型制造及模具研究所, 江西 南昌 330031)
中文关键字：原位生成； TiAl3； 铝基复合材料； 热力学； 动力学
英文关键字：in-situ synthesis; TiAl3; aluminum matrix composite; thermo-dynamics; kinetics
中文摘要：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。
英文摘要：TiAl3/7075 aluminum matrix composite was successfully prepared by in-situ synthesis through the addition of titanium powder (Ti) and cryolite (Na3AlF6). The microstructure and phase composition of the composite was investigated by OM, XRD and EDX. The forming mechanisms of the composite were researched based on the two aspects, thermo-dynamics and kinetics. The results show that the microstructure of the composite is composed of α-Al phase, T-Mg32(Al, Zn)49 phase and TiAl3 reinforcement. Ti and Al melt can spontaneously generate TiAl3 reinforcement and the reactive kinetics is mainly controlled by system temperature, Ti particle size and the thickness of external diffusion layer.