(1. 北京科技大学 材料科学与工程学院，北京 100083；2. 北京航空制造工程研究所，北京 100024)
摘 要: 通过差示扫描量热法(DSC)对钛铝反应进行动力学分析，研究钛铝反应过程和机理。结果表明：钛铝反应包括两个过程：前期是钛(固)与铝(液)直接反应生成TiAl3，反应激活能为(100±10) kJ/mol，后期是TiAl3中的Al通过TiAl、TiAl2和Ti3Al层向Ti中扩散，扩散激活能为(200±10) kJ/mol；若钛铝摩尔比为1:1，最终反应产物为TiAl，其反应速率控制步骤为Ti-TiAl3扩散偶中Al通过TiAl、Ti Al2和Ti3Al层的扩散。
关键字: 钛铝反应；动力学；反应激活能；Kissinger法；Friedman法
（1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 10083, China;
2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China）
Abstract:Kinetic analysis of Ti-Al reaction was conducted through differential scanning calorimetry (DSC), and mechanism of the preparation of titanium aluminides was elucidated. The results show that the reaction of titanium and aluminium involves two processes. First, TiAl3 is the priority generation phase of Ti-Al reaction, and the reaction activation energy is (100±10) kJ/mol. Second, Al element of TiAl3 diffused to Ti through the formed TiAl, TiAl2 and Ti3Al; and the reaction activation energy is (200±10) kJ/mol. However, after fully diffusing of Al, the final stable reaction product depends on Ti/Al atomic ratio. When the Ti/Al atomic ratio is 1:1, TiAl can be obtained.
Key words: Ti-Al reaction; kinetic analysis; reaction activation energy; Kissinger method; Friedman method
