中文摘要：

研究了Ti/Al热处理温度为520-630℃之间不同温度条件下的固相扩散反应,实验选用Ti/Al粉末压坯作为研究TiAl3金属间化合物反应动力学模型的原始材料,当热处理时间达到46 h条件下,TiAl3金属间化合物相在Ti/Al界面生成,实验结果显示TiAl3相沿TiAl3/Al界面的生长速率明显优于沿Ti/TiAl3界面的生长速率。此外,建立了TiAl3固相扩散反应动力学方程,Ti/Al固相扩散反应激活能和动力学指数分别为170.1 k J·mol^-1和0.5。通过对不同热处理条件下试样进行成分分析得到,在热处理工艺为590℃/4.5 h条件下,铝完全消耗,而590℃/3.5 h条件下仍有多余的铝剩余,该实验结果与所建立的固相反应扩散动力学模型相一致,表明该模型能够很好地预测Ti/Al材料固相反应的进行状态。

英文摘要：

The solid phase diffusion reaction behavior between Ti and Al was characterized from 520 ℃to 630 ℃ for different annealing time with titanium and aluminum being superfluous. When the samples are annealed up to 46 h, only intermetallic TiAl3 phase forms and grows at the Ti/Al interface. It can be found that the growth rate of TiAl3 towards TiAl3/Al interface is more rapid than that towards Ti/TiAl3 interface. Additionally, the solid-state diffusion reaction kinetic equation of TiAl3 was successfully established in the present work. The reaction activation energy of Ti/Al is calculated to be 170.1 kJ ·mol^-1 and dynamic index n is 0.5. Hence, the growth of TiAl3 is controlled by normal parabolic law with annealing time. Ti/Al powder compact was employed as experiment material to identify the proposed reaction kinetic equation for the growth of TiAl3. It is suggested that no extra aluminum is found in the specimen annealed at 590 ℃/4.5 h, while the aluminum is still found at 590 ℃/3.5 h, indicating that it is in a good agreement with the developed solid-phase diffusion reaction equation.