Abstract
Differential scanning calorimetry was applied to the study of high temperature kinetics of TiAl 3 formation from the constituent metal powders. The reaction proceeds at a measurable rate above the melting point of aluminum. The effects of various experimental parameters on the reaction kinetics were determined. The heating rate affects the exothermic reaction temperature. In the temperature range 690–740°C, the rate equation obeys the Prout-Tompkins equation and the activation energy and pre-exponential factor are 149 kJ mol −1 and 1.2×10 6 s −1 respectively. In the temperature range 750–900°C, the rate equation obeys a second-order rate equation with an activation energy of 517 kJ mol −1 and a pre-exponential factor of 1.9×10 23 s −1. These kinetics parameters represent true intrinsic values because they are directly determined by eliminating any heat transfer effects.
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