Influence of Mechanical Activation on Decomposition of Titanium Hydride

TiH(2) particles were mechanically activated up to 10 h. Differential scanning calorimetry (DSC) was used for the kinetic studies. It shows the activation energy required for TiH(x) to alpha-Ti transformation is 140 kJ/mol. The mechanism of decomposition and the influence of particle size on transformation temperature as well as the sequence have been studied, based on detailed isothermal heat treatments at various temperatures followed by X-ray diffraction (XRD) studies. Results suggest that mechanical activation has a strong influence in decreasing the transformation temperatures as well as the temperature difference between the first step and second step transformation process.