Abstract
Single-phase Ti 3Al having DO 19 structure (hexagonal) was hydrogenated by gas charging at a pressure of 3.8 MPa. The stoichiometry of the hydrogenated sample was found to be Ti 3AlH 4.76. From X-ray diffraction (XRD) measurements it was found that there were two different hydride phases with fcc and hcp crystal structures. By differential scanning calorimetry (DSC) and XRD measurements the decomposition temperatures of the two hydride phases were identified. It was found that the hexagonal hydride phase is more stable compared to the cubic hydride phase. The decomposition kinetics of the hydride phases were analysed using the DSC data and the decomposition mechanism and the kinetic parameters were obtained.
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