Annealing effects on the reordering of severe plastic deformed boron doped Ni3Al

X-ray diffraction (XRD) and differential scanning calorimetry (DSC) were used to investigate the reordering process of a partially disordered Ni76Al24 (0.2 wt.%B) powder with annealing times and temperature. The long-range order parameter varied linearly with temperature and a significant ordered state was observed at 773 K. The DSC measurements showed one main exothermal peak in the temperature range of 493–913 K. The maximum rate of energy release occurred at 763 ± 2 K with a total thermal effect of ΔH = 52 ± 9 j/g. The DSC peak showed a shoulder around its maximum temperature of 763 ± 2 K which was attributed to order stabilization. The presence of boron in the alloy enhanced the transformation temperature by increasing the enthalpy of vacancies migration without affecting the reaction enthalpy.