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 exo-thermal peak in the temperature range of 493-913 K. The maximum rate of energy release occurred at 763 +/- K with a total thermal effect of Delta H = 52 +/- 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.