An analysis was made of the exothermic peaks which were obtained at various heating rates during the continuous heating, in a differential scanning calorimeter, of a quenched B2-type Fe-40at%Al single crystal. This yielded a value, of the activation energy for vacancy annihilation, of 131kJ/mol. This was very close to the accepted value. The method was then used to determine the activation energies which were associated with the annihilation of antiphase boundary tubes in cold-rolled Fe-40at%Al and Fe-43at%Al single crystals. The resultant activation energies were 101 and 67kJ/mol, respectively. Magnetic measurements showed that the rolled Fe-43at%Al specimens required shorter times and lower temperatures for the annealing out of the antiphase boundary tubes which were produced during rolling; as compared with Fe-40at%Al specimens. This was consistent with the lower activation energy in this alloy.

The Activation Energies of Antiphase-Boundary Tube Annihilation in Fe-Al. D.Wu, I.Baker: Philosophical Magazine A, 2002, 82[11], 2239-47