Abstract
Analysis of the exothermic peaks obtained at different heating rates during continuous heating in a differential scanning calorimeter of a quenched B2-structured Fe-40 at.% Al single crystal yielded a value for the activation energy for vacancy annihilation of 131 ± 8 kJ mol -1 , which is very close to the accepted value. Having shown the utility of this method, it was used to determine the activation energies associated with the annihilation of antiphase-boundary (APB) tubes from cold-rolled Fe-40 at.% Al and Fe-43 at.% Al single crystals. The activation energies obtained were 101 ± 9 kJ mol -1 and 67 ± 9 kJ mol -1 respectively. Magnetic measurements showed that the rolled Fe-43 at.% Al specimens need less time and a lower temperature to anneal out the APB tubes produced during rolling compared with Fe-40 at. % Al specimens, consistent with the lower activation energy in this alloy.
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