Kinetics of ordering in Fe3Al

Abstract
The resistance changes produced by thermal treatment of Fe3Al have been measured and the annealing kinetics analysed. It was found that an increase in long-range order produced a large decrease in resistance. It was found that the rate at which ordering takes place is a function of the initial quenching temperature. All curves were fitted to the standard rate equation giving an order of reaction n=2.2 for specimens quenched from 620°c and n =1.5 for specimens quenched from 530°c. The activation energy obtained from resistivity kinetics was found to be much lower than the mean activation energy for diffusion.