The temperature dependence of the antiphase boundary energy in Ni₃Fe I. The equilibrium value

Abstract

The equilibrium value γ of the antiphase boundary (APB) energy in Ni₃Fe as function of temperature is determined by measuring the equilibrium separation of the two unit dislocations which border the APB. It is found that γ decreases more strongly at higher temperatures than predicted by theoretical estimates and γ vanishes approximately at the ordering temperature T_e From the time interval to reach equilibrium it can be concluded that the decrease in γ is due to atomic rearrangement which is more pronounced at higher temperatures.