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

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 Te 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.