A huge difference between the structure and the properties of equilibrium and metastable Fe-Ga alloys along with
an uncertain specification for their metastable state lead to an urgent necessity to understand the cooling rate
role in the formation of the alloys’ structure. We studied the structure of Fe-27%Ga alloy after cooling, in situ
during cooling with different cooling rates and after isothermal annealing up to 300 h between 300 and 575 °C
to report the alloy structure and present, for the first time, the Time-Temperature-Transformation (TTT) diagram
for the metastable bcc to equilibrium fcc transition in this alloy. The critical cooling rates are determined as the
beginning and the end of the formation of equilibrium L12 phase. |
