The formation of γ phase has been studied in an approximately equiatomic Fe-Co. alloy containing 2%V. The high-temperature α1 (bcc)/α1 + γ1(fcc) and α1 + γ1/γ1 phase boundaries lie in the temperature ranges 1123–1148 K and 1173–1223 K, respectively. Metastable α1 aged between 750 and 900 K, orders to a B2 superlattice (α2) and the γ2 phase subsequently precipitates preferentially on the antiphase domain boundaries. In material deformed 25% or 50% by cold rolling before ageing, γ2 precipitation is more rapid and takes place on dislocations and subgrain boundaries. The γ2 phase exhibits an ordered L12 structure and grows as rods in the 〈111〉α2.
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