Abstract
Available experimental evidence on the constitution of the Co-Fe-V system has been critically reviewed. A projection of the liquidus surfaces is recommended, involving primary separation of the γ-phase (solid solution of Fe and V in Co), the α-phase (solid solution of Co and V in the αδFe-phase of the Fe-V system), and the δ-phase. Isothermal sections, partial in some cases, are presented for temperatures ranging from 1300°to 900°C, and emphasize the importance of the a-phase. No ternary compounds have been reported. In alloys with less than 20% V which are subject to the γ/α transformation on cooling or heating, an approach to equilibrium is only obtained after very long annealing treatments, and diagrams are therefore given for both equilibrium and non-equilibrium conditions at approximately 600°C. In view of its importance, the course of the γ/α transformation in alloys poor in V is also reviewed.
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