In order to study the phase diagram of the ternary Fe-Ti-V system, the isothermal sections at 1 000 8C and 1 200 8C have been determined. The nature and composition of the phases involved in the different equilibria were investigated by means of X-ray powder diffraction and electron probe microanalysis. More than 15 at.% Fe could be substituted in the body centered cubic Ti-V solid solution at both temperatures. The C14, Fe 2 Ti-derived phase extends to the composition Ti 33 V 33 Fe 33 . A linear regression between the lattice parameter and the composition of the studied body centered cubic phase is proposed. The data provided by the isothermal sections, together with the differential thermal analysis measurements, highlighted the presence of a quasi-peritectic reaction U, and a tentative liquidus projection is presented, based on a metallographic analysis.

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