EXPERIMENTAL AND THEORETICAL DETERMINATION OF THE METASTABLE FE-V PHASE-DIAGRAM

The Fe-V phase diagram is calculated in the cube-rhombohedron-octahedr on approximation of the cluster variation method for four sets of effe ctive pair interactions that include up to fifth neighbors. Two of the sets of pair interactions were determined using a real space inverse cluster variation method from short-range order intensity data measure d at 1133 and 1473 K in a Fe-19.6%V single crystal. The other two sets of interactions were previously calculated by Sluiter and Turchi in t he Fe3V and FeV systems using electronic structure methods. The result s are compared to experimental data for the metastable phase diagram. The phase diagrams obtained from the short-range order intensity measu rements are in good agreement with the experimental data.