Liquidus and solidus temperatures of Ni-solid solution in Ni-Al-X (X : V, Nb and Ta) ternary systems

A systematic investigation was carried out to determine both liquidus and s olidus surfaces of the Ni-solid solution (gamma) in the Ni-Al-X ternary pha se diagrams successively by differential thermal analysis (DTA) technique. Each of the Group V elements of the periodic table, V, Nb, and Ta, was chos en as a ternary additive X in the present study. The gamma -solvus was also taken into account in determining a temperature range for a solid solution treatment above the gamma -solvus, i.e., "the window," as well as the maxi mum solubility limit of gamma -Ni solid solution.