2010 Volume 96 Issue 6 Pages 386-391
The effect of Ti addition on phase equilibria among Ni (A1), Ni3Al (L12) and Ni3V (D022) phases at 950°C was investigated by means of TEM/EDS analysis on heat-treated alloys. The three-phase coexisting region of A1+L12+D022 was found to exist around the composition of Ni–4Al–19V (at.%) in the Ni–Al–V ternary system. By addition of Ti into the ternary system the three-phase coexisting region was shifted to the Ni rich side. Ti partitioned most into the L12 phase and least into the A1 phase. These results suggest that the addition of Ti stabilizes the L12 phase against D022 and A1 phases.