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The phase boundary separating the γ + γ′ and γ′ regions of the Ni –Al phase diagram (the γ solvus) was established over the temperature range 600– 1200 °C. The γ phase is the Ni –Al solid solution, and γ′ is (non-stoichiometric) Ni 3 Al. Cast alloys containing 22.0, 22.2, 22.4, 22.6, 22.8 and 23.0 at.% Al, all compositions being within ± 0.03 at.%, were used in the experiments. At temperatures from 1000 to 1200 °C, the γ solvus was determined using aging treatments designed to eliminate the dendritic structure in the as-received castings. At lower temperatures, from 600 to ≈ 900 °C, dissolution experiments were conducted. The method takes advantage of the absence of a barrier to the dissolution of a dispersed phase. Specimens of the supersaturated γ′ phase were aged at low temperatures, 600 or 650 °C, for long times (up to 633 h), to produce fine dispersions of the coherent γ phase precipitates. These specimens were then re-aged at 10 –20 °C intervals of temperature and re-examined to determine whether the γ phase precipitates had dissolved. The absence of the γ phase precipitates enabled the phase boundary to be located to within ± 10 °C for an alloy of known composition, or ± 0.03 at.% at a given temperature, from 600 to 900 °C. The phase boundary generally agrees with the lower end of Al concentrations established in previous research.

The ( γ + γ ′ )/ γ ′ phase boundary in the Ni–Al phase diagram from 600 to 1200 ° C