Intermetallic compound precipitation in Ni–Cr–Al–Mo system

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Abstract
The constitution of the Ni–Cr–Al–Mo system has been investigated at 1273 and 1073 K using alloys containing 60 and 50 at.-%Ni. The alloys were initially annealed at 1523 K, resulting in structures containing combinations of two or three of the phases: γ (nickel-base solid solution), γ′ (based on Ni3Al), β (based on NiAl), σ, P, and Mo–Cr base solid solution. On annealing at 1273 and 1073 K, equilibrium conditions were not achieved but the solid state transformations occurring during the approach towards equilibrium included the fine scale precipitation of σ- and P-phases. Data are reported of phase compositions determined by electron probe microanalysis and by energy dispersive X-ray analysis of thin foils. The γ/γ′ mismatch values in the alloys studied ranged from −0·17 to −0·75%. MST/605