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NASA NTRS1982

Physicochemical investigation of NiAl with small molybdenum additions

Specimens of four cast NiAl alloys, three of them containing 0.5, 1.0 and 1.5 at. % Mo., were homogenized for 10, 10, and 140 hr at 1373, 1523 and 1273 K, respectively, then kept at 1073, 1173 and 1323 K for 60, 120 and 3 hr, respectively, and quenched in icy water. The precipitation of a metastable Ni3Mo phase was observed at temperatures between 1073 and 1523 K. Molybdenum substituted for nickel was found to inhibit the lattice disordering in NiAl at 1073 and 1523 K.

Troshkina, V. A.↗

NASA NTRS1987

Precipitation in a rapidly solidified and aged Ni-Al-Mo alloy

The early stages of decomposition of a highly supersaturated nickel-base alloy have been studied using TEM, SEM, and X-ray diffraction. The material was produced as a metastable solid solution by chill-block melt-spinning. On aging, the material exhibited a number of decomposition products appearing in series or concomitantly. Some of the decomposition products of this alloy, Ni4Mo, Ni3Mo, and Ni2Mo, are related to those found in Ni-Mo binary alloys. Alpha-Mo formed during solidification was distinguished from that formed by precipitation in the solid state by orientation relationships.

Nash, P.↗