SEDL / STP / STP339-EB / STP41273S

Identification of Phases in Age-Hardenable Nickel-Copper-Aluminum-Titanium Alloy

Fragetta, W. A.
Curtiss-Wright Corp., Wood-Ridge, N. J.

Mihalisin, T. R.
Research Laboratory, The International Nickel Co., Inc., Bayonne, N. J.

Pages: 4    Published: Jan 1963

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Abstract

Previous investigations of the microstructure and age-hardening characteristics of commercial nickel-base superalloys were concentrated on the nickel-chromium alloys hardened with aluminum and titanium. The age-hardening phases in these alloys are of the gamma prime type based on the ordered Ni³Al structure, or the eta type based on the ordered hexagonal structure Ni³Ti (I), although it has been shown that Ni³Ti can have a face-centered cubic structure under nonequilibrium conditions (2).