Two-phase nickel aluminidesThe as-extruded microstructures of two alloys in the two phase field consisting of Ni3Al and NiAl in the Ni-Al phase diagram exhibit fibrous morphology and consist of Ll(2) Ni3Al and B2 NiAl. These as-extruded microstructures can be modified dramatically by suitable heat treatments. Martensite plus NiAl or martensite plus Ni3Al microstructures are obtained upon quenching from 1523 K. Aging of martensite at 873 K results in the recently identified phase Ni5Al, whereas aging at 1123 K reverts the microstructures to Ni3Al plus NiAl. The microstructures with predominantly martensite of Ni5Al3 phases are brittle in tension at room temperature. The latter microstructure does not deform plastically even in compression at room temperature. However, some promise of room temperature tensile ductility is indicated by the Ni3Al plus NiAl phase mixtures.
Document ID
19880044437
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Khadkikar, P. S. (Case Western Reserve Univ. Cleveland, OH, United States)
Vedula, K. (Case Western Reserve University Cleveland, OH, United States)
Shabel, B. S. (Alcoa Laboratories, Alcoa Center PA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
Metallic Materials
Meeting Information
Meeting: High-temperature ordered intermetallic alloys II