Deformation texture of hydrostatically extruded polycrystalline NiAl

Journal Article · Wed Dec 15 04:00:00 EST 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90293-2· OSTI ID:6007529

Margevicius, R W ^[1]; Lewandowski, J J ^[2]

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1. Los Alamos National Lab., NM (United States)
2. Case Western Reserve Univ., Cleveland, OH (United States). Dept. of Materials Science and Engineering

NiAl is currently a candidate for high temperature structural applications because of its high melting temperature, low density, and excellent oxidation resistance. Polycrystalline NiAl possesses low ductility at ambient temperatures, but it has a brittle-to-ductile transition temperature (BDTT) of approximately 573 K (1,2). Its high melting temperature, however, puts limits on its formability, usually requiring it to be processed at high temperatures. High temperature processing can lead to diffusive effects which may nullify the benefits of deformation processing. Processing of NiAl at lower temperatures, yet above its BDTT, might yield the conditions necessary for large amounts of strain to be attained from processing but might also limit the amount of diffusion related phenomena that would occur either during or following high temperature deformation. Deformation textures give insight into the modes of deformation that result from processing. When extruded below approximately 1,173 K, NiAl typically develops a (110) fiber texture. When extruded at higher temperatures or subsequently annealed, a (111) recrystallization temperature develops. The first successful low temperature hydrostatic extrusion of NiAl has been reported recently. It is the purpose of this paper to give the details of the resulting deformation texture and relate it to the potential benefits of processing of NiAl with the use of hydrostatic pressure.

• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6007529
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:12; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
BINARY ALLOY SYSTEMS
CRYSTALS
DEFORMATION
HYDROSTATICS
NICKEL ALLOYS
POLYCRYSTALS