Synthesis of Ni{sub 3}Al and NiAl intermetallics
- Oak Ridge National Lab., TN (United States)
- Xform, Inc., Cohoes, NY (United States)
Intermetallics are an attractive class of advanced materials. The aluminide intermetallics offer advantages including: (1) lower density, (2) oxidation resistance, (3) carburization resistance, and (4) interesting mechanical properties because of their ordered crystal structure. Even though the attractive properties of the aluminides and other intermetallics have been known for nearly four decades, their practical applications have not been developed for two reasons: (1) poor ductility (in some cases at both ambient and high temperatures) and (2) lack of processability into meaningful components. Recent advances such as ductilization of Ni{sub 3}Al by small additions of born and the knowledge that environmental effects are the major cause of poor ductility in Fe{sub 3}Al and FeAl systems have brought the intermetallics into the forefront of research and their commercial applications. This paper describes a method for melting Ni{sub 3}Al-based alloys that successfully utilize the exotherm for formation of NiAl from elemental materials. The reaction-synthesis method has also been utilized for the production of NiAl and NiAl-based alloy powders from the elemental powders. Reaction-synthesized powders of NiAl and NiAl-based alloys were consolidated by hot extrusion and evaluated for tensile properties over a temperature range from room temperature to 1050 C. The powder-processing conditions have been found to have more influence on the ductile-to-brittle transition temperature of NiAl than the powder- production method.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10113128
- Report Number(s):
- CONF-941016-5; ON: DE95005897
- Resource Relation:
- Conference: Materials week `94, Rosemont, IL (United States), 3-7 Oct 1994; Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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