Processing and mechanical properties of Ni sub 3 Al-based intermetallic composites

Conference · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5882218

Sikka, V K; Ohriner, E K; Allard, L F

The fabrication, microstructures, and properties of nickel-aluminide-based composites are described. In all cases, the composites were examined as-fabricated and after exposure for 100 h at a temperature of 1100{degrees}C. The thermal exposure was used to check for reactions and thermal stability of the reinforcement. The thermally stable and inert reinforcements for the Ni{sub 3}Al matrix are NbC, TiC, HfN, and TiN. The TiC composite through XD{trademark} addition appears to enhance the cast properties at room temperature and high temperature, and can probably be used for certain cast applications. The most recent work on Ni{sub 3}Al-based composites using NbC, HfN, and TiN particulates showed no significant strengthening. Thus, the only hope for beneficial reinforcement appears to be the TiC through XD{trademark} addition. All of the fabrication methods described appear to be viable processes for making Ni{sub 3}Al-based composites. Recent data confirms that TiC additions to Ni{sub 3}Al via powder metallurgy increases its strength at both low and high temperatures. Thus a combination of the present study and the published data suggest that the Ni{sub 3}Al composites containing TiC have a potential for commercial use in either cast or wrought condition. 8 refs., 4 figs., 6 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5882218
• Report Number(s): CONF-910343-1; ON: DE91009932
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
FABRICATION
INTERMETALLIC COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
REINFORCED MATERIALS
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE