High temperature oxidation of Ni sub 3 Al composites

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:7173338

Tortorelli, P F; DeVan, J H; McKamey, C G; Howell, M

As part of an effort to develop oxidation-resistant metal matrix composites, the influence of reinforcement materials on the oxidation of Ni{sub 3}Al was studied. Thermogravimetric measurements and microstructural analyses were used to determine the 800{degree}C oxidation behavior of Ni{sub 3}Al and composites based on this material. The presence of fiber (Al{sub 2}O{sub 3})- or particle (TiN or TiC)- reinforcement material in the Ni{sub 3}Al increased susceptibility to oxidation as measured by the amount of reacted material, rate constants, and/or extent of internal attack. The orientation of fibers with respect to the free surfaces was found to affect the oxidation behavior by providing, in certain cases, reactive paths along the fiber-matrix interface that led to significant internal penetration. The results suggest that the choice of reinforcement material and the method of materials processing will be important considerations in the design of oxidation-resistant Ni{sub 3}Al composites. However, ways to minimize the detrimental influence of the reinforcement material on oxidation resistance often conflict with requirements for obtaining attractive mechanical and physical properties of the composite. 13 refs., 6 figs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/CE; DOE/ER
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7173338
• Report Number(s): CONF-900466-17; ON: DE90010145
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
FIBERS
INTERMETALLIC COMPOUNDS
MATERIALS
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
NITRIDES
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
REINFORCED MATERIALS
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TITANIUM NITRIDES
TRANSITION ELEMENT COMPOUNDS