Interfacial reactions between TiB2 and SiC fiber-reinforced Ni3Al composites

Journal Article · Fri May 01 04:00:00 EDT 1992 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(92)90656-Y· OSTI ID:7272740

Brennan, P C; Kao, W H; Yang, J M ^[1]

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1. Aerospace Corp., Mechanics and Materials Technology Center, El Segundo, CA (United States) California, University, Los Angeles (United States)

Interfacial reactions between TiB2 and SiC fibers and Ni3Al matrix were investigated using high-modulus SM 1040 SiC fibers, TiB2/Mo fibers, and TiB2-coated B4C/B fibers in Ni3Al matrix. Chemical compatibility between fiber and matrix was investigated after thermal exposures, followed by analyses using SEM, EDAX, EMPA, and ion microprobe mass analysis. Results showed that the TiB2/Mo fibers reacted with Ni3Al at elevated temperatures much more quickly than did the TiB2-coated B4C/B fibers. TiB2 effectively inhibited Al and Cr diffusion into the B4C fibers. Cracks and porosity within the TiB2 greatly accelerated the diffusion rate of Ni and provided a surface diffusion path for Al and Cr. The SM 1040 SiC fibers were largely consumed during processing, with the formation of complex silicides. 13 refs.

• OSTI ID: 7272740
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 26; ISSN SCRME; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
BORIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
COMPATIBILITY
COMPOSITE MATERIALS
CRACKS
CRYSTAL STRUCTURE
DIFFUSION
ELECTRON MICROSCOPY
FIBERS
INTERFACES
INTERMETALLIC COMPOUNDS
MATERIALS
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
POROSITY
SILICON CARBIDES
SILICON COMPOUNDS
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS