Interfaces in intermetallic matrix composites

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:62963

Xu, K; Wang, L; Arsenault, R J ^[1]

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1. Univ. of Maryland, College Park, MD (United States). Dept. of Materials and Nuclear Engineering

It is well known that the nature of the interface between the reinforcement and the matrix has a very important role in determining the mechanical properties of the composites. However, there are other unusual and important aspects of the interface. An intriguing observation concerning particulate TiB{sub 2}NiAl composites is the lack of dislocation generation due to cooling from high temperature (1673 K) annealing. The predicted thermal residual stress should be very large and this stress should be relieved by dislocation generation. It is possible that an interface layer exists between the TiB{sub 2} and NiAl which can act as a stress absorber. Also, in the case of continuous filament Al{sub 2}O{sub 3} there can be differences in the bond strength between the filament and the matrix. There is no interface layer between the Al{sub 2}O{sub 3} or TiB{sub 2} and NiAl interface, which can act as a stress absorber. In the case of continuous filament Al{sub 2}O{sub 3}/NiAl was degraded by graphite decorations at the interface. An unusual diffraction modulation was observed in the Al{sub 2}O{sub 3} filament, and this could be modeled by an FEM analysis.

• OSTI ID: 62963
• Report Number(s): CONF-941016--; ISBN 0-87339-247-7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
DISLOCATIONS
FINITE ELEMENT METHOD
INTERFACES
MICROSTRUCTURE
NICKEL ALLOYS
RESIDUAL STRESSES
SEGREGATION
TITANIUM BORIDES
TRANSMISSION ELECTRON MICROSCOPY