Processing and Mechanical Properties of Al 2 O 3 /Ni 3 Al Composites with Interpenetrating Network Microstructure
Year: 2001
Type: article
Abstract: Composites with microstructures of interpenetrating networks were manufactured by gas pressure infiltration of Ni 3 Al into porous preforms of aluminum oxide. Composites with Ni 3 Al contents of between 15% and 30% by volume were made and evaluated mechanically at temperatures between room temperature and 1000°C. The fracture strength, the fracture toughness, Young's modulus, and the thermal expansion coefficient were measured for each composite and test condition and were correlated with the microstructures of the composites. Composites with low Ni 3 Al contents had strengths below 400 MPa, presumably due to microcracking along the interface between the Ni 3 Al and the Al 2 O 3 . The composite with the highest content of Ni 3 Al, 30 vol%, had a mean fracture strength of 675 ± 16 MPa, a Weibull modulus of 23.9, and a room‐temperature toughness of 9.2 ± 0.5 MPa·m 1/2 .
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1965748883