Processing and Mechanical Properties of A1203/Ni3AI Composites with Interpenetrating Network
S Skirl, Ralph Krause, Sheldon M. Wiederhorn, J Rodel
Composites with microstructures of interpenetrating networks were manufactured by gas pressure infiltration of the Ni3Al into porous preforms of aluminum oxide. Composites with contents of Ni3Al contents of between 15% and 30% by volume were made and evaluated mechanically at temperatures between room temperatures 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 Ni3Al contents had strengths below 400 MPa, presumably due to microcracking along the interface between the Ni3Al and the Al2O3. The composites with the highest content of Ni3Al, 30 by 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.m1/2.
, Krause, R.
, Wiederhorn, S.
and Rodel, J.
Processing and Mechanical Properties of A1203/Ni3AI Composites with Interpenetrating Network, Journal of the American Ceramic Society
(Accessed May 30, 2023)