Processing and Mechanical Properties of A1203/Ni3AI Composites with Interpenetrating Network

Published

September 1, 2000

Author(s)

S Skirl, Ralph Krause, Sheldon M. Wiederhorn, J Rodel

Abstract

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.m^1/2.

Citation

Journal of the American Ceramic Society

Volume

84

Issue

No. 9

Pub Type

Journals

Keywords

alumina, aluminum oxide, composites, mechanical behavior, nickel aluminide

Citation

Skirl, S. , Krause, R. , Wiederhorn, S. and Rodel, J. (2000), Processing and Mechanical Properties of A1203/Ni3AI Composites with Interpenetrating Network, Journal of the American Ceramic Society (Accessed April 25, 2024)