Constitutive Equations for the Creep of a Silicon Carbide Whisker‐Reinforced Polycrystalline Alumina Composite Material


The θ‐projection parametric method is used to analyze the creep strain‐versus‐time data, obtained in four‐point flexure, for a 25 wt% silicon whisker‐reinforced polycrystalline alumina composite material. The results, used in conjunction with a suggested value of the activation energy for the creep‐rate‐controlling process for this material of about 620 kJ/mol, led to a postulate that grain‐boundary sliding is the rate‐determining mechanism. In addition, the use of the results in obtaining the values of relevant design creep parameters (namely, life or strain) is illustrated. Copyright © 1992, Wiley Blackwell. All rights reserved

Publication Title

Journal of the American Ceramic Society