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Constitutive Equations for the Creep of a Silicon Carbide Whisker‐Reinforced Polycrystalline Alumina Composite Material
Author(s) -
Lewis Gladius,
Ostvoll Arnfinn
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04455.x
Subject(s) - creep , materials science , whisker , composite material , silicon carbide , composite number , grain boundary , crystallite , activation energy , strain rate , metallurgy , microstructure , chemistry , organic chemistry
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.