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Characteristics of creep deformation in ceramics

Atul H. Chokshi, Terence G. Langdon

Abstract

The creep mechanisms in ceramics are reviewed briefly and then compared with experimental data. It is shown that there are three major types of creep behaviour: a stress exponent close to 5 due to control by dislocation climb and fully ductile behaviour; a stress exponent close to 3 due to control by climb from Bardeen–Herring sources and less than jive interpenetrating independent slip systems; and a stress exponent close to 1 due to diffusion creep. The role of interface reaction control and the transitions from diffusion to power law creep are also examined.MST/1389

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Key concepts: Climb, Creep, Materials science, Diffusion creep, Dislocation creep, Exponent, Ceramic, Stress (linguistics)