Abstract
Ceramics and ceramic composites are subject to creep rupture at elevated temperatures. The rupture strain in such materials has been shown to exhibit a major transition, from creep brittleness to creep ductility. The emphasis of the present article is on the definition of microstructures that provide ductility. For this purpose, the fundamental principles involved in high temperature flow and fracture are reviewed, and physical models of the ductile-to-brittle transition are presented. The mechancial phenomena involved in these considerations include: creep crack growth, crack blunting, flaw nucleation and stress corrosion.
Published Version
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