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The nucleation and growth of voids in a material containing a distribution of grain-boundary particles

✍ Scribed by A.C.F. Cocks

Publisher: Elsevier Science
Year: 1985
Weight: 1015 KB
Volume: 33
Category: Article
ISSN: 0001-6160
DOI: 10.1016/0001-6160(85)90226-3

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✦ Synopsis

Void growth is analysed when a grain boundary contains a distribution of second phase particles. The rate of void growth is determined by the ease with which material can plate out around the particles or the rate at which the material surrounding the particln can deform by power-law creep. At low applied stresses, stress is concentrated onto the particles which can act as nucleating sites for new cavities. The stress at a particle is a function of its size, and increases as the area fraction of voids increases. A new cavity can nucleate once this stress reaches a critical value, and because materials contain a distribution of particle sizes, nucleation occurs continuously during the course of an experiment.

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