Self-climb of dislocation loops in magnesium oxide
- 1 November 1972
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 26 (5), 1179-1190
- https://doi.org/10.1080/14786437208227372
Abstract
Quantitative measurements were made of self-climb of dislocation loops, b = 1 2, in magnesium oxide single crystals. The rate of motion of pairs of co-planar loops was studied by repeated observation of the same areas of a thin foil during a series of annealing treatments. Values 60 300±3500 cal/mol for the activation energy for pipe diffusion and (7·5±4·3) × 10−18 cm4/sec for the pre-exponential term D P o a P were obtained. The experiments show that up to about 1250°C self-climb is a primary mechanism by which average loop size increases during annealing of plastically deformed magnesium oxide.Keywords
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