Formation of Diamond-Shaped Prismatic Loops in Quenched fcc Metals
- 1 November 1963
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 34 (11) , 3363-3367
- https://doi.org/10.1063/1.1729193
Abstract
The concept of dissociated prismatic dislocation loops is proposed to explain the formation of diamond‐shaped loops observed in several metals after quench aging. The dissociated prismatic loop is composed of parallel segments on {111} planes having a/6 Burgers vectors. It is shown that diamond‐shaped loops form from either a triangular or hexagonal Frank loop, and once formed can rotate on the glide cylinder to any orientation between and including {111} and {110}. Climb kinetics are qualitatively discussed in terms of the equilibrium separation of partials. The separation is approximately equal to the core radius (2|b|) in Al, but is large enough in Cu (∼12|b|) to be experimentally detected. These considerations may explain why large loops are not often observed in metals other than aluminum.This publication has 17 references indexed in Scilit:
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