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Dislocation patterning and recovery under single slip: modelling micromechanisms from observations

Published online by Cambridge University Press:  15 February 2011

Patrick Veyssière,
Yu-Lung Chiu and
Fabienne Grégori
Patrick Veyssière
Affiliation:
LEM, CNRS-ONERA, BP 72, 92322 Châtillon cedex, France.
Yu-Lung Chiu
Affiliation:
LEM, CNRS-ONERA, BP 72, 92322 Châtillon cedex, France.
Fabienne Grégori
Affiliation:
LPMTM, Institut Galilée, 99 Av. J. B. Clément, 93430 Villetaneuse, France.
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Abstract

The paper focuses on the formation and on the role of prismatic loops during deformation. The analysis is restricted to non-diffusive processes in fcc-related crystals. Double cross-slip and cross-slip dipolar annihilation yield strings of loops such that one loop extremity is aligned in the screw direction with the extremity of its nearest neighbour. Reactions between prismatic loops and mobile dislocations are at the origin of a number of microstructural reactions including recovery, dislocation entanglements and patterning in single slip, dislocation multiplication and there is indication that they may nucleate twins.

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