Microstructural Design for Improved Mechanical Behaviour of Advanced Materials
J. Phys. IV France 10 (2000) Pr6-163-Pr6-163
Dislocation pinning by glissile interstitial loops in a FCC nickel crystal. A molecular dynamics studyD. Rodney1 and G. Martin1
1 CEA-Saclay, CEREM, Section de Recherches de Métallurgie Physique, 91191 Gif-sur-Yvette , cedex, France
Molecular dynamics simulation show that, in an embedded atom method nickel crystal, interstitial loops made of <110> dumbbells may be absorbed by an edge dislocation in two distinct configurations, either beeing attached to one of the Schockley partials by means of a dislocation junction, or beeing transformed into a superjog on the dislocation. In both cases, the absorption is assisted by a flip of the Burgers vector of the loop. The simulations also show that double superjogs lock the dislocation and induce an additionnal friction on the latter, the amplitude of which is evaluated from the simulation.
© EDP Sciences 2000