Orientation-related twinning and dislocation glide in a Cantor High Entropy Alloy at room and cryogenic temperature studied by in situ TEM straining
Résumé
In situ straining experiments were performed in a TEM on an equimolar CoCrFeMnNi (Cantor) high entropy alloy at room and cryogenic temperature. Perfect and partial dislocation activity were recorded in both cases. Twinning directly follows the development of partial dislocation shearing that has various origins (perfect dislocation splitting, anchoring). It is shown that, although twinning is more frequently observed at liquid nitrogen temperature, its prevalence depends mainly on crystal orientation. As a result, twinning and perfect dislocation plasticity are likely to occur jointly in random oriented polycrystals, even at early stages of deformation.
Domaines
Mécanique des matériaux [physics.class-ph] Cristallographie Mécanique des solides [physics.class-ph] Matériaux Science des matériaux [cond-mat.mtrl-sci] Mécanique des matériaux [physics.class-ph] Matériaux et structures en mécanique [physics.class-ph] Mécanique des solides [physics.class-ph] Mécanique des structures [physics.class-ph] Matériaux Génie mécanique [physics.class-ph]| Origine | Fichiers produits par l'(les) auteur(s) |
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