On the origin of the Hall–Petch law: A 3D-dislocation dynamics simulation investigation - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Acta Materialia Année : 2021

On the origin of the Hall–Petch law: A 3D-dislocation dynamics simulation investigation

Résumé

3D-DD simulations are performed with cubic grains ranging from 1 to 10 µm to investigate the physical mechanisms at the origin of the Hall–Petch law. In particular, the long-range stress (back stress) induced by the density of polarized dislocations (GNDs) accumulated at GBs is quantified separately from the short-range stress associated with the forest dislocation (SSDs) density. We show that the back stress and the associated strain hardening is independent of grain size at low strain. Hence, the grain size effect reproduced by 3D-DD simulations is controlled by an increase of the CRSS when decreasing grain size. Such evolution of the CRSS amplitude is controlled by two competing strengthening mechanisms justifying the generic 1/sqrt(d) dependent form of the Hall–Petch law observed in simulations and experiments.
Fichier principal
Vignette du fichier
S1359645421001634.pdf (1.35 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03260921 , version 1 (24-04-2023)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Maoyuan Jiang, Ghiath Monnet, Benoit Devincre. On the origin of the Hall–Petch law: A 3D-dislocation dynamics simulation investigation. Acta Materialia, 2021, 209, pp.116783. ⟨10.1016/j.actamat.2021.116783⟩. ⟨hal-03260921⟩
35 Consultations
38 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More