Orientation influence on grain size effects in ultrafine-grained magnesium. (1st March 2015)

• Record Type: Journal Article
• Authors: Fan, Haidong; Aubry, Sylvie; Arsenlis, A.; El-Awady, Jaafar A.
• Is Part Of: Scripta materialia. Volume 97(2015)
• Page Start: 25
• Page End: 28
• Publication Date: 2015-03-01
• Subjects: Discrete dislocation dynamics -- Grain size effects -- Ultrafine-grained magnesium -- Orientation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2014.10.031
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : The mechanical behavior of ultrafine-grained magnesium was studied by discrete dislocation dynamics (DDD) simulations. Our results show basal slip yields a strong size effect, while prismatic and pyramidal slips produce a weak one. We developed a new size–strength model that considers dislocation transmission across grain boundaries. Good agreement between this model, current DDD simulations and previous experiments was observed. These results reveal that the grain size effect depends on three factors: Peierls stress, dislocation source strength and grain boundary strength.