Orientation influence on grain size-effects in ultrafine-grained magnesium

Fan, Haidong; Aubry, Sylvie; Arsenlis, A.; El-Awady, Jaafar

doi:10.1016/j.scriptamat.2014.10.031

Title: Orientation influence on grain size-effects in ultrafine-grained magnesium

Journal Article · Sat Nov 08 00:00:00 EST 2014 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2014.10.031· OSTI ID:1257300

Fan, Haidong ^[1]; Aubry, Sylvie ^[2]; Arsenlis, A. ^[2]; El-Awady, Jaafar ^[3]

Sichuan Univ., Chengdu (China); Johns Hopkins Univ., Baltimore, MD (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Johns Hopkins Univ., Baltimore, MD (United States)

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 is observed. These results reveal that the grain size effect depends on 3 factors: Peierls stress, dislocation source strength and grain boundary strength.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1257300

Report Number(s):: LLNL-JRNL-694164

Journal Information:: Scripta Materialia, Vol. 97; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 40 works

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