Grain size effects on dislocation and twinning mediated plasticity in magnesium

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

doi:10.1016/j.scriptamat.2015.09.008

Grain size effects on dislocation and twinning mediated plasticity in magnesium

Journal Article · Sun Sep 20 00:00:00 EDT 2015 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2015.09.008· OSTI ID:1367992

Fan, Haidong ^[1]; Aubry, Sylvie ^[2]; Arsenlis, Athanasios ^[2]; ^[3]

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

Grain size effects on the competition between dislocation slip and {101¯2} -twinning in magnesium are investigated using discrete dislocation dynamics simulations. These simulations account for dislocation–twin boundary interactions and twin boundary migration through the glide of twinning dislocations. It is shown that twinning deformation exhibits a strong grain size effect; while dislocation mediated slip in untwinned polycrystals displays a weak one. In conclusion, this leads to a critical grain size at 2.7 μm, above which twinning dominates, and below which dislocation slip dominates.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1367992

Report Number(s):: LLNL-JRNL--702743

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: C Vol. 112; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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