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Title: Grain size effects on dislocation and twinning mediated plasticity in magnesium

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.
Authors:
 [1] ;  [2] ;  [2] ; ORCiD logo [3]
  1. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Mechanical Engineering; Sichuan Univ., Sichuan (China)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Mechanical Engineering
Publication Date:
Report Number(s):
LLNL-JRNL-702743
Journal ID: ISSN 1359-6462
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 112; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Discrete dislocation dynamics; Size effects; Dislocation–twin boundary interactions; Magnesium; Twinning plasticity
OSTI Identifier:
1367992