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

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.
Authors:
 [1] ;  [2] ;  [2] ;  [3]
  1. Sichuan Univ., Chengdu (China); Johns Hopkins Univ., Baltimore, MD (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
OSTI Identifier:
1257300
Report Number(s):
LLNL-JRNL-694164
Journal ID: ISSN 1359-6462
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 97; 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-effect; Ultrafine-grained magnesium