Journal
SCRIPTA MATERIALIA
Volume 71, Issue -, Pages 33-36Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2013.09.028
Keywords
Nanocrystalline materials; Twins; Deformation; Grain boundaries; Dislocations
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Funding
- Russian Ministry of Education and Science [14.B25.31.0017, 8025]
- St Petersburg State University research Grant [6.37.671.2013]
- Russian Foundation of Basic Research [12-02-31642-mol-a]
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A special physical mechanism for the formation of nanoscale deformation twins in nanocrystalline and ultrafine-grained materials is suggested and theoretically described. The mechanism represents the cooperative emission of partial dislocations from grain boundaries (GBs) which is preceded and induced by both GB sliding and stress-driven climb of GB dislocations. The energy and stress characteristics of the nanotwin formation through cooperative emission of dislocations from GBs in nanocrystalline nickel and silicon carbide are calculated and discussed. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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