Grain boundary formation by remnant dislocations from the de-twinning of thin nano-twins

Title
Grain boundary formation by remnant dislocations from the de-twinning of thin nano-twins
Authors
Kawasaki, Megumi
Keywords
Grain boundary; Twinning; De-twinning; Grain refinement; Steel
Issue Date
2015-04
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
SCRIPTA MATERIALIA, v. 100, Page. 98-101
Abstract
We report a grain boundary formation mechanism in face-centred cubic metals with low stacking fault energies. Severe plastic deformation produces primary nano-twins with a twin boundary spacing of several nanometres, followed by secondary twinning through the activation of Shockley partial dislocations. The partial dislocations interact with primary twin boundaries, resulting in de-twinning of the primary twins and producing very high densities of sessile dislocations. The accumulation of these dislocations produces new grain boundaries with neighbouring grains having similar orientations. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S135964621500007Xhttp://hdl.handle.net/20.500.11754/23876
ISSN
1359-6462
DOI
http://dx.doi.org/10.1016/j.scriptamat.2015.01.001
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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