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On the deformation twinning mechanisms in twinning-induced plasticity steel

Title
On the deformation twinning mechanisms in twinning-induced plasticity steel
Author
김진경
Keywords
In-situ transmission electron microscopy; Deformation twinning; TWIP steel; Shockley partial dislocation; Frank partial dislocation
Issue Date
2017-12
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ACTA MATERIALIA, v. 141, Page. 444-455
Abstract
Deformation twinning in coarse-grained fcc metals results from the highly coordinated glide of Shockley partial dislocations with the same Burgers vector on successive {111}-type twinning planes. The main issue of the formation mechanism of deformation twinning is how the arrangement of Shockley partials required for twinning evolves. Here, we present the deformation twinning mechanism that operates in Fe-17Mn-0.45C-1.5Al-1Si TWIP steel by means of in-situ TEM deformation tests and post-mortem TEM characterization. The in-situ TEM observation shows the formation of a thin twin by Shockley partial dislocations generated in a grain boundary, which indicates the nucleation of deformation twins at grain boundary defect sites. The observed twinning process is similar to deformation twinning in nano crystalline materials through successive emission of partial dislocations from grain boundaries. In addition, a high density of Frank partial dislocations is observed inside deformations twins. These defects affect the growth of deformation twins and could contribute to the high work hardening of TWIP steel. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S1359645417308091https://repository.hanyang.ac.kr/handle/20.500.11754/99222
ISSN
1359-6454; 1873-2453
DOI
10.1016/j.actamat.2017.09.043
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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