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Grain size effect on deformation twinning and de-twinning in a nanocrystalline Ni-Fe alloy

Ni, S., Wang, Y.B., Liao, X. Z., Alhajeri, S.N., Li, Hh. Q., Ringer, S. P., Langdon, T.G. and Zhu, Y.T. (2011) Grain size effect on deformation twinning and de-twinning in a nanocrystalline Ni-Fe alloy Materials Science Forum, (667-669), pp. 181-186. (doi:10.4028/

Record type: Article


The effect of grain size on the deformation twinning and de-twinning in a nanocrystalline Ni-Fe alloy was investigated using transmission electron microscopy. Specimens with different grain sizes were obtained by severely deforming an electrochemically deposited nanocrystalline Ni-20wt.% Fe alloy using high-pressure torsion, which resulted in continuous grain growth from an average grain size of ~ 21 nm in the as-deposited material to ~ 72 nm for the highest strain applied in this study. Results show that deformation de-twinning occurs at very small grain sizes while deformation twinning takes place when the grain size is larger than ~ 45 nm. The mechanism of the observed grain size effect on twinning and de-twinning is briefly discussed.

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Published date: 2011
Organisations: Engineering Mats & Surface Engineerg Gp


Local EPrints ID: 187529
ISSN: 1662-9752
PURE UUID: e0dae333-052b-4401-b908-396b15c02f05
ORCID for T.G. Langdon: ORCID iD

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Date deposited: 17 May 2011 09:58
Last modified: 18 Jul 2017 11:45

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Author: S. Ni
Author: Y.B. Wang
Author: X. Z. Liao
Author: S.N. Alhajeri
Author: Hh. Q. Li
Author: S. P. Ringer
Author: T.G. Langdon ORCID iD
Author: Y.T. Zhu

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