Strain hardening and softening in a nanocrystalline Ni–Fe alloy induced by severe plastic deformation
Strain hardening and softening in a nanocrystalline Ni–Fe alloy induced by severe plastic deformation
The strain response of an electrochemically deposited nanocrystalline Ni–20 wt.% Fe alloy processed by high-pressure torsion (HPT) was investigated by monitoring changes in hardness. Strain hardening was observed in the very early stage of HPT, followed by strain softening before the onset of a second strain hardening stage. Structural investigations revealed that the two hardening stages were associated with an increase in dislocation density, whereas the strain softening stage was accompanied by a reduction in the dislocation and twin densities, thereby demonstrating the main dependence of hardness on the dislocation density in this material. Grain growth occurred during HPT and its role in the hardness evolution is also discussed
severe plastic deformation, nanocrystalline materials, strain softening, strain hardening, dislocation density
3398-3403
Ni, S.
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Wang, Y.B.
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Liao, X.Z.
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Alhajeri, S.N.
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Li, H.Q.
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Zhao, Y.H.
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Lavernia, E.J.
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Langdon, T.G.
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Zhu, Y.T.
ddbd5b30-13ca-45a6-9296-ed5b60811efb
Ringer, S.P.
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April 2011
Ni, S.
c17ef5a0-a786-46ea-8c68-2cddc3c6a9fc
Wang, Y.B.
30d7b540-dc88-4382-867a-28d0354a8495
Liao, X.Z.
f0645a6d-aee1-4d28-aa13-f1b00fdedc41
Alhajeri, S.N.
4d3f50b6-87ab-4690-87dd-bea08fb1c77f
Li, H.Q.
f75bd557-296e-47bb-98de-f302465c59f5
Zhao, Y.H.
4fea315b-8c7d-4bb1-badc-236b309ef228
Lavernia, E.J.
6a721d94-e1ad-4921-a656-ac0e7c625bd1
Ringer, S.P.
2b986d4b-e93c-4801-9a1b-b16b39c30242
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Zhu, Y.T.
ddbd5b30-13ca-45a6-9296-ed5b60811efb
Ni, S., Wang, Y.B., Liao, X.Z., Alhajeri, S.N., Li, H.Q., Zhao, Y.H., Lavernia, E.J., Langdon, T.G. and Zhu, Y.T.
,
Ringer, S.P.
(ed.)
(2011)
Strain hardening and softening in a nanocrystalline Ni–Fe alloy induced by severe plastic deformation.
Materials Science and Engineering: A, 528 (9), .
(doi:10.1016/j.msea.2011.01.017).
Abstract
The strain response of an electrochemically deposited nanocrystalline Ni–20 wt.% Fe alloy processed by high-pressure torsion (HPT) was investigated by monitoring changes in hardness. Strain hardening was observed in the very early stage of HPT, followed by strain softening before the onset of a second strain hardening stage. Structural investigations revealed that the two hardening stages were associated with an increase in dislocation density, whereas the strain softening stage was accompanied by a reduction in the dislocation and twin densities, thereby demonstrating the main dependence of hardness on the dislocation density in this material. Grain growth occurred during HPT and its role in the hardness evolution is also discussed
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Published date: April 2011
Keywords:
severe plastic deformation, nanocrystalline materials, strain softening, strain hardening, dislocation density
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 190955
URI: http://eprints.soton.ac.uk/id/eprint/190955
ISSN: 0921-5093
PURE UUID: 6fe8a4e7-8b91-424f-a255-24dd21254a4a
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Date deposited: 16 Jun 2011 12:57
Last modified: 15 Mar 2024 03:13
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Contributors
Author:
S. Ni
Author:
Y.B. Wang
Author:
X.Z. Liao
Author:
S.N. Alhajeri
Author:
H.Q. Li
Author:
Y.H. Zhao
Author:
E.J. Lavernia
Editor:
S.P. Ringer
Author:
Y.T. Zhu
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