Evidence for a transition in deformation mechanism in nanocrystalline pure titanium processed by high-pressure torsion
Evidence for a transition in deformation mechanism in nanocrystalline pure titanium processed by high-pressure torsion
Nanocrystalline titanium with an average grain size of about 60–70 nm was prepared by high-pressure torsion. The results of hardness and structural evolutions indicate that a strain-induced hardening–softening–hardening–softening behaviour occurs. For coarse-grained titanium, ?a?-type dislocation multiplication, twinning and a high pressure-induced ?-to-? phase transformation play major roles to accommodate deformation, leading to a significant strain hardening. As deformation proceeds, dynamic recrystallisation leads to a decrease in dislocation density, especially for ?a?-type dislocations, leading to a slight strain softening. The ?c?-component dislocation multiplication dominates the deformation when the grain size decreases to 100 nm and ?c?-component dislocation multiplication, grain refinement and the ?-to-? phase transformation contribute to the second strain hardening. The following strain softening is attributed to dynamic recovery.
1632-1642
Yang, Chao
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Song, Min
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Liu, Yong
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Ni, Song
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Sabbaghianrad, Shima
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Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
May 2016
Yang, Chao
0a24b74d-70a8-4f0a-ad80-74f1992f46cf
Song, Min
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Liu, Yong
46055259-010f-4059-9f6a-916049ea7523
Ni, Song
84c6cbce-a7fa-4849-b3f8-c0ddf7b8cc93
Sabbaghianrad, Shima
2dbc35ee-f341-42fd-9081-94ef3e9b10b0
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Yang, Chao, Song, Min, Liu, Yong, Ni, Song, Sabbaghianrad, Shima and Langdon, Terence G.
(2016)
Evidence for a transition in deformation mechanism in nanocrystalline pure titanium processed by high-pressure torsion.
Philosophical Magazine, 96 (16), part Part A: Materials Science, .
(doi:10.1080/14786435.2016.1177230).
Abstract
Nanocrystalline titanium with an average grain size of about 60–70 nm was prepared by high-pressure torsion. The results of hardness and structural evolutions indicate that a strain-induced hardening–softening–hardening–softening behaviour occurs. For coarse-grained titanium, ?a?-type dislocation multiplication, twinning and a high pressure-induced ?-to-? phase transformation play major roles to accommodate deformation, leading to a significant strain hardening. As deformation proceeds, dynamic recrystallisation leads to a decrease in dislocation density, especially for ?a?-type dislocations, leading to a slight strain softening. The ?c?-component dislocation multiplication dominates the deformation when the grain size decreases to 100 nm and ?c?-component dislocation multiplication, grain refinement and the ?-to-? phase transformation contribute to the second strain hardening. The following strain softening is attributed to dynamic recovery.
Text
Song-Philosophical Magazine 2016.pdf
- Accepted Manuscript
More information
Accepted/In Press date: 25 March 2016
e-pub ahead of print date: 2 May 2016
Published date: May 2016
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 394177
URI: http://eprints.soton.ac.uk/id/eprint/394177
ISSN: 1478-6435
PURE UUID: 9d3aec2c-eb3b-4511-b8a9-41001a3bef8e
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Date deposited: 12 May 2016 11:20
Last modified: 15 Mar 2024 05:34
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Contributors
Author:
Chao Yang
Author:
Min Song
Author:
Yong Liu
Author:
Song Ni
Author:
Shima Sabbaghianrad
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