Achieving ultra-high hardness of nanostructured Mg-8.2Gd-3.2Y-1.0Zn-0.4Zr alloy produced by a combination of high pressure torsion and ageing treatment
Achieving ultra-high hardness of nanostructured Mg-8.2Gd-3.2Y-1.0Zn-0.4Zr alloy produced by a combination of high pressure torsion and ageing treatment
Abstract A Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt%) alloy is subjected to a series of thermal and mechanical treatments involving solution treatment, artificial ageing to peak hardness, high pressure torsion (HPT) and a second artificial ageing. During HPT precipitates dissolve and during the final post-HPT ageing, the supersaturated solid solution decomposes and solutes segregate at grain boundaries. By employing this T6 + HPT + T5 treatment, the hardness increases to 156 ± 1 HV, which is much higher than that achieved by any other reported combination of thermal and thermo-mechanical processing of Mg alloys. The ultra-high hardness is due to the combined effects of solute segregation, grain refinement and high dislocation density.
Magnesium-rare earth alloy, High pressure torsion, Microstructure refinement, Ageing response, Solute segregation
21-25
Sun, W.T.
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Qiao, X.G.
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Zheng, M.Y.
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Zhao, X.J.
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Chen, H.W.
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Gao, N.
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Starink, M.J.
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2018
Sun, W.T.
4c1642d3-3add-4261-9e5b-cdff12a3ece2
Qiao, X.G.
868f643b-2a32-4469-977b-c08a8460a909
Zheng, M.Y.
dd9a887e-b609-4e63-8ab1-982d5270a252
Zhao, X.J.
4f2e2f9c-8125-480b-bf0b-1efaf9b6c13b
Chen, H.W.
3d494e0a-4595-42bf-901b-a13f38a2d86f
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Sun, W.T., Qiao, X.G., Zheng, M.Y., Zhao, X.J., Chen, H.W., Gao, N. and Starink, M.J.
(2018)
Achieving ultra-high hardness of nanostructured Mg-8.2Gd-3.2Y-1.0Zn-0.4Zr alloy produced by a combination of high pressure torsion and ageing treatment.
Scripta Materialia, 155, .
(doi:10.1016/j.scriptamat.2018.06.009).
Abstract
Abstract A Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt%) alloy is subjected to a series of thermal and mechanical treatments involving solution treatment, artificial ageing to peak hardness, high pressure torsion (HPT) and a second artificial ageing. During HPT precipitates dissolve and during the final post-HPT ageing, the supersaturated solid solution decomposes and solutes segregate at grain boundaries. By employing this T6 + HPT + T5 treatment, the hardness increases to 156 ± 1 HV, which is much higher than that achieved by any other reported combination of thermal and thermo-mechanical processing of Mg alloys. The ultra-high hardness is due to the combined effects of solute segregation, grain refinement and high dislocation density.
Text
Sun_et_al_Scr_Mater_2018
- Accepted Manuscript
More information
Accepted/In Press date: 14 June 2018
e-pub ahead of print date: 14 June 2018
Published date: 2018
Keywords:
Magnesium-rare earth alloy, High pressure torsion, Microstructure refinement, Ageing response, Solute segregation
Identifiers
Local EPrints ID: 421809
URI: http://eprints.soton.ac.uk/id/eprint/421809
ISSN: 1359-6462
PURE UUID: 25769735-5f5d-491e-be41-e3521df5342f
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Date deposited: 28 Jun 2018 16:30
Last modified: 16 Mar 2024 06:45
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Contributors
Author:
W.T. Sun
Author:
X.G. Qiao
Author:
M.Y. Zheng
Author:
X.J. Zhao
Author:
H.W. Chen
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