Microstructure and mechanical properties of a nanostructured Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr supersaturated solid solution prepared by high pressure torsion
Microstructure and mechanical properties of a nanostructured Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr supersaturated solid solution prepared by high pressure torsion
In this study, a solution-treated Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy was processed by high pressure torsion (HPT) at room temperature, with the aim of producing a material with exceptional mechanical properties. Transmission electron microscopy and X-ray diffraction line broadening analysis reveal that a nanostructured supersaturated solid solution with a mean grain size of ~48 nm and high dislocation density of ~4.7×1014 m-2 is achieved by HPT deformation. After HPT processing, the present solution-treated samples show finer grains and higher dislocation densities as compared to as-cast samples of this alloy, other solution-treated Mg-RE alloys and conventional Mg alloys deformed using similar HPT processing conditions. This could be attributed to retardation of the dislocation annihilation through enhanced solute-dislocation and / or dislocation-dislocation interactions. The higher dislocation density and nanosized grains within supersaturated solid solution cause the microhardness to increase to ~126 HV, which is higher than that of the as-cast Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy processed by HPT, and is also higher than that of any conventional Mg-rich alloy deformed using HPT.
HPT, high pressure torsion, high pressure torsion (HPT), Mg-RE alloy, microstructure refinement, supersaturated solid siolution, hardening mechanism
366-376
Sun, W.T.
ad118a36-3179-4b8d-a93f-d30b312954ec
Qiao, X.G.
98a947bc-f5af-4841-9c53-c59a2d3fb9f8
Zheng, M.Y.
dd9a887e-b609-4e63-8ab1-982d5270a252
Xu,, C.
142dd97e-cc92-4d6b-9cf0-3e6ec235a1f6
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
5 December 2017
Sun, W.T.
ad118a36-3179-4b8d-a93f-d30b312954ec
Qiao, X.G.
98a947bc-f5af-4841-9c53-c59a2d3fb9f8
Zheng, M.Y.
dd9a887e-b609-4e63-8ab1-982d5270a252
Xu,, C.
142dd97e-cc92-4d6b-9cf0-3e6ec235a1f6
Gao, N.
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Sun, W.T., Qiao, X.G., Zheng, M.Y., Xu,, C., Gao, N. and Starink, M.J.
(2017)
Microstructure and mechanical properties of a nanostructured Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr supersaturated solid solution prepared by high pressure torsion.
Materials & Design, 135, .
(doi:10.1016/j.matdes.2017.09.048).
Abstract
In this study, a solution-treated Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy was processed by high pressure torsion (HPT) at room temperature, with the aim of producing a material with exceptional mechanical properties. Transmission electron microscopy and X-ray diffraction line broadening analysis reveal that a nanostructured supersaturated solid solution with a mean grain size of ~48 nm and high dislocation density of ~4.7×1014 m-2 is achieved by HPT deformation. After HPT processing, the present solution-treated samples show finer grains and higher dislocation densities as compared to as-cast samples of this alloy, other solution-treated Mg-RE alloys and conventional Mg alloys deformed using similar HPT processing conditions. This could be attributed to retardation of the dislocation annihilation through enhanced solute-dislocation and / or dislocation-dislocation interactions. The higher dislocation density and nanosized grains within supersaturated solid solution cause the microhardness to increase to ~126 HV, which is higher than that of the as-cast Mg-8.2Gd-3.8Y-1.0Zn-0.4Zr (wt.%) alloy processed by HPT, and is also higher than that of any conventional Mg-rich alloy deformed using HPT.
Text
Sun et al Mater Des 2017
- Accepted Manuscript
More information
Accepted/In Press date: 20 September 2017
e-pub ahead of print date: 21 September 2017
Published date: 5 December 2017
Keywords:
HPT, high pressure torsion, high pressure torsion (HPT), Mg-RE alloy, microstructure refinement, supersaturated solid siolution, hardening mechanism
Identifiers
Local EPrints ID: 414725
URI: http://eprints.soton.ac.uk/id/eprint/414725
ISSN: 0261-3069
PURE UUID: b97551b3-3cb8-48f1-bf54-13bd68ff3623
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Date deposited: 09 Oct 2017 16:30
Last modified: 16 Mar 2024 05:47
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Contributors
Author:
W.T. Sun
Author:
X.G. Qiao
Author:
M.Y. Zheng
Author:
C. Xu,
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