The significance of self-annealing in two-phase alloys processed by high-pressure torsion
The significance of self-annealing in two-phase alloys processed by high-pressure torsion
The Zn-22% Al eutectoid alloy and the Pb-62% Sn eutectic alloy were processed by high-pressure torsion (HPT) over a range of experimental conditions. Both alloys exhibit similar characteristics with significant grain refinement after processing by HPT but with a reduction in the hardness values by comparison with the initial unprocessed conditions. After storage at room temperature for a period of time, it is shown that the microhardness of both alloys gradually recovers to close to the initial unprocessed values. Electron backscatter diffraction (EBSD) measurements on the Pb-Sn alloy suggest that the self-recovery behaviour is correlated with the fraction of high-angle grain boundaries (HAGBs) after HPT processing. Thus, high fractions of HAGBs occur immediately after processing and this favours grain boundary migration and sliding which is important in the self-annealing and recovery process. Conversely, the relatively lower fractions of HAGBs occurring after annealing at room temperature are not so conducive to easy migration and sliding
12126
Zhang, Nian Xian
1f72e293-27fe-41d4-956c-7e8c8a40b3b0
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
August 2014
Zhang, Nian Xian
1f72e293-27fe-41d4-956c-7e8c8a40b3b0
Kawasaki, Megumi
944ba471-eb78-46db-bfb7-3f0296d9ef6d
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Zhang, Nian Xian, Kawasaki, Megumi, Huang, Yi and Langdon, Terence G.
(2014)
The significance of self-annealing in two-phase alloys processed by high-pressure torsion.
IOP Conference Series: Materials Science and Engineering, 63, .
(doi:10.1088/1757-899X/63/1/012126).
Abstract
The Zn-22% Al eutectoid alloy and the Pb-62% Sn eutectic alloy were processed by high-pressure torsion (HPT) over a range of experimental conditions. Both alloys exhibit similar characteristics with significant grain refinement after processing by HPT but with a reduction in the hardness values by comparison with the initial unprocessed conditions. After storage at room temperature for a period of time, it is shown that the microhardness of both alloys gradually recovers to close to the initial unprocessed values. Electron backscatter diffraction (EBSD) measurements on the Pb-Sn alloy suggest that the self-recovery behaviour is correlated with the fraction of high-angle grain boundaries (HAGBs) after HPT processing. Thus, high fractions of HAGBs occur immediately after processing and this favours grain boundary migration and sliding which is important in the self-annealing and recovery process. Conversely, the relatively lower fractions of HAGBs occurring after annealing at room temperature are not so conducive to easy migration and sliding
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Published date: August 2014
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 366772
URI: http://eprints.soton.ac.uk/id/eprint/366772
ISSN: 1757-899X
PURE UUID: f4ed1820-ac13-4a15-8847-76812d429f78
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Date deposited: 04 Sep 2014 12:52
Last modified: 15 Mar 2024 03:39
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Author:
Nian Xian Zhang
Author:
Megumi Kawasaki
Author:
Yi Huang
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