The significance of self-annealing at room temperature
in high purity copper processed by high-pressure torsion
The significance of self-annealing at room temperature
in high purity copper processed by high-pressure torsion
High purity copper was processed by high-pressure torsion (HPT) at room temperature and then stored at room temperature for periods of up to 6 weeks to investigate the effect of self-annealing. Hardness measurements were recorded both at 48 h after HPT processing and after various storage times. The results show the occurrence of recovery near the edges of the discs after processing through 1/2 and 1 turn and this leads to a significant drop in the measured hardness values which is accompanied by microstructural evidence for abnormal grain growth. Conversely, there was no recovery, and therefore no hardness drops, after processing through 5 and 10 turns. X-ray line profile analysis was used to determine the crystallite sizes and dislocation densities at 1 h after HPT and after storage for different times. The results show a good thermal stability in high purity Cu after processing through more than 1 turn of HPT but care must be exercised in recording hardness measurements when processing through only fractional or very small numbers of turns.
copper, grain growth, hardness, high-pressure torsion, self-annealing
55-66
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Sabbaghianrad, Shima
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Almazrouee, Abdulla I.
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Al-Fadhalah, Khaled J.
364d5aed-c107-4104-9be0-6bf0ae28d20b
Alhajeri, Saleh N.
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Langdon, Terence G.
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22 February 2016
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Sabbaghianrad, Shima
2dbc35ee-f341-42fd-9081-94ef3e9b10b0
Almazrouee, Abdulla I.
6aaff277-2dcc-4dbd-afd0-75620aa6b6a9
Al-Fadhalah, Khaled J.
364d5aed-c107-4104-9be0-6bf0ae28d20b
Alhajeri, Saleh N.
4d3f50b6-87ab-4690-87dd-bea08fb1c77f
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Huang, Yi, Sabbaghianrad, Shima, Almazrouee, Abdulla I., Al-Fadhalah, Khaled J., Alhajeri, Saleh N. and Langdon, Terence G.
(2016)
The significance of self-annealing at room temperature
in high purity copper processed by high-pressure torsion.
Materials Science and Engineering: A, 656, .
(doi:10.1016/j.msea.2016.01.027).
Abstract
High purity copper was processed by high-pressure torsion (HPT) at room temperature and then stored at room temperature for periods of up to 6 weeks to investigate the effect of self-annealing. Hardness measurements were recorded both at 48 h after HPT processing and after various storage times. The results show the occurrence of recovery near the edges of the discs after processing through 1/2 and 1 turn and this leads to a significant drop in the measured hardness values which is accompanied by microstructural evidence for abnormal grain growth. Conversely, there was no recovery, and therefore no hardness drops, after processing through 5 and 10 turns. X-ray line profile analysis was used to determine the crystallite sizes and dislocation densities at 1 h after HPT and after storage for different times. The results show a good thermal stability in high purity Cu after processing through more than 1 turn of HPT but care must be exercised in recording hardness measurements when processing through only fractional or very small numbers of turns.
Text
YH-High purity Cu_MSE accepted manuscript.pdf
- Accepted Manuscript
More information
Accepted/In Press date: 8 January 2016
e-pub ahead of print date: 11 January 2016
Published date: 22 February 2016
Keywords:
copper, grain growth, hardness, high-pressure torsion, self-annealing
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 385686
URI: http://eprints.soton.ac.uk/id/eprint/385686
ISSN: 0921-5093
PURE UUID: a4a3d274-c721-4886-b0ff-12b2f77f78d6
Catalogue record
Date deposited: 21 Jan 2016 10:59
Last modified: 15 Mar 2024 03:39
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Contributors
Author:
Yi Huang
Author:
Shima Sabbaghianrad
Author:
Abdulla I. Almazrouee
Author:
Khaled J. Al-Fadhalah
Author:
Saleh N. Alhajeri
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