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Microstructural evolution in a Cu-Zr alloy processed by a combination of ECAP and HPT

Microstructural evolution in a Cu-Zr alloy processed by a combination of ECAP and HPT
Microstructural evolution in a Cu-Zr alloy processed by a combination of ECAP and HPT
A Cu–0.1% Zr alloy was processed by equal-channel angular pressing (ECAP) for up to 8 passes and the samples processed through 4 and 8 passes were then sectioned into disks and further processed by high-pressure torsion (HPT) for 5 turns. Measurements were taken for the microhardness distributions on cross-sectional planes of the ECAP billets and on the HPT disks and the microstructures were examined using transmission electron microscopy and electron back-scatter diffraction. The results demonstrate that a combination of ECAP and HPT leads to additional grain refinement, higher hardness values and a larger fraction of boundaries having high angles of misorientation. The minimum average grain sizes recorded in these experiments were ?280 and ?260 nm at the center and edge of a disk, respectively, after processing through 8 passes of ECAP and 5 turns of HPT. The results contrast with an earlier report using high-purity Cu where a combination of ECAP and HPT gave a mixture of ultrafine and coarse grains due to the occurrence of dynamic recrystallization during the torsional straining
copper alloy, equal-channel angular pressing, hardness, high-pressure torsion, ultrafine grains
0921-5093
126-135
Wongsa-Ngam, Jittraporn
3a196159-d8e5-4658-a47b-a6f6c5a7dcc7
Wen, Haiming
e3153ed1-19df-4ad1-9ff1-f01afd1472ab
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Wongsa-Ngam, Jittraporn
3a196159-d8e5-4658-a47b-a6f6c5a7dcc7
Wen, Haiming
e3153ed1-19df-4ad1-9ff1-f01afd1472ab
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Wongsa-Ngam, Jittraporn, Wen, Haiming and Langdon, Terence G. (2013) Microstructural evolution in a Cu-Zr alloy processed by a combination of ECAP and HPT. Materials Science and Engineering: A, 579, 126-135. (doi:10.1016/j.msea.2013.05.010).

Record type: Article

Abstract

A Cu–0.1% Zr alloy was processed by equal-channel angular pressing (ECAP) for up to 8 passes and the samples processed through 4 and 8 passes were then sectioned into disks and further processed by high-pressure torsion (HPT) for 5 turns. Measurements were taken for the microhardness distributions on cross-sectional planes of the ECAP billets and on the HPT disks and the microstructures were examined using transmission electron microscopy and electron back-scatter diffraction. The results demonstrate that a combination of ECAP and HPT leads to additional grain refinement, higher hardness values and a larger fraction of boundaries having high angles of misorientation. The minimum average grain sizes recorded in these experiments were ?280 and ?260 nm at the center and edge of a disk, respectively, after processing through 8 passes of ECAP and 5 turns of HPT. The results contrast with an earlier report using high-purity Cu where a combination of ECAP and HPT gave a mixture of ultrafine and coarse grains due to the occurrence of dynamic recrystallization during the torsional straining

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More information

Published date: September 2013
Keywords: copper alloy, equal-channel angular pressing, hardness, high-pressure torsion, ultrafine grains
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 359474
URI: http://eprints.soton.ac.uk/id/eprint/359474
ISSN: 0921-5093
PURE UUID: 95a597b4-c5d0-4320-8a4a-64584a40a1e9
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 04 Nov 2013 14:27
Last modified: 15 Mar 2024 03:13

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Contributors

Author: Jittraporn Wongsa-Ngam
Author: Haiming Wen

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