The University of Southampton
University of Southampton Institutional Repository

Evaluating the paradox of strength and ductility in ultrafine-grained oxygen-free copper processed by ECAP at room temperature

Evaluating the paradox of strength and ductility in ultrafine-grained oxygen-free copper processed by ECAP at room temperature
Evaluating the paradox of strength and ductility in ultrafine-grained oxygen-free copper processed by ECAP at room temperature
Oxygen-free copper of >99.95% purity was processed by equal-channel angular pressing at room temperature (RT) for up to 24 passes and then pulled to failure at RT using strain rates from 10-4 to 10-2 s -1. The results show that the microstrain increases with strain at the lower numbers of passes but decreases between 16 and 24 passes. Similar trends were found also for the dislocation density, the Vickers microhardness and the values of the measured yield stresses in tensile testing. X-ray diffraction measurements showed a minor increase in the crystallite size at the high strain imposed by processing through 24 passes. These results demonstrate the occurrence of dynamic recovery at the highest strain. In tensile testing at a strain rate of 10-3s-1 the results gave a yield stress of ~391 MPa and an elongation to failure of 52% which is consistent with an earlier report using Cu of much higher purity but not consistent with an earlier report using Cu of the same purity.
Copper, Ductility, Equal-channel angular pressing, Strength, Ultrafine grains
Alawadhi, Meshal Y.
98c0239a-e3ce-4cfd-b3db-c98aa3c2afbd
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Sabbaghianrad, S.
a061a940-ba10-4c18-945c-142464addb36
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Alawadhi, Meshal Y.
98c0239a-e3ce-4cfd-b3db-c98aa3c2afbd
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Sabbaghianrad, S.
a061a940-ba10-4c18-945c-142464addb36
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Alawadhi, Meshal Y., Huang, Yi, Sabbaghianrad, S. and Langdon, Terence G (2021) Evaluating the paradox of strength and ductility in ultrafine-grained oxygen-free copper processed by ECAP at room temperature. Materials Science & Engineering: A, 802, [140546]. (doi:10.1016/j.msea.2020.140546).

Record type: Article

Abstract

Oxygen-free copper of >99.95% purity was processed by equal-channel angular pressing at room temperature (RT) for up to 24 passes and then pulled to failure at RT using strain rates from 10-4 to 10-2 s -1. The results show that the microstrain increases with strain at the lower numbers of passes but decreases between 16 and 24 passes. Similar trends were found also for the dislocation density, the Vickers microhardness and the values of the measured yield stresses in tensile testing. X-ray diffraction measurements showed a minor increase in the crystallite size at the high strain imposed by processing through 24 passes. These results demonstrate the occurrence of dynamic recovery at the highest strain. In tensile testing at a strain rate of 10-3s-1 the results gave a yield stress of ~391 MPa and an elongation to failure of 52% which is consistent with an earlier report using Cu of much higher purity but not consistent with an earlier report using Cu of the same purity.

Text
Meshal-MSE accepted manuscript - Accepted Manuscript
Download (1MB)

More information

Accepted/In Press date: 12 November 2020
e-pub ahead of print date: 17 November 2020
Published date: 20 January 2021
Keywords: Copper, Ductility, Equal-channel angular pressing, Strength, Ultrafine grains

Identifiers

Local EPrints ID: 445997
URI: http://eprints.soton.ac.uk/id/eprint/445997
PURE UUID: c264e025-6342-424f-b9ae-6bf5104e7b25
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 18 Jan 2021 17:33
Last modified: 06 Jun 2024 04:10

Export record

Altmetrics

Contributors

Author: Meshal Y. Alawadhi
Author: Yi Huang ORCID iD
Author: S. Sabbaghianrad

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×