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Comparisons of self-annealing behaviour of HPT-processed high purity Cu and a Pb-Sn alloy

Comparisons of self-annealing behaviour of HPT-processed high purity Cu and a Pb-Sn alloy
Comparisons of self-annealing behaviour of HPT-processed high purity Cu and a Pb-Sn alloy
Early published results have demonstrated that high purity Cu and a Pb-62% Sn alloy exhibit very different behaviour during high-pressure torsion (HPT) processing at room temperature and subsequent room temperature storage. High purity Cu showed strain hardening behaviour with a refined grain structure during HPT processing whereas a Pb-62% Sn alloy displayed a strain weakening behaviour because the hardness values after HPT processing were significantly lower than in the initial as-cast condition even though the grain size was reduced. During room temperature storage after HPT processing, high purity Cu with lower numbers of rotations softened with the time of storage due to local recrystallization and abnormal grain growth whereas the Pb-62% Sn alloy hardened with the time of storage accompanied by grain growth. Through comparisons and analysis, it is shown that the low absolute melting point and the high homologous temperature at room temperature in the Pb-62% Sn alloy contribute to the increase in hardness with coarsening grain size during room temperature storage.
2238-7854
390-395
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.
32728ba0-8d0d-4268-b58d-4e97f3bc54aa
Zhang, Nian Xian
1f72e293-27fe-41d4-956c-7e8c8a40b3b0
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
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.
32728ba0-8d0d-4268-b58d-4e97f3bc54aa
Zhang, Nian Xian
1f72e293-27fe-41d4-956c-7e8c8a40b3b0
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Huang, Yi, Sabbaghianrad, Shima, Almazrouee, Abdulla I., Al-Fadhalah, Khaled J., Alhajeri, Saleh N., Zhang, Nian Xian and Langdon, Terence G. (2017) Comparisons of self-annealing behaviour of HPT-processed high purity Cu and a Pb-Sn alloy. Journal of Materials Research and Technology, 6 (4), 390-395. (doi:10.1016/j.jmrt.2017.07.002).

Record type: Article

Abstract

Early published results have demonstrated that high purity Cu and a Pb-62% Sn alloy exhibit very different behaviour during high-pressure torsion (HPT) processing at room temperature and subsequent room temperature storage. High purity Cu showed strain hardening behaviour with a refined grain structure during HPT processing whereas a Pb-62% Sn alloy displayed a strain weakening behaviour because the hardness values after HPT processing were significantly lower than in the initial as-cast condition even though the grain size was reduced. During room temperature storage after HPT processing, high purity Cu with lower numbers of rotations softened with the time of storage due to local recrystallization and abnormal grain growth whereas the Pb-62% Sn alloy hardened with the time of storage accompanied by grain growth. Through comparisons and analysis, it is shown that the low absolute melting point and the high homologous temperature at room temperature in the Pb-62% Sn alloy contribute to the increase in hardness with coarsening grain size during room temperature storage.

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YH_PAM2017_JMRT_accepted manuscript - Accepted Manuscript
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More information

Accepted/In Press date: 13 July 2017
e-pub ahead of print date: 10 August 2017
Published date: 30 November 2017

Identifiers

Local EPrints ID: 412866
URI: http://eprints.soton.ac.uk/id/eprint/412866
ISSN: 2238-7854
PURE UUID: 4d26d53a-19e3-4187-85f1-5671230f1fc2
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: 04 Aug 2017 16:30
Last modified: 07 Oct 2020 04:10

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