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Fabrication and characterization of nanostructured immiscible Cu-Ta alloys processed by high-pressure torsion

Fabrication and characterization of nanostructured immiscible Cu-Ta alloys processed by high-pressure torsion
Fabrication and characterization of nanostructured immiscible Cu-Ta alloys processed by high-pressure torsion
Nanostructured Cu–Ta alloys show great potential as high strength nanocrystalline materials due to their excellent mechanical properties and limited grain growth at high temperatures. This report describes the fabrication of nanostructured immiscible Cu–Ta alloys in bulk by high-pressure torsion (HPT) using a stack of Cu/Ta/Cu discs at room temperature. A microstructural study after HPT processing showed that the internal Ta layer breaks into small individual flakes which distribute uniformly over the Cu matrix through increases in the numbers of HPT turns. There is solid-state diffusion between the Cu and Ta when the HPT processing increases to 100 turns due to microstructural refinement and increasing crystalline defects. After processing through 150 turns, a composite microstructure of two phases is formed including supersaturated Cu–Ta solid solutions (Cu81Ta19 and Ta78Cu22 alloys) with a crystallite size of ∼35–45 nm. This fine microstructure produces exceptional mechanical properties including a high hardness of over 350 Hv corresponding to ∼3.43 GPa, a tensile strength of ∼1300 MPa and a tensile elongation of about 40%.
Cu-Ta alloys, high-pressure torsion, nanostructures, severe plastic deformation
0925-8388
Mousavi, Tayebeh
d0cc107c-d48a-47c4-8b55-ee890856e54e
Dai, Jiaoyan
01c2e554-8d38-4062-80d2-4e9483747343
Bazarnik, Piotr
844b4a15-226a-4275-9cee-812669fa033c
Pereira, Pedro Henrique R.
f033a8a6-ddad-4f6a-91ec-521a3358e4c2
Huang, Yi
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Lewandowska, Malgorzata
c574d02d-d34d-4164-8ed1-90c3d77584d2
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Mousavi, Tayebeh
d0cc107c-d48a-47c4-8b55-ee890856e54e
Dai, Jiaoyan
01c2e554-8d38-4062-80d2-4e9483747343
Bazarnik, Piotr
844b4a15-226a-4275-9cee-812669fa033c
Pereira, Pedro Henrique R.
f033a8a6-ddad-4f6a-91ec-521a3358e4c2
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Lewandowska, Malgorzata
c574d02d-d34d-4164-8ed1-90c3d77584d2
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Mousavi, Tayebeh, Dai, Jiaoyan, Bazarnik, Piotr, Pereira, Pedro Henrique R., Huang, Yi, Lewandowska, Malgorzata and Langdon, Terence G (2020) Fabrication and characterization of nanostructured immiscible Cu-Ta alloys processed by high-pressure torsion. Journal of Alloys and Compounds, 832, [155007]. (doi:10.1016/j.jallcom.2020.155007).

Record type: Article

Abstract

Nanostructured Cu–Ta alloys show great potential as high strength nanocrystalline materials due to their excellent mechanical properties and limited grain growth at high temperatures. This report describes the fabrication of nanostructured immiscible Cu–Ta alloys in bulk by high-pressure torsion (HPT) using a stack of Cu/Ta/Cu discs at room temperature. A microstructural study after HPT processing showed that the internal Ta layer breaks into small individual flakes which distribute uniformly over the Cu matrix through increases in the numbers of HPT turns. There is solid-state diffusion between the Cu and Ta when the HPT processing increases to 100 turns due to microstructural refinement and increasing crystalline defects. After processing through 150 turns, a composite microstructure of two phases is formed including supersaturated Cu–Ta solid solutions (Cu81Ta19 and Ta78Cu22 alloys) with a crystallite size of ∼35–45 nm. This fine microstructure produces exceptional mechanical properties including a high hardness of over 350 Hv corresponding to ∼3.43 GPa, a tensile strength of ∼1300 MPa and a tensile elongation of about 40%.

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YH-JALCOM-accepted manuscript - Accepted Manuscript
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More information

Accepted/In Press date: 31 March 2020
e-pub ahead of print date: 4 April 2020
Keywords: Cu-Ta alloys, high-pressure torsion, nanostructures, severe plastic deformation

Identifiers

Local EPrints ID: 439453
URI: http://eprints.soton.ac.uk/id/eprint/439453
ISSN: 0925-8388
PURE UUID: 26170ce8-42d8-46b3-86f9-400a503b5758
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: 23 Apr 2020 16:33
Last modified: 26 Nov 2021 02:57

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Contributors

Author: Tayebeh Mousavi
Author: Jiaoyan Dai
Author: Piotr Bazarnik
Author: Pedro Henrique R. Pereira
Author: Yi Huang ORCID iD
Author: Malgorzata Lewandowska

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