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Mechanical properties and microstructural stability of CuTa/Cu composite coatings

Mechanical properties and microstructural stability of CuTa/Cu composite coatings
Mechanical properties and microstructural stability of CuTa/Cu composite coatings

In this study, the structure and mechanical properties of as-deposited and 823.15 K annealed CuTa coatings were studied with the purpose to evaluate the microstructural and mechanical thermal stability as a function of the Ta content. CuTa coatings with a Ta content from 0 to 100% were prepared by magnetron co-sputtering. Their structure and mechanical properties were characterized by grazing angle X-ray diffraction (XRD), scanning and transmission electron microscopy (TEM), and nanoindentation. The XRD results show that a Ta-rich CuTa glass metal is formed in the coatings with 15–67 at.% Ta along with nanocrystalline Cu and such microstructure was retained after vacuum annealing at 823.15 K. TEM analyses of selected samples showed the formation of crystalline Cu islands in an amorphous CuTa matrix in both as-deposited and annealed coatings. The coatings presented a 3D distribution of Cu nanocrystals within an amorphous CuTa matrix which might reduce the brittleness of the glassy CuTa matrix. A significant increase in hardness values from 0.9 GPa for pure Cu to 11.9 GPa for the sample with 98 at.% Ta is observed. It has been shown that the composite coatings preserved the microstructure and were mechanically stable after vacuum annealing.

Cu-Ta coatings, Magnetron sputtering, Mechanical properties, Vacuum annealing
0257-8972
22-31
Bahrami, Amin
c82b75da-e66e-4020-a305-a21cb9f5fbcd
Onofre Carrasco, Cesar F.
04eb0f07-1f46-410c-aa43-1509dd3a241a
Cardona, Arturo Delgado
2419345d-1af7-4986-b6d7-2e55c8ca7a9f
Huminiuc, Teodor
b743b7ba-7541-4f2e-b4be-ea25b088e4c6
Polcar, Tomas
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Rodil, Sandra E.
13d8342c-6e07-4b00-ab67-a04b50752ed8
Bahrami, Amin
c82b75da-e66e-4020-a305-a21cb9f5fbcd
Onofre Carrasco, Cesar F.
04eb0f07-1f46-410c-aa43-1509dd3a241a
Cardona, Arturo Delgado
2419345d-1af7-4986-b6d7-2e55c8ca7a9f
Huminiuc, Teodor
b743b7ba-7541-4f2e-b4be-ea25b088e4c6
Polcar, Tomas
c669b663-3ba9-4e7b-9f97-8ef5655ac6d2
Rodil, Sandra E.
13d8342c-6e07-4b00-ab67-a04b50752ed8

Bahrami, Amin, Onofre Carrasco, Cesar F., Cardona, Arturo Delgado, Huminiuc, Teodor, Polcar, Tomas and Rodil, Sandra E. (2019) Mechanical properties and microstructural stability of CuTa/Cu composite coatings. Surface and Coatings Technology, 364, 22-31. (doi:10.1016/j.surfcoat.2019.02.072).

Record type: Article

Abstract

In this study, the structure and mechanical properties of as-deposited and 823.15 K annealed CuTa coatings were studied with the purpose to evaluate the microstructural and mechanical thermal stability as a function of the Ta content. CuTa coatings with a Ta content from 0 to 100% were prepared by magnetron co-sputtering. Their structure and mechanical properties were characterized by grazing angle X-ray diffraction (XRD), scanning and transmission electron microscopy (TEM), and nanoindentation. The XRD results show that a Ta-rich CuTa glass metal is formed in the coatings with 15–67 at.% Ta along with nanocrystalline Cu and such microstructure was retained after vacuum annealing at 823.15 K. TEM analyses of selected samples showed the formation of crystalline Cu islands in an amorphous CuTa matrix in both as-deposited and annealed coatings. The coatings presented a 3D distribution of Cu nanocrystals within an amorphous CuTa matrix which might reduce the brittleness of the glassy CuTa matrix. A significant increase in hardness values from 0.9 GPa for pure Cu to 11.9 GPa for the sample with 98 at.% Ta is observed. It has been shown that the composite coatings preserved the microstructure and were mechanically stable after vacuum annealing.

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More information

Accepted/In Press date: 21 February 2019
e-pub ahead of print date: 22 February 2019
Published date: 25 April 2019
Keywords: Cu-Ta coatings, Magnetron sputtering, Mechanical properties, Vacuum annealing

Identifiers

Local EPrints ID: 431204
URI: http://eprints.soton.ac.uk/id/eprint/431204
ISSN: 0257-8972
PURE UUID: c71e8759-f5fd-4b91-8748-b93d383a3c8f
ORCID for Tomas Polcar: ORCID iD orcid.org/0000-0002-0863-6287

Catalogue record

Date deposited: 24 May 2019 16:30
Last modified: 26 Nov 2021 02:57

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Contributors

Author: Amin Bahrami
Author: Cesar F. Onofre Carrasco
Author: Arturo Delgado Cardona
Author: Teodor Huminiuc
Author: Tomas Polcar ORCID iD
Author: Sandra E. Rodil

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