Effect of grain size and crystallographic structure on the corrosion and tribocorrosion behaviour of a CoCrMo biomedical grade alloy in simulated body fluid
Effect of grain size and crystallographic structure on the corrosion and tribocorrosion behaviour of a CoCrMo biomedical grade alloy in simulated body fluid
CoCrMo alloys are used in hip and knee replacements due to their excellent long-term survival rates. However, high failure rates have recently been observed associated with adverse tissue reactions. CoCrMo alloy surfaces undergo microstructural changes during wear, including the formation of ε-martensite and, occasionally, a nanocrystalline surface layer. It is not clear whether these changes are beneficial or detrimental to the performance of the component. Thus, high-pressure torsion (HPT) was employed to produce different grain sizes and crystallographic structures in a CoCrMo alloy and the corrosion and tribocorrosion behaviour were critically investigated as a function of grain size. The results reveal a degradation of the corrosion resistance for the HTP processed samples. The contributions of mechanical and corrosion material loss in tribocorrosion is also examined.
CoCrMo biomedical grade alloy, high-pressure torsion, nanocrystalline structures, tribocorrosion.
Namus, Righdan
080fd40e-b7c0-4624-99a7-22a0cca0c8ee
Rainforth, W. Mark
7226983c-4ca1-4f0a-8191-02e3424dc98f
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
15 August 2021
Namus, Righdan
080fd40e-b7c0-4624-99a7-22a0cca0c8ee
Rainforth, W. Mark
7226983c-4ca1-4f0a-8191-02e3424dc98f
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Namus, Righdan, Rainforth, W. Mark, Huang, Yi and Langdon, Terence G
(2021)
Effect of grain size and crystallographic structure on the corrosion and tribocorrosion behaviour of a CoCrMo biomedical grade alloy in simulated body fluid.
Wear, 478-479, [203884].
(doi:10.1016/j.wear.2021.203884).
Abstract
CoCrMo alloys are used in hip and knee replacements due to their excellent long-term survival rates. However, high failure rates have recently been observed associated with adverse tissue reactions. CoCrMo alloy surfaces undergo microstructural changes during wear, including the formation of ε-martensite and, occasionally, a nanocrystalline surface layer. It is not clear whether these changes are beneficial or detrimental to the performance of the component. Thus, high-pressure torsion (HPT) was employed to produce different grain sizes and crystallographic structures in a CoCrMo alloy and the corrosion and tribocorrosion behaviour were critically investigated as a function of grain size. The results reveal a degradation of the corrosion resistance for the HTP processed samples. The contributions of mechanical and corrosion material loss in tribocorrosion is also examined.
Text
Namus-Manuscript-WEA-D-20-00376R1-TGL
- Accepted Manuscript
More information
Accepted/In Press date: 24 March 2021
e-pub ahead of print date: 1 April 2021
Published date: 15 August 2021
Additional Information:
Funding Information:
We wish to acknowledge the Henry Royce Institute for Advanced Materials ( EPSRC Grant Number EP/R00661X/1) for the financial support and equipment access at Royce@Sheffield. Two of the authors were supported by the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS (YH and TGL).
Publisher Copyright:
© 2021
Keywords:
CoCrMo biomedical grade alloy, high-pressure torsion, nanocrystalline structures, tribocorrosion.
Identifiers
Local EPrints ID: 450141
URI: http://eprints.soton.ac.uk/id/eprint/450141
ISSN: 0043-1648
PURE UUID: 1627f740-e662-497c-9715-c005f826e625
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Date deposited: 13 Jul 2021 16:31
Last modified: 17 Mar 2024 06:40
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Author:
Righdan Namus
Author:
W. Mark Rainforth
Author:
Yi Huang
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