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Effect of grain size and crystallographic structure on the corrosion and tribocorrosion behaviour of a CoCrMo biomedical grade alloy in simulated body fluid.

Namus, R., Rainforth, W.M., Huang, Y. and Langdon, T.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, 478-9 (August), -.

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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.

Item Type:Article
ISSN:0043-1648
Uncontrolled Keywords:CoCrMo biomedical Grade alloy; High-pressure torsion; Nanocrystalline structures; Tribocorrosion
Group:Faculty of Science & Technology
ID Code:35392
Deposited By: Unnamed user with email symplectic@symplectic
Deposited On:13 Apr 2021 13:44
Last Modified:27 May 2021 07:54

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