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. alloy surfaces undergo microstructural changes during wear, including the formation of ?-martensite and, occasionally, a nanocrystalline surface layer. It is not clear whether these beneficial or detrimental performance component. Thus, high-pressure torsion (HPT) was employed produce different grain sizes crystallographic structures corrosion tribocorrosion behaviour were critically investigated as function size. The results reveal degradation resistance for HTP processed samples. contributions mechanical material loss also examined. • HPT biomedical grade alloy. Corrosion various degraded wear accelerated increased enhanced microstructure