Abstract
Wear and tribocorrosion of CoCrMo alloys have been associated with adverse local tissue reactions. The tribological and electrochemical processes that arise during single asperity contact at the scale of passive oxide films are poorly understood. An AFM-based ‘image-wear-image’ tribology method was applied to study the sub-nanoscale wear and tribocorrosion of traditional and additively manufactured CoCrMo and CoCrMoW alloys. Atomic wear and elasto-plastic driven wear were observed at wear depths near the oxide thickness. Contact stress, alloy, and environment significantly affected average nanowear depth. Surface degradation varied from grain to grain within LC CoCrMo and by intragranular cellular structures within AM CoCrMoW.
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