Microstructural evolution and mechanical properties of Co-Cr-Mo alloys subjected to high pressure torsion and short-time solution treatment

摘要

Co-Cr-Mo (CCM) alloys are currently used for biomedical applications such as artificial hip and knee joints because of their excellent biocompability, strength and wear resistance. However, there is still occurrence of failure in the fabricated prosthesis using these alloys. Therefore, it is crucial to enhance their mechanical properties. High pressure torsion (HPT) has been recognized as an effective way to improve mechanical strength of CCM alloys by means of controlling phase transformation and grain refinement, which however decreases the elongation. Short-time solution treatment might recover the elongation with a little cost in strength of HPT processed CCM alloys. In this study, the microstructures and mechanical properties of CCM alloys subjected to HPT and subsequently short-time solution treatment were investigated.