( KJS-13-7006) Mechanical properties of the Co-Cr-Mo alloy single crystal for the biomedical application

摘要

Co-Cr-Mo alloys have been widely applied as heat-resistant structural material, and inaddition its Ni-free alloys are particularly used for surgical implants owing to their high strength, high corrosionresistance, superior wear behavior, and modest biocompatibility. Generally, the Co-Cr-Mo alloys arepredominately composed of a face-centered cubic (fcc) phase; γ-phase. Thermodynamically, however, theγ-phase is the stable phase only at high temperatures, and it transforms into the hexagonal close-packed (hcp)structure; ε-phase, by the heat-treatment at low temperatures. Many studies on the mechanical properties of Co-Cr-Mo alloys have been conducted using polycrystals. However, the deformation behavior of Co-Cr-Moalloys is complex, because it is affected by numerous parameters such as the grain size, texture, heat-treatmentcondition etc. in the polycrystalline form. Thus, a study using a single crystal is strongly required to understandthe mechanisms that control the deformation behavior from the fundamental point of view. In this presentation,the deformation behaviors of the γ-phase and ε-phase clarified by using their single crystals are described.