|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Evolution of Stacking Faults during Thermomechanical Processing of Biomedical Co–Cr–Mo Alloys Studied by X-ray Diffraction Line-profile Analysis
||Kenta Yamanaka, Mmanami Mori, Kazuo Yoshida, Shigeo Sato, Akihiko Chiba
|On-Site Speaker (Planned)
The strengthening of biomedical Co−Cr−Mo alloys is of crucial importance to the improvement of the durability of orthopedic implants. In this study, we evaluated the evolution of lattice defects during thermomechanical processing of biomedical Co−Cr−Mo alloy by X-ray diffraction line-profile analysis. An extremely high yield strength (~1500 MPa) and good ductility (>10%) were obtained simultaneously by multipass hot rolling. Dynamic recrystallization to produce finer grains and accumulation of dislocations occurred simultaneously during the process. Furthermore, we captured a substantial increase in the amount of stacking faults (SFs) in the fcc γ-matrix in particular at higher deformation rate. Physical modeling demonstrated that the contribution of the accumulated SFs (i.e., the reduction in SF spacing) explains the entire strengthening behavior of the alloys. The competitive behavior between accumulation of lattice defects and grain refinement during the hot-deformation processing was also examined in relation to the initial grain size.
||Planned: Supplemental Proceedings volume