Microstructure control of biomedical Co-Cr alloy by introducing high density of lattice defects

2016 Fiscal Year Final Research Report

• Project/Area Number: 26870050
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Material processing/Microstructural control engineering; Structural/Functional materials
• Research Institution: Tohoku University
• Principal Investigator: Yamanaka Kenta 東北大学, 金属材料研究所, 助教 (30727061)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 生体用Co-Cr合金 / 熱間加工 / 転位組織 / 放射光回折 / ラインプロファイル解析 / マルテンサイト変態 / 力学特性

Outline of Final Research Achievements

In this study, we present a novel concept for strengthening biomedical Co-Cr alloys by introducing high density of lattice defects. A high tensile/fatigue strength was obtained in Co-Cr-Mo alloy specimens prepared with multipass hot rolling. Using X-ray diffraction line profile analysis, we demonstrated that the overall strengthening achieved in the proposed process cannot be explained by considering grain refinement and dislocation densities and revealed a significant contribution of stacking faults in the developed alloys.

Free Research Field

材料加工・組織制御工学