Microstructural analysis of biomedical Co-Cr-Mo alloy subjected to high-pressure torsion processing

Murat Isik, Mitsuo Niinomi, Ken Cho, Masaaki Nakai, Junko Hieda, Hakan Yilmazer, Zenji Horita, Takayuki Narushima

    研究成果: Chapter in Book/Report/Conference proceedingConference contribution

    抄録

    The effect of high-pressure torsion (HPT) processing on the microstructure and Vickers hardness of Co-Cr-Mo (CCM) alloys were investigated in this study. The microstructure of initial CCM alloy contains equiaxed grains with a grain diameter of approximately 50 μm and twins. The clear grain boundaries of equiaxed grains and twins disappear after HPT processing at a rotation number, N, of 10. The phase maps of initial CCM alloy and CCM alloy subjected to HPT processing at N = 5 measured by electron backscatter diffraction exhibit that the ratio of γ phase decreases from 93.5% to 34.1% and the ratio of ε phase increases from 6.5% to 65.9% by applying HPT processing. These results indicate that the ε phase is formed by high-strain, which is induced by the HPT processing. The Vickers hardness values on the surfaces of the CCM alloys subjected to HPT processing at N = 1, 5, and 10 increase with increasing the equivalent strain, εeq. These results suggest that an increase of Vickers hardness is correlated to an increase of the ratio of ε phase and the dislocation density, and grain refinement, which are caused by the high-strain induced by HPT processing.

    本文言語英語
    ホスト出版物のタイトルAdvanced Ceramics and Novel Processing
    出版社Trans Tech Publications Ltd
    ページ263-269
    ページ数7
    ISBN(印刷版)9783038351306
    DOI
    出版ステータス出版済み - 2014
    イベント5th International Symposium on Advanced Ceramics, ISAC 2013 and 3rd International Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2013 - Wuhan, 中国
    継続期間: 12 9 201312 12 2013

    出版物シリーズ

    名前Key Engineering Materials
    616
    ISSN(印刷版)1013-9826
    ISSN(電子版)1662-9795

    その他

    その他5th International Symposium on Advanced Ceramics, ISAC 2013 and 3rd International Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2013
    国/地域中国
    CityWuhan
    Period12/9/1312/12/13

    All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 材料力学
    • 機械工学

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