Four-dimensional observation of ductile fracture in sintered iron using synchrotron x-ray laminography

Y. Ozaki, Y. Mugita, M. Aramaki, O. Furukimi, S. Ooue, F. Jiang, T. Tsuji, A. Takeuchi, M. Uesugi, K. Ashizuka

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

    抄録

    Synchrotron X-ray laminography was used to reveal the time evolution of the three-dimensional (3D) morphology of micropores in sintered iron during a tensile test. 3D snapshots showed networked open pores growing wider than 20 µm along the tensile direction, resulting in internal necking of the specimen. Finally, these pores initiated cracks perpendicular to the tensile direction by coalescing with surrounding preexisting microvoids or secondary-generated voids immediately before fracture. Topological analysis of the barycentric positions of these microvoids showed that they formed two-dimensional networks within a ~20 µm-radius area. This indicates that microvoid coalescence could occur on shear planes formed close to the enlarged open pores or between closed pores by strain accumulation and play an important role in crack initiation.

    本文言語英語
    ホスト出版物のタイトルEuro PM 2018 Congress and Exhibition
    出版社European Powder Metallurgy Association (EPMA)
    ISBN(電子版)9781899072507
    出版ステータス出版済み - 1 1 2020
    イベントEuropean Powder Metallurgy Congress and Exhibition, Euro PM 2018 - Bilbao, スペイン
    継続期間: 10 14 201810 18 2018

    出版物シリーズ

    名前Euro PM 2018 Congress and Exhibition

    会議

    会議European Powder Metallurgy Congress and Exhibition, Euro PM 2018
    国/地域スペイン
    CityBilbao
    Period10/14/1810/18/18

    All Science Journal Classification (ASJC) codes

    • 金属および合金
    • 表面、皮膜および薄膜
    • 表面および界面

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