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

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    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.

    Original languageEnglish
    Title of host publicationEuro PM 2018 Congress and Exhibition
    PublisherEuropean Powder Metallurgy Association (EPMA)
    ISBN (Electronic)9781899072507
    Publication statusPublished - Jan 1 2020
    EventEuropean Powder Metallurgy Congress and Exhibition, Euro PM 2018 - Bilbao, Spain
    Duration: Oct 14 2018Oct 18 2018

    Publication series

    NameEuro PM 2018 Congress and Exhibition

    Conference

    ConferenceEuropean Powder Metallurgy Congress and Exhibition, Euro PM 2018
    Country/TerritorySpain
    CityBilbao
    Period10/14/1810/18/18

    All Science Journal Classification (ASJC) codes

    • Metals and Alloys
    • Surfaces, Coatings and Films
    • Surfaces and Interfaces

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