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
CountrySpain
CityBilbao
Period10/14/1810/18/18

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All Science Journal Classification (ASJC) codes

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

Cite this

Ozaki, Y., Mugita, Y., Aramaki, M., Furukimi, O., Ooue, S., Jiang, F., ... Ashizuka, K. (2020). Four-dimensional observation of ductile fracture in sintered iron using synchrotron x-ray laminography. In Euro PM 2018 Congress and Exhibition (Euro PM 2018 Congress and Exhibition). European Powder Metallurgy Association (EPMA).