TY - GEN
T1 - Four-dimensional observation of ductile fracture in sintered iron using synchrotron x-ray laminography
AU - Ozaki, Y.
AU - Mugita, Y.
AU - Aramaki, M.
AU - Furukimi, O.
AU - Ooue, S.
AU - Jiang, F.
AU - Tsuji, T.
AU - Takeuchi, A.
AU - Uesugi, M.
AU - Ashizuka, K.
N1 - Publisher Copyright:
© European Powder Metallurgy Association (EPMA).
PY - 2020
Y1 - 2020
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:85084162635
T3 - Euro PM 2018 Congress and Exhibition
BT - Euro PM 2018 Congress and Exhibition
PB - European Powder Metallurgy Association (EPMA)
T2 - European Powder Metallurgy Congress and Exhibition, Euro PM 2018
Y2 - 14 October 2018 through 18 October 2018
ER -