3D Visualization of Morphological Evolution of Large Defects during Spark Plasma Sintering of Alumina Granules

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  • Gaku Okuma
    Research Center for Structural Materials National Institute for Materials Science (NIMS) Ibaraki 305-0047 Japan
  • Masaya Endo
    Laboratory for Materials and Structures Institute of Innovative Research Tokyo Institute of Technology Yokohama 226-8503 Japan
  • Haruki Minagawa
    Department of Mechanical Engineering Tokyo University of Science 6-3-1 Niijuku Katsushika-Ku Tokyo 125-8585 Japan
  • Ryo Inoue
    Department of Mechanical Engineering Tokyo University of Science 6-3-1 Niijuku Katsushika-Ku Tokyo 125-8585 Japan
  • Hideki Kakisawa
    Research Center for Structural Materials National Institute for Materials Science (NIMS) Ibaraki 305-0047 Japan
  • Takuma Kohata
    Research Center for Structural Materials National Institute for Materials Science (NIMS) Ibaraki 305-0047 Japan
  • Toshio Osada
    Research Center for Structural Materials National Institute for Materials Science (NIMS) Ibaraki 305-0047 Japan
  • Takafumi Yamamoto
    Laboratory for Materials and Structures Institute of Innovative Research Tokyo Institute of Technology Yokohama 226-8503 Japan
  • Masaki Azuma
    Laboratory for Materials and Structures Institute of Innovative Research Tokyo Institute of Technology Yokohama 226-8503 Japan
  • Akihisa Takeuchi
    Japan Synchrotron Radiation Research Institute JASRI/SPring-8, Kouto 1-1-1 Sayo Hyogo 679-5198 Japan
  • Masayuki Uesugi
    Japan Synchrotron Radiation Research Institute JASRI/SPring-8, Kouto 1-1-1 Sayo Hyogo 679-5198 Japan
  • Olivier Guillon
    Institute of Energy and Climate Research IEK-1: Materials Synthesis and Processing Forschungszentrum Jülich GmbH D-52425 Jülich Germany
  • Fumihiro Wakai
    Research Center for Structural Materials National Institute for Materials Science (NIMS) Ibaraki 305-0047 Japan

抄録

<jats:sec><jats:label /><jats:p>The mechanical reliability of products must be assured for scaling up and production of complex‐shaped components by spark plasma sintering (SPS) of spray‐dried granules. The evolution of morphologies of pores and defects, which control the mechanical strength, is investigated by using synchrotron X‐ray multiscale tomography during SPS of alumina granules at 1300 °C. While large defects arising from the hierarchical granule packing structure cannot be removed by pressureless sintering, crack‐like defects and branched rodlike defects are almost eliminated by SPS at stresses higher than 30 and 50 MPa, respectively. But, small ellipsoidal porous regions, which may arise from aggregates or dimples of granules, cannot be removed even at a pressure of 50 MPa. A very large defect is also found by using micro‐CT. It is supposed that this defect is formed from a large void in loosely packed granules. The shrinkage of large voids and the elimination of crack‐like defects are explained by the theoretical prediction based on the continuum theory of sintering.</jats:p></jats:sec>

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