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Improved high temperature radiation damage tolerance in a three-phase ceramic with heterointerfaces.

  • Author(s): Ohtaki, Kenta K
  • Patel, Maulik K
  • Crespillo, Miguel L
  • Karandikar, Keyur K
  • Zhang, Yanwen
  • Graeve, Olivia A
  • Mecartney, Martha L
  • et al.
Abstract

Radiation damage tolerance for a variety of ceramics at high temperatures depends on the material's resistance to nucleation and growth of extended defects. Such processes are prevalent in ceramics employed for space, nuclear fission/fusion and nuclear waste environments. This report shows that random heterointerfaces in materials with sub-micron grains can act as highly efficient sinks for point defects compared to grain boundaries in single-phase materials. The concentration of dislocation loops in a radiation damage-prone phase (Al2O3) is significantly reduced when Al2O3 is a component of a composite system as opposed to a single-phase system. These results present a novel method for designing exceptionally radiation damage tolerant ceramics at high temperatures with a stable grain size, without requiring extensive interfacial engineering or production of nanocrystalline materials.

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