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

Autor: Ohtaki KK; Department of Chemical Engineering & Materials Science, University of California, Irvine, Irvine, CA, 92697-2575, USA., Patel MK; Department of Mechanical, Materials & Aerospace Engineering, University of Liverpool, Liverpool, L69 3BX, UK.; Department of Materials Science and Engineering, University of Tennessee, Knoxville, Knoxville, 37996-2100, TN, USA., Crespillo ML; Department of Materials Science and Engineering, University of Tennessee, Knoxville, Knoxville, 37996-2100, TN, USA.; Ion Beam Materials Laboratory, University of Tennessee, Knoxville, Knoxville, 37996, TN, USA., Karandikar KK; Department of Mechanical and Aerospace Engineering, University of California, San Diego, San Diego, CA, 92093-0411, USA., Zhang Y; Department of Materials Science and Engineering, University of Tennessee, Knoxville, Knoxville, 37996-2100, TN, USA.; Ion Beam Materials Laboratory, University of Tennessee, Knoxville, Knoxville, 37996, TN, USA., Graeve OA; Department of Mechanical and Aerospace Engineering, University of California, San Diego, San Diego, CA, 92093-0411, USA., Mecartney ML; Department of Chemical Engineering & Materials Science, University of California, Irvine, Irvine, CA, 92697-2575, USA. martham@uci.edu.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2018 Sep 18; Vol. 8 (1), pp. 13993. Date of Electronic Publication: 2018 Sep 18.
DOI: 10.1038/s41598-018-31721-x
Abstrakt: 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 (Al 2 O 3 ) is significantly reduced when Al 2 O 3 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.
Databáze: MEDLINE
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