Void Formation in Magnesium Aluminate Spinel Heavily Irradiated with Fast Neutrons

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Single crystals of magnesium aluminate spinel (MgAl<SUB>2</SUB>O<SUB>4</SUB>) were heavily irradiated to fission neutron fluences from 1×10<SUP>26</SUP> to 2×10<SUP>27</SUP>n/m<SUP>2</SUP> (E>0.1MeV) at 658 and 1, 023K in FFTF (Fast Flux Test Facility) to investigate their microstructural evolution under heavy neutron irradiation and to confirm their previously observed resistance to void swelling. At 658K no voids were observed up to 2.29×10<SUP>27</SUP>n/m<SUP>2</SUP>, but 1/4[110] interstitial loops were formed. These loops changed their habit planes from (111) to (110) with increasing neutron fluence. At 1, 023K the 1/4[110] type of interstitial loops grew to form stacking fault networks composed of stacking faults on each of the six equivalent {110} planes. Tiny voids were also observed to form preferentially on or near stacking faults after 1.37×10<SUP>27</SUP>n/m<SUP>2</SUP>. A limited number of very small cavities, con- tributing to a volumetric swelling of only 0.07%, were also observed in the crystal matrix after 2.17×10<SUP>27</SUP>n/m<SUP>2</SUP>. The possible mechanisms of suppression of void formation in MgAl<SUB>2</SUB>O<SUB>4</SUB> are discussed.

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  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 32(8), 773-778, 1995-08-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002072927
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • データ提供元
    CJP書誌  J-STAGE 
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