Hardening by point defects in neutron irradiated AIN and SIC

Takayoshi Iseki, Mitsuharu Tezuka, Chang Sam Kim, Tetsuya Suzuki, Hisayuki Suematsu, Toyohiko Yano

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


Pressureless-sintered AIN and hot-pressed, pressureless-sintered and reaction-bonded SiC were neutron irradiated at temperatures between 100 and 785°C up to a fluence of 5.2xlO24n/m2.The hardness was increased by up to 51% in AIN and 9A% in SiC. The hardness decreased after annealing at temperatures around the irradiation temperature. At the same temperatures, the macroscopic length, which was increased by irradiation, also began to decrease. The hardness and length were almost recovered after 1,200-1,400°C annealing. Thus, hardening in irradiated AIN and SiC is controlled by the number of point defects, or, more precisely, by the strain caused by small point defect clusters which pin down dislocation movement. Dislocation loops were still observed in some samples after 1,400°C annealing while the hardness was almost recovered to that in the unirradiated state. Thus, the existence of dislocation loops is not grounds for hardening in irradiated AIN and SiC.

Original languageEnglish
Pages (from-to)68-77
Number of pages10
JournalJournal of Nuclear Science and Technology
Issue number1
Publication statusPublished - 1993 Jan
Externally publishedYes


  • Aluminium nitrides
  • Annealing
  • Defect cluster
  • Dislocation
  • Dislocation loop
  • Hardening
  • Neutron irradiation
  • Point defects
  • Silicon carbides
  • Swelling
  • Temperature dependence
  • Vickers hardness

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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