Point Defect Hardening in MgO·3Al2O3

Hisayuki Suematsu, Takayoshi Iseki, Toyohiko Yano, Yasutoshi Saito, Tetsuya Suzuki, Tsutomu Mori

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Vickers hardness in spinel increases by 23% after neutron irradiation to a fluence of 8.3 × 1022 n/m2 at 100°C. Annealing at high temperatures above 100°C gradually decreases the hardness. Above 500°C, the hardness is reduced to almost the same value as that of unirradiated material. The hardness of spinel, irradiated at 470°C to a fluence of 2.4 × 1024 n/m2, is unchanged both after irradiation and after annealing up to 1000°C. The length change during annealing was also measured and is similar to the hardness change. Frank dislocation loops with a density of 3 × 1014/cm3 are induced by neutron irradiation at 470°C but they apparently do not affect the hardening in spinel. Thus, point defects are concluded to act as obstacles against dislocation movement. The yield stress measured at 1400°C is also unchanged after irradiation. It is believed that not only the point defects but also the loops are annihilated by annealing at 1400°C.

Original languageEnglish
Pages (from-to)1742-1747
Number of pages6
JournalJournal of the American Ceramic Society
Issue number7
Publication statusPublished - 1992 Jul
Externally publishedYes


  • defects
  • dislocations
  • hardening
  • irradiation
  • spinels

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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