Point Defect Hardening in MgO·3Al2O3

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

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

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
Volume75
Issue number7
DOIs
Publication statusPublished - 1992
Externally publishedYes

Fingerprint

Point defects
Hardening
Hardness
Annealing
Neutron irradiation
Irradiation
Vickers hardness
Yield stress
spinell
Temperature

Keywords

  • defects
  • dislocations
  • hardening
  • irradiation
  • spinels

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Point Defect Hardening in MgO·3Al2O3 . / Suematsu, Hisayuki; Iseki, Takayoshi; Yano, Toyohiko; Saito, Yasutoshi; Suzuki, Tetsuya; Mori, Tsutomu.

In: Journal of the American Ceramic Society, Vol. 75, No. 7, 1992, p. 1742-1747.

Research output: Contribution to journalArticle

Suematsu, H, Iseki, T, Yano, T, Saito, Y, Suzuki, T & Mori, T 1992, 'Point Defect Hardening in MgO·3Al2O3 ', Journal of the American Ceramic Society, vol. 75, no. 7, pp. 1742-1747. https://doi.org/10.1111/j.1151-2916.1992.tb07191.x
Suematsu, Hisayuki ; Iseki, Takayoshi ; Yano, Toyohiko ; Saito, Yasutoshi ; Suzuki, Tetsuya ; Mori, Tsutomu. / Point Defect Hardening in MgO·3Al2O3 In: Journal of the American Ceramic Society. 1992 ; Vol. 75, No. 7. pp. 1742-1747.
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AU - Mori, Tsutomu

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