Point Defect Hardening in MgO·3Al2O3
作者:
Hisayuki Suematsu,
Takayoshi Iseki,
Toyohiko Yano,
Yasutoshi Saito,
Tetsuya Suzuki,
Tsutomu Mori,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 7
页码: 1742-1747
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb07191.x
出版商: Blackwell Publishing Ltd
关键词: hardening;spinels;dislocations;irradiation;defects
数据来源: WILEY
摘要:
Vickers hardness in spinel increases by 23% after neutron irradiation to a fluence of 8.3 × 1022n/m2at 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 × 1024n/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/cm3are 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
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