Effect of Neutron Irradiation on Knoop Microhardness Anisotropy in MgO.3Al2O3 Single Crystals

Autor: Terence E. Mitchell, Masanori Ikari, Takayoshi Iseki, Toyohiko Yano, E.H. Farnum, Frank W. Clinard
Rok vydání: 1995
Předmět:
Zdroj: Journal of the American Ceramic Society. 78:1469-1474
ISSN: 1551-2916
0002-7820
DOI: 10.1111/j.1151-2916.1995.tb08839.x
Popis: MgO·3Al2O3 single crystals were irradiated with neutron fluences of 8.3 × 1022 n/m2 at 100°C and 2.4 × 1024 n/m2 at 470°C (E > 1.0 MeV) in the Japan Materials Testing Reactor. The Knoop microhardness of several orientations on the (100) plane of both the irradiated and unirradiated crystals were measured with different indentation loads. The change in hardness profile of the crystals was almost the same after the two irradiation conditions. The hardness increased by 4–15% because of the irradiations depending on the crystallographic orientation, the larger change being observed at orientations between the (001) and (011) directions. While both the {111} and {110} slip systems are simultaneously active in the unirradiated MgO·3Al2O3, the {111} system may be the dominant slip system in the neutron-irradiated crystals. It is concluded that the restriction of the {110} slip system is caused by irradiation-induced interstitial ions.
Databáze: OpenAIRE
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