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Effect of Neutron Irradiation on Knoop Microhardness Anisotropy in MgO·3Al 2 O 3 Single Crystals
Author(s) -
Yano Toyohiko,
Ikari Masanori,
Iseki Takayoshi,
Farnum Eugene H.,
Clinard Frank W.,
Mitchell T. E.
Publication year - 1995
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1995.tb08839.x
Subject(s) - knoop hardness test , irradiation , materials science , indentation hardness , indentation , slip (aerodynamics) , crystallography , neutron , anisotropy , analytical chemistry (journal) , composite material , optics , chemistry , microstructure , nuclear physics , physics , chromatography , thermodynamics
MgO·3Al 2 O 3 single crystals were irradiated with neutron fluences of 8.3 × 10 22 n/m 2 at 100°C and 2.4 × 10 24 n/m 2 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·3Al 2 O 3 , 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.