TY - JOUR
T1 - Mechanical properties and microstructure of α-alumina and magnesium aluminate spinel irradiated with He ions
AU - Izumi, Koichiro
AU - Yasuda, Kazuhiro
AU - Kinoshita, Chiken
AU - Kutsuwada, Masanori
N1 - Funding Information:
This work was supported in part by Grant-in-Aid for Scientific Research (A) from the Ministry of Education, Science, Sports and Culture in Japan and Iketani Science and Technology Foundation.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 1998/10
Y1 - 1998/10
N2 - Mechanical properties of α-alumina, stoichiometric- and nonstoichiometric-magnesium aluminate spinel single crystals were examined by using ultra-microhardness technique. The samples were irradiated with 100 keV He+ ions at temperatures of 300-870 K and to fluences up to 2 × 1020 He+/m2. Apparent hardness, ΔH, in α-alumina increases with fluence in three stages, while that of spinel crystals increases monotonically with fluence. We have also evaluated elastic modulus, plastic and elastic energies, and plastic and elastic indentation depths through the analysis of load-displacement curves. These analyses showed that plastic and elastic hardening are responsible for the variation of ΔH of α-alumina, and that plastic hardening is the main cause of hardening in spinel crystals. Corresponding TEM observations suggested the importance of point defects and/or 'invisible' defect clusters for radiation hardening compared to 'visible' dislocation loops. The relationship between microstructure and mechanical properties is given for various ceramics.
AB - Mechanical properties of α-alumina, stoichiometric- and nonstoichiometric-magnesium aluminate spinel single crystals were examined by using ultra-microhardness technique. The samples were irradiated with 100 keV He+ ions at temperatures of 300-870 K and to fluences up to 2 × 1020 He+/m2. Apparent hardness, ΔH, in α-alumina increases with fluence in three stages, while that of spinel crystals increases monotonically with fluence. We have also evaluated elastic modulus, plastic and elastic energies, and plastic and elastic indentation depths through the analysis of load-displacement curves. These analyses showed that plastic and elastic hardening are responsible for the variation of ΔH of α-alumina, and that plastic hardening is the main cause of hardening in spinel crystals. Corresponding TEM observations suggested the importance of point defects and/or 'invisible' defect clusters for radiation hardening compared to 'visible' dislocation loops. The relationship between microstructure and mechanical properties is given for various ceramics.
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U2 - 10.1016/S0022-3115(98)00298-0
DO - 10.1016/S0022-3115(98)00298-0
M3 - Article
AN - SCOPUS:0032180283
VL - 258-263
SP - 1856
EP - 1860
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
IS - PART 2 B
ER -