Abstract
Single-crystal forms of MgAl 2O 4, Y 3A1 5O 12 and A1 2O 3 were irradiated in the EBR-II fast fission reactor to a fluence of 0.3 × 10 26 n/m 2 at 1015 K, and to ~1–2×10 26 n/m 2 at 925 and 1100 K. Fracture toughness was subsequently measured at room temperature by an indentation technique, and radiation-induced defect aggregates were characterized by transmission electron microscopy. A slight increase in toughness of MgAl 2O 4 was observed and attributed to interaction of cracks with strain fields around dislocation loops. No significant change was noted for Y 3Al 5O 12, despite the presence of a high concentration of unresolved defect clusters. Fracture toughness of A1 2O 3 was markedly increased, with the enhancement apparently attributable in large part to impedance of crack propagation by interaction with the irradiation-induced void lattice.
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