Radiation damage analysis in SiC microstructure by transmission electron microscopy
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Microstructures of monolithic high purity SiC and SiC with sintering additives after neutron irradiation toa fluence of 2.0e2.5 1024 n/m2 (E > 0.1 MeV) at 333e363 K and after post-irradiation annealing up to1673 K were observed using a transmission electron microscopy. Results showed that no black spotdefects or dislocation loops in SiC grains were found after the neutron irradiation for all of the specimensowing to the moderate fluence at low irradiation temperature. Thus, it is confirmed that these specimenswere swelled mostly by the formation of point defects. Black spots and small dislocation loops werediscovered only after the annealing process in PureBeta-SiC and CVD-SiC, where the swelling almostdiminished. Anomalous-shaped YAG grains were found in SiC ceramics containing sintering additives. These grains contained dense black spots defects and might lose crystallinity after the neutron irradiation,while these defects may annihilate by recrystallization during annealing up to 1673 K. Amorphousgrain boundary phase was also presented in this ceramic, and a large part of it was crystallized throughpost-irradiation annealing and could affect their recovery behavior.
Abstract
Microstructures of monolithic high purity SiC and SiC with sintering additives after neutron irradiation toa fluence of 2.0e2.5 1024 n/m2 (E > 0.1 MeV) at 333e363 K and after post-irradiation annealing up to1673 K were observed using a transmission electron microscopy. Results showed that no black spotdefects or dislocation loops in SiC grains were found after the neutron irradiation for all of the specimensowing to the moderate fluence at low irradiation temperature. Thus, it is confirmed that these specimenswere swelled mostly by the formation of point defects. Black spots and small dislocation loops werediscovered only after the annealing process in PureBeta-SiC and CVD-SiC, where the swelling almostdiminished. Anomalous-shaped YAG grains were found in SiC ceramics containing sintering additives. These grains contained dense black spots defects and might lose crystallinity after the neutron irradiation,while these defects may annihilate by recrystallization during annealing up to 1673 K. Amorphousgrain boundary phase was also presented in this ceramic, and a large part of it was crystallized throughpost-irradiation annealing and could affect their recovery behavior.
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