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The microstructural evolution of neutron irradiated Nb-lZr alloy at 693-1003K to doses as high as 47.2dpa has been investigated. At all irradiation conditions, strong void swelling resistance was foun...d. In the cold worked and aged specimens, voids of about 50nm diameter were observed at lower temperature (693K) and higher temperature ranges (918-1003K), but not at intermediate temperature ranges (744-842K). The void density increased with dose at all irradiation conditions. The swelling behavior obtained by density measurements was revealed to be rather complex, depending on irradiation temperature and dose. The complex role of starting condition on both microstructural evolution and density changes are presumably due to phase-related changes during irradiation.show more
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