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H. Matsui, K. Fukumoto, T. Nagumo and N. Nita
Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, 980-8577, Japan
Abstract. During startup of fusion reactors, materials are exposed to neutron
irradiation under non-steady temperature condition. Since the temperature of
irradiation has decisive effects on the microstructural evolution, the
non-steady temperature will have important consequences in the performance of
fusion reactor materials. In the present study, a series of vanadium based
alloys have been irradiated with neutrons in a temperature cycling
condition. It has been found from this study that cavity number density is
much greater in temperature cycled specimens than in steady temperature
irradiation. Keeping the upper temperature constant, cavity number density is
greater for smaller difference between the upper and the lower
temperature. It follows that relatively small temperature excursions may have
rather significant effects on the fusion material performance in service.
IAEA 2001
