Abstract
Radiation induced void swelling is one of the key problems in alloy development for fusion reactors. The objectives of this study are to clarify the elemental process of void swelling, the effect of pre-injected helium, the effect of rhenium addition and the dependence on damage rate of void swelling in molybdenum alloys at elevated temperatures up to 1350K by means of in-situ observation under HVEM. Cascade damages due to He pre-injection make void nuclei together with He atoms and thus the incubation time for void growth becomes very short. Rhenium addition is effective in suppressing void swelling and also with the effectiveness in qualifying mechanical properties, Re is considered to be a very useful alloying element to molybdenum.
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