Vanadium alloys have a number of attractive features for fusion reactor structural applications. Their inherent low induced radioactivity, high operating temperature, high thermal stress factor and superior resistance against radiation damage are essential for the attractiveness of fusion systems. The emphasis of recent venadium studies has been on alloy compositions centred about V-4Cr-4Ti. These alloys have a very low ductile to brittle transition temperature (DBTT) and good high temperature mechanical properties. Among a number of radiation induced effects, swelling, DBTT shift and helium embrittlement may be the most important phenomena for fusion structural materials.
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