Abstract
The development of low-activation alloys is one of the goals of the materials program of the US Magnetic Fusion Energy Program. Irradiation of two series of such alloys has commenced in FFTF. One series is based on austenitic steels with manganese substituting for nickel, and the other is based on ferritic steels with vanadium and/or tungsten substituting for molybdenum and niobium. In addition to the irradiation experiments, parallel studies on corrosion resistance in flowing lithium, preirradiation ductility and thermal stability are also in progress. This paper reviews the results of irradiation at 420 to 600°C to 15 dpa and also describes the early results of the ex-reactor studies.
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