Abstract
Irradiation-induced embrittlement is one of the major problems with molybdenum alloys, which have been considered as one of the candidates for divertor structural materials. The effects of rhenium content, heat-treatment and irradiation condition on mechanical properties and microstructural development of molybdenum rhenium alloys were studied after neutron exposure by FFTF/MOTA up to high fluence (∼1 × 10 27 n/m 2, En>0.1 MeV). Appreciable plastic deformation was observed in a bending test on stress-relieved Mo–5 wt% Re irradiated at high temperatures. Fine, dense precipitates were observed in Mo–41 wt% Re, resulting in large hardening and embrittlement.
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