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Kinetics and evolution of WRe platelets in irradiated W–Re alloys in fusion power plant

Abstract A recent theory of WRe platelet formation in irradiated W–Re alloys is applied to the plasma facing surfaces (composed of W) in a conceptual fusion power plant, where the 14 MeV neutron irradiation transforms some of the W atoms to Re (and Os). In the first wall material, numerous small platelets of multiple WRe dumbbells are expected to form and to strongly harden and severely embrittle the metal, e.g. increase its ductile–brittle transition temperature by ∼350 K. At the higher temperature of the divertor material, the thermal instability of small multiples leads to a nucleation difficulty so that only an almost negligible number of platelets is expected to form and thus, give almost no hardening and embrittling effects.