Deuterium retention in rhenium-doped tungsten

Deuterium retention in rhenium doped tungsten (W-Re) was investigated by means of the thermodesorption technique. W-Re alloys of different structures and concentrations of Re were investigated. All tungsten rhenium alloys had a common structural feature - micron size voids in the bulk. The samples were irradiated by 200 eV deuterium ions in the fluence range 10(22)-10(24) D/m(2). The thermodesorption spectra of polycrystalline W measured with a linear ramp of 5 K/s has two peaks at similar to 450 and 650 K. In TDS of W-Re alloys an additional high-temperature peak was found at 850 K. The observed retention in W-Re alloys depends strongly on materials structure. In the range of 1-10%Re admixture the Re concentration in W-Re alloy does not influence noticeably the deuterium retention. Structure changes (filling of voids in material) was found to take place both at annealing and low-energy deuterium irradiation. (c) 2007 Elsevier B.V. All rights reserved.