In-situ annealing of self-ion irradiation damage in tungsten

摘要: In our earlier work [1] microstructural evolution in tungsten under self-ion irradiation was investigated as a function of temperature and dose by in-situ 150 keV W+ ion irradiations on the IVEM-Tandem facility at Argonne National Laboratory (ANL). The present focuses thermal stability this damage. Thin foils were irradiated room (R.T.) to fluences up 1018 W+m−2 (~ 1.0 dpa) then annealed for 120 min temperatures between 300 800°C. We found that: (1) loops with Burgers vectors 1/2 coexist during annealing; (2) is not stable loop configuration above 300°C fraction such decreased increasing and/or time; (3) changes populations annealing very sensitive temperature, but less time. majority occurred within 15 min, associated loss small (1-2 nm) dislocation loops. origin these trends discussed considering defect mobility energetics configurations predicted previous DFT calculations [2].