Observations of Point Defect Dynamics in the Recrystallization of Cold-rolled Tungsten Foils

摘要

The evolution of point defects with annealing temperature is investigated in cold-rolled tungsten samples using positron annihilation spectroscopy and transmission electron microscopy. We report a correlation between the unexpectedly high intensity of mono-vacancy-like lifetime (201 ps) observed at 1373 K annealing temperature and the initial stages of recrystallization. The formation of large vacancy clusters is also observed at higher annealing temperatures (similar to 2000 K), well beyond the defect recovery temperature in tungsten. (C) 2020 Elsevier B.V. All rights reserved.