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

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.

Automated summary

The evolution of point defects in cold-rolled tungsten samples was studied using positron annihilation spectroscopy and transmission electron microscopy. It was found that there was a correlation between the intensity of mono-vacancy-like lifetime and the initial stages of recrystallization at 1373 K annealing temperature, while the formation of large vacancy clusters was observed at higher annealing temperatures around 2000 K, exceeding the defect recovery temperature in tungsten.