Abstract
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 (~ 2000 K), well beyond the defect recovery temperature in tungsten.
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