Measurements of positron lifetime and hydrogen solubility were made in deformed polycrystalline Pd to investigate thermally-activated recovery. A strong correlation as a function of isochronal annealing temperature was observed between trapped-positron lifetime and the enhancement of hydrogen solubility
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چکیده
Measurements of positron lifetime and hydrogen solubility were made in deformed polycrystalline Pd to investigate thermally-activated recovery. A strong correlation as a function of isochronal annealing temperature was observed between trapped-positron lifetime and the enhancement of hydrogen solubility due to solute binding at dislocations. This correlation is attributed to the simultaneous recovery of divacancies and dislocations versus annealing temperature. First principles calculations of positron lifetime at various defects in Pd support this conclusion. In situ transmission electron microscopy analysis demonstrates that significant dislocation recovery occurs between 450 and 600K in deformed polycrystalline Pd, and that low-angle tilt boundaries form above ~600K that persist to ~800K.
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