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1 Prace Naukowe. Chemia i Ochrona Środowiska / Akademia im. Jana Długosza w Częstochowie

1 2005

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Positron annihilation in poly- and monocrystalline silver deformed by uniaxial tension

Rudzińska W., Szuszkiewicz M., Kluza A. A., Bujnarowski G., Pająk J.

Prace Naukowe. Chemia i Ochrona Środowiska / Akademia im. Jana Długosza w Częstochowie

2005

Vol. 10

157-160

Angular distributions of the positron annihilation quanta was measured for polycrystalline and monocrystalline silver samples oriented in (111) and (100) direction, deformed by uniaxial tension up to different deformation degrees. The S parameter as a function of deformation degree and the S parameter as a function of the W parameter has been determined. The data obtained for monocrystalline samples was found that the dynamics of the dislocation and vacancy generation, during the sliding of some crystallographic planes, depends on the crystallographic direction. The data obtained for polycrystalline silver samples elongated up to different elongation degrees indicate that in the proportionality and limited proportionality regions the changes in the physical properties of silver are governed mainly by generation of vacancies and formation and kinetics of transformations of vacancy clusters occurring first of all on the grain boundaries of monocrystallites. In the region of plastic deformations the dominant defects are dislocations and vacancies and their aggregates generated due to the formation and movement of the dislocation of the primary and secondary slip.