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Positron Annihilation in Steel Samples Deformed by Uniaxial Tension

100%
Rudzińska W., Szuszkiewicz M., Bujnarowski G., Kluza A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 5
1507-1510
EN
Angular distributions of the positron annihilation quanta were measured for steel ST2 SAL samples deformed by uniaxial tension up to different deformation degrees. The dependences of the S parameter on the relative elongation of the samples are presented. The positron annihilation data for steel are compared with the results obtained previously for polycrystalline iron samples deformed by uniaxial tension up to different deformation degrees in the proportionality and limited proportionality regions.
2
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Investigation of the Absorption of Annihilation Quanta in Solid and Liquid Ga and BiSn Alloy

100%
Kluza A., Rudzińska W., Szuszkiewicz M.
Acta Physica Polonica A
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2001
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vol. 99
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issue 3-4
407-413
EN
Absorption of positron annihilation quanta in Ga and Bi_{40}Sn_{60} alloy in the solid and the liquid phase was investigated. It was found that the mechanism of absorption of annihilation quanta changes on passing from the solid to the liquid state. Results of measurements for Ga and Bi_{40}Sn_{60} alloy show that for metals changing their density at the melting point the photopeak profiles are modified: their centers of gravity in liquid phase are displaced with respect to those in the solid phase and the number of counts under the photopeak changes, too.
3
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Positron Lifetime in Hostaphan

100%
Kostrzewa M., Bujnarowski G., Kluza A., Szuszkiewicz M.
Acta Physica Polonica A
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2006
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vol. 110
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issue 5
615-620
EN
Positron lifetime measurements in hostaphan RNK, used for encapsulation of ^{22}Na positron sources, were performed. It was found that the parameter of positron lifetime spectra in hostaphan RNK differ markedly from those for other forms of polyethylene terephthalate. The maximum penetration depth of positrons from RNK hostaphan amounts 0.42 mm. The information gained in the present study is of great importance for experimenters using hostaphan RNK for encapsulation of positron sources.
4
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Positron Annihilation in Polycrystalline Metals Deformed by Uniaxial Tension

88%
Rudzińska W., Pająk J., Szuszkiewicz M., Bujnarowski G., Kluza A.
Acta Physica Polonica A
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2005
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vol. 107
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issue 5
857-863
EN
Angular distributions of the positron annihilation quanta were measured for polycrystalline samples deformed by uniaxial tension up to different deformation degrees. The S parameter as a function of the W parameter was determined. The data obtained for samples elongated up to different elongation degrees indicate that in the proportionality and limited proportionality regions the changes in the physical properties of samples are governed mainly by generation of vacancies and formation and kinetics of transformations of vacancy clusters occurring first of all on the grains 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. The positron annihilation data are corroborated by the results of the resistometric and tensometric measurements in the proportionality and limited proportionality regions.
5
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Positron Annihilation in Metals Defected by Action of the Tensile Force

88%
Rudzińska W., Pająk J., Szuszkiewicz M., Bujnarowski G., Kluza A.
Acta Physica Polonica A
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2006
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vol. 110
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issue 5
691-699
EN
Results of experimental investigations of uniaxially elongated mono- and polycrystalline samples of several metals (Fe, Ta, Pd, Ag, and Au), performed using the positron annihilation methods, are reviewed. The dependences of the S-parameters and positron lifetimes on the relative elongation of the samples were presented. The data obtained for polycrystalline samples indicate that in the proportionality and limited proportionality regions the changes in the physical properties are governed mainly by generation of vacancies and by kinetics of formation and 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 dislocations of the primary and secondary slip. In the case of monocrystalline samples it was found that the dynamics of the dislocations and vacancy generation during the sliding of some crystallographic planes depends on the crystallographic direction.
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