DISLOCATION AND DEFECT DENSITIES BY PAT IN 2024 AIRCRAFT MATERIAL USING TWO DIFFERENT ACTIVITY SOURCES

M. A. Abdel-Rahman, M. S. Abdallah and Emad A. Badawi ()
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M. A. Abdel-Rahman: Faculty of Science, Physics Dept., El-Minia University, Egypt
M. S. Abdallah: Faculty of Science, Physics Dept., El-Minia University, Egypt
Emad A. Badawi: Faculty of Science, Physics Dept., El-Minia University, Egypt

Surface Review and Letters (SRL), 2005, vol. 12, issue 03, 463-468

Abstract: Positron annihilation lifetime spectroscopy (PALS) is a nuclear technique used in material science. Positron annihilation lifetime technique (PALT) measurements are used to study the behavior of defect concentration and dislocation density in a set of 2024 aluminum alloy. It has been shown that positrons can become trapped at imperfect locations in solids and their mean lifetime can be influenced by changes in the concentrations of such defects. No changes were observed in the mean lifetime after defect concentration became saturated. The mean lifetime and trapping rates for the samples deformed up to 36.4 percent. The concentration of defects range from 1.133 × 1016to 2.061 × 1018cm-3at strains from 1.7 to 22.7%.

Keywords: Defect concentration; dislocation density; trapping rate; effective trapping rate; 2024 alloy; positron annihilation lifetime technique (search for similar items in EconPapers)
Date: 2005
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DOI: 10.1142/S0218625X05007165

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