DETECTING DEFECTS IN AIRCRAFT MATERIALS BY NUCLEAR TECHNIQUE (PAS)

Emad. A. Badawi ()
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Emad. A. Badawi: Faculty of Science, Physics Department, El-Minia University, Egypt

Surface Review and Letters (SRL), 2005, vol. 12, issue 01, 1-6

Abstract: Positron annihilation spectroscopy (PAS) is one of the nuclear techniques used in material science. The present measurements are used to study the behavior of defect concentration in one of the most important materials aluminum alloys which is the 7075 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 concentration of such defects. No changes have been observed in the mean lifetime values after the saturation of defect concentration. The mean lifetime and trapping rates are studied for samples deformed up to 58.3%. The concentration of defect range vary from1015to1018cm-3at the thickness reduction from 2.3 to 58.3%. The dislocation density varies from108to1011cm/cm3.

Keywords: Defect concentration; dislocation density; trapping rate; trapping cross-section; aircraft alloy; positron annihilation lifetime technique (search for similar items in EconPapers)
Date: 2005
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DOI: 10.1142/S0218625X05006718

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