الفهرس 
Chapter 1 : IntroductionOnly 14 pages are availabe for public view
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Abstract
There are many traditional techniques that are used in materials science such as (TEM, OM, STM, STM, etc…). Positron annihilation spectroscopy (PAS) has the property over all these techniques that it can detect the smallest defect size and concentration with high efficiency. This was the reason in using PAS to determine defect properties for the 3005 and 8006 wrought Al alloys under the effect of cold work (definitely compression) and heat treatment (definitely quenching). The mechanical properties of these alloys were studied using Vickers hardness test as a comparative technique.
The effect of cold work or plastic deformation was studied by Positron annihilation lifetime spectroscopy (PALS). The studied alloys showed increase behavior for the value of the positron lifetime with the thickness reduction till about 10.00 % for 3005 Al alloy and about 16.00 % for 8006 Al alloy where saturation in the lifetime occur. Relating the experimental results with the theoretical models lead to determining.