الفهرس 
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Abstract
Point defects and dislocation are introduced into alloys investigation by various methods:1)plastic deformation at room temperates in order to keep the defect configuration obtained at high temperatures. Several technique are in use to study these defect and their properties(e.g., defect density,recovery stages, migration and formation energies,grain size,concentrations,ect...)
Poistron annihilation techniques have proved to be a very senstivie probe for the investigation of those defects and their properties. Up till now however,most of the positron annihilation work has been done for pure metals.
In this we perform measurements of positron annihilation on some commerical alumminum alloys,two casting alloys which are AlSi11.35Mg0.23and AlSi10.9Mg0.17Sr0.6and another two wrought alloys 7075 and 2024.