Dislocation Recovery in Casting Alloy by Positron Lifetime Technique

M.A. Abdel-Rahman; M.S. Abdallah; N.A. Kamel; Emad A. Badawi

doi:10.4028/www.scientific.net/DDF.280-281.113

Paper Titles

Diffusion Formation of Silicide Phases in Ni/Si(001) Nanodimensional Film System
p.9

Investigations of the EPR Parameters and Local Structure for one Cu²⁺ Center in CdS
p.15

Slow Positron Annihilation in Ion-Implanted Silicon
p.21

Semi-Empirical Parameterization of Interatomic Interactions and Kinetics of the Atomic Ordering in Ni-Fe-C Permalloys and Elinvars
p.29

Formation of Point Defects in Dilute FCC Alloys
p.79

Mechanical Testing of Diffusion Bonded Metallic Hollow Sphere Structure (MHSS)
p.85

Towards a Correlation between High-Temperature Creep and Volume Diffusion for Equiatomic NiTi Alloys
p.97

Structural Characterisation of Diffusion-Bonded Hollow Sphere Structures
p.105

Dislocation Recovery in Casting Alloy by Positron Lifetime Technique
p.113

HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 280-281Dislocation Recovery in Casting Alloy by Positron...

Dislocation Recovery in Casting Alloy by Positron Lifetime Technique

Abstract:

Recovery behavior of 20% plastically deformation of casting AlSi11.35Mg0.23 in various stages of isochronal annealing has been investigated by positron Lifetime (LT). The experimental results show that the positron mean lifetime is a function of annealing temperature. Lifetime of the positron annihilating in perfect lattice is 187.3ps and in 20% deformed is 229.8 ps. There are two regions in the isochronal annealing, one of them relating to the point defect and the other to the dislocation. The activation enthalpy for the dislocation is calculated from the isothermal study in the dislocation region from (575-675) K by slow and fast cooling as 0.16±0.02 and 0.53±0.06 eV respectively.