الفهرس 
Defects in Crystalline Solid MaterialsOnly 14 pages are availabe for public view
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Abstract
Physics Department, Faculty of Education, Ain
Shams University.
The present work is devoted to investigate:
(1) The effect of grain diameter and deformation temperature on the stress-strain characteristics of Al-5356 wire samples under constant strain rate (S.R) of 1.5x10-3 s-1.
(2) The effect of ageing time on the stress-strain characteristics of Al-5356 wire samples strained at different deformation temperatures ranging from 303 to 523 K under constant strain rate of 1.5x10-3 s-1.
(3) The effect of γ-irradiation with different doses (D) ranging from 500 to 2000 kGy on the stress-strain characteristics of Al-5356 samples strained by strain rate of 1.5x10-3 s-1at different deformation temperatures (Tw).
(4) The structural changes accompanying both grain growth and ageing processes using optical and scanning electron microscopy (SEM) in addition to the energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) investigations.
In view of the microstructure and subsequently the stress-strain parameters variation, the obtained results showed that:
a) Increasing grain diameter of the tested sample resulted in decreasing the work-hardening parameters (WHP) yield stress σy, fracture stress σf, total strain εT and work-hardening coefficient χp.
b) Serration amplitude was found to be inversely proportional to the increase in grain diameter.
c) The total strain εT decreased with increasing the grain diameter while increasing the deformation temperature exhibited minimum value at 348K.
d) The WHPs σy, σf and χp increased with increasing the ageing time, while εT decreased.
e) The WHPs σy, σf and χp increased with increasing the irradiation dose D, while εT decreased.
f) The Deformation temperature exhibited a reverse effect of γ-irradiation.