GRAIN SIZE IN CASTING AND WROUGHTAl-ALLOYS BY POSITRON LIFETIME TECHNIQUE

M. A. Abdel-Rahman, R. M. Abdel-Latif, M. S. Abdallah and Emad A. Badawi ()
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M. A. Abdel-Rahman: Faculty of Science, Physics Department, El-Minia University, Egypt
R. M. Abdel-Latif: Faculty of Science, Physics Department, El-Minia University, Egypt
M. S. Abdallah: Faculty of Science, Physics Department, El-Minia University, Egypt
Emad A. Badawi: Faculty of Science, Physics Department, El-Minia University, Egypt

Surface Review and Letters (SRL), 2005, vol. 12, issue 02, 197-202

Abstract: Positron behavior at grain boundaries is characterized by their bulk diffusibility D, their bulk free lifetimeτfand their trapped lifetimeτt(τt> τf).AlSi11.35Mg0.23,AlSi10.9Mg0.17Sr0.06, 7075 and 2024 alloys have been homogenized at 673 K for 12 hours. The mean lifetime, as (indirectly) measured at various strains (degrees of deformation), show a good fitting with a FORTRAN program.τfandτtfor the above materials are shown as:(187.3 ± 0.10, 229.7 ± 0.10),(198.0 ± 0.10, 230.3 ± 0.10),(205.4 ± 0.05, 213.4 ± 0.06)and(197.1 ± 0.55, 215.2 ± 0.57)Ps respectively. The mean lifetime was found to vary exponentially with the degree of deformation.

Keywords: Casting and wrought alloys; PLT and grain size (search for similar items in EconPapers)
Date: 2005
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DOI: 10.1142/S0218625X05006925

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