Probing the Activation Migration Enthalpies of Dislocations in 2024 Aircraft Material Using Nuclear and Electrical Techniques

Abstract:

Positron annihilation lifetime (PAL) measurement is one of the most important nuclear techniques used in materials science. Electrical measurements are also used in materials science. Both PAL and electrical measurements were used here to determine the activation energy of migration of dislocations in one of the most important engineering aluminum alloys: 2024. Samples of 25% deformed (thickness reduction) material have been used for these studies. The isothermal annealing measurements were performed at 583, 603, 623 and 643K for both techniques. The activation energy of migration of the dislocation was found to be equal to 1.24 ± 0.08eV by using PAL measurements and to 1.35 ± 0.01eV by using the electrical technique.

• Periodical: Defect and Diffusion Forum (Volumes 316-317)
• Pages: 119-126
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.316-317.119
• Online since: May 2011
• Authors: M.A. Abdel-Rahman, N.A. Kamel, Abdullah A. Refeay, Emad A. Badawi
• Keywords: 2024 Alloy, Activation Energy, Electrical Measurement, Isothermal Annealing, Positron Lifetime Technique

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