Determination of the Activation Energy for Formation and Migration of Thermal Vacancies in 2024 Aircraft Material Using Different Techniques and Methods

Abstract:

Positron annihilation lifetime (PAL) , electrical and mechanical techniques have been used to study the thermal vacancies in one of the most important engineering aluminum alloys which is 2024 alloy. Quenching experiments were usually performed on thin specimens to ensure a uniform quenching rate throughout the specimen. The specimens were prepared with dimensions of 0.15 × 1.5 × 1.5cm³. After grinding, polishing and etching, samples of 2024 were homogenized for 12 h at 673 K and annealed for 90-min., before quenched in water (277 K) and then subject to positron lifetime, electrical and mechanical for measurements. From such measurements it is possible to deduce the vacancy formation enthalpy, which in combination with the results of self-diffusion measurements, give a value for migration enthalpy of the vacancy. These are very important quantities in the study of the annealing of irradiation induced defects.

• Periodical: Defect and Diffusion Forum (Volumes 337-338)
• Pages: 19-27
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.337-338.19
• Online since: April 2013
• Authors: N.A. Kamel
• Keywords: 2024 Alloy, Electrical Measurements, Positron Lifetime Technique, Vickers Hardness Number

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