Activation Enthalpy of Dislocation Migration in Aircraft (Aerospace) (2024) Alloy by Positron Spectroscopy

摘要

Positron annihilation lifetime is one of the most important nuclear techniques, used to study the isochronal and isothermal annealing in one 5f the most important engineering aluminum alloys which is 2024 alloy. Samples of 25 % deformation have been used for these studies. Two recovery stages during the isochronal annealing [1] were observed which were ascribed to the recovery of point defects and dislocations introduced by the deformation. The isothermal annealing measurements were performed at 58.3, 603, 623 and 643 K from which the activation energy obtained was 1.24 ± 0.08 eV.