Monitoring the Effect of Recrystallization and Quenching in AlMgx Alloy by Pat

Authors : A ASHOUR

Pages : 453-458

View : 17 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Positron annihilation technique insert ignore into journalissuearticles values(PAT); lifetime measurements have been carried out on AlMgx samples insert ignore into journalissuearticles values(x = 0.23, 0.85, 1.27 and 1.4 at %); with point defects and dislocations introduced by plastic deformation at room temperature. Clustering of vacancies was observed by quenching using PAT. The samples were annealed at 573 K for 12 hours to homogenize and divided into two sets. The first set of AlMgx insert ignore into journalissuearticles values(x = 0.23, 0.85 and 1.4 at %); was deformed to 10, 25 and 35% thickness reduction. Isochronal annealing was studied in the range of 300-550 K. In the second set of measurements, AlMgx insert ignore into journalissuearticles values(x = 1.27 Mg at %); was deformed to 31.25% thickknes reduction. Variation in the mean lifetime with annealing time insert ignore into journalissuearticles values(Isothermal annealing at 323 K); was studied. On the other hand, the effect of the degree of deformation on change of the value of the mean lifetime with different concentration of Mg was studied. This work is able to distinguish the state of sample with different concentration of impurities. The deformed samples reach the bulk state at higher temperature. Grain growth occurred with increasing temperatures as shown by lifetime value. The effect of quenching from various temperatures range insert ignore into journalissuearticles values(373-823 K); was studied.
Keywords : Isothermal and Isochronal annealing, Deformation, Grain size, Quenching, Recrystallization