Paper Title:
The Effect of Alloying Additions on Vacancy Behaviour in Aluminium-Copper Alloys

The effect of Si additions on vacancy behavior following solution treatment and quenching was studied for an Al-Cu-Mg-Ag alloy system using positron annihilation lifetime spectroscopy (PALS). Both the initial positron lifetime and steady state positron lifetime increase as the Si concentration increases. This behavior is interpreted in terms of Si interacting with vacancies, leading to their retention in the alloy. The ability of PALS to monitor vacancy behavior after solution treatment should allow the improved prediction of phase transformation kinetics and hence the tailoring of ageing treatments.

Materials Science Forum (Volumes 519-521)
Edited by
W.J. Poole, M.A. Wells and D.J. Lloyd
T. Kratzer, B. M. Gable, K. M. Nairn, T. J. Bastow, B. C. Muddle, A. J. Hill, "The Effect of Alloying Additions on Vacancy Behaviour in Aluminium-Copper Alloys", Materials Science Forum, Vols 519-521, pp. 597-602, Jul. 2006
Online since
July 2006
US$ 28,-
Authors: M.A. Abdel-Rahman, M. Abdel-Rahman, N.A. Kamel, M.S. Abdallah, Emad A. Badawi
Abstract:Positron annihilation has been performed in order to study the isochronal annealing of wrought (2024, 7075) and cast (AlSi11.35Mg0.23,...
  | Authors: David Merida, Jose Angel García, Estibalitz Apiñaniz, Fernando Plazaola, Vicente Sánchez-Alarcos, José Ignacio Pérez-Landazábal, Vicente Recarte
Abstract:We have studied by means of positron lifetime measurements the role that vacancy type defects play in the martensitic transformation in...
Authors: Ewa Dryzek, Jacek Jaworski, Eric Fleury, Andrzej Budziak
Abstract:Positron annihilation lifetime spectroscopy (PALS) has been applied to study if the microstructure changes in Co80Zr10V10 and Co65Zr10V25...