Paper Title:

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

Periodical Materials Science Forum (Volumes 519 - 521)
Main Theme Aluminium Alloys 2006 - ICAA10
Edited by W.J. Poole, M.A. Wells and D.J. Lloyd
Pages 597-602
DOI 10.4028/www.scientific.net/MSF.519-521.597
Citation Terence Kratzer et al., 2006, Materials Science Forum, 519-521, 597
Online since July 2006
Authors Terence Kratzer, Brian M. Gable, Kate M. Nairn, Timothy J. Bastow, Barry C. Muddle, Anita J. Hill
Keywords Al-Cu-Mg-Ag, Positron Annihilation, Silicon Additions, Vacancy Concentration
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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.