Vacancy–solute interactions during multiple-step ageing of an Al–Cu–Mg–Ag alloy

Small additions of Ag and Mg stimulate nucleation of the Ω phase in artificially aged Al–Cu alloys, after which these elements segregate to the Ω/matrix interfaces. In this work, positron spectroscopy results show that vacancies accompany the Ag (and Mg) atoms at the interface during precipitate for...

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Bibliographic Details
Published in:Scripta materialia 2009-02, Vol.60 (3), p.137-140
Main Authors: Ferragut, R., Dupasquier, A., Macchi, C.E., Somoza, A., Lumley, R.N., Polmear, I.J.
Format: Article
Language:English
Subjects:
Aging
Alloying elements
Aluminium alloys
Aluminum base alloys
Hardness
Magnesium
Nucleation
Phase transformation kinetics
Positron annihilation
Precipitates
Precipitation
Silver
Vacancy–solute complexes
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Summary:Small additions of Ag and Mg stimulate nucleation of the Ω phase in artificially aged Al–Cu alloys, after which these elements segregate to the Ω/matrix interfaces. In this work, positron spectroscopy results show that vacancies accompany the Ag (and Mg) atoms at the interface during precipitate formation, after which they are released back into the matrix and facilitate secondary ageing at ambient temperature.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2008.09.011