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HomeMaterials Science ForumMaterials Science Forum Vols. 794-796Ageing Characteristics of Al-Mg-(Ge,Si)-Cu Alloys

Ageing Characteristics of Al-Mg-(Ge,Si)-Cu Alloys

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Abstract:

In order to elucidate some of the differences between Al-Mg-Si and Al-Mg-Ge alloys and the role of Cu, a series of Al-Mg-Ge, Al-Mg-Si and Al-Mg-Ge-Si alloys, some of them containing Cu, are investigated by positron annihilation lifetime spectroscopy during natural ageing. Al-Mg-Ge alloys show qualitatively the same evolution of positron lifetime τ_1C with time as Al-Mg-Si alloys, namely an initial decrease, followed by a re-increase, after which τ_1C drops to an equilibrium value. However, for alloys with equal Mg contents, Ge gives rise to a notably slower ageing kinetics than Si, pointing at effects of atomic size or solute-vacancy binding energies. Adding Cu to both Al-Mg-Ge and Al-Mg-Si alloys slows down the initial formation of clusters but promotes their further growth.

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Periodical:

Materials Science Forum (Volumes 794-796)

Pages:

971-976

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.794-796.971

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Online since:

June 2014

Authors:

Meng Liu*, Calin Daniel Marioara, Randi Holmestad, John Banhart

Keywords:

Aging, Al-Mg-(Ge,Si)-Cu, Positron Annihilation, Solute cluster, Vacancy

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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