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Journal of Materials Science
Published in: Journal of Materials Science 16/2016

19-05-2016 | Original Paper

Positron lifetime study of the formation of vacancy clusters and dislocations in quenched Al, Al–Mg and Al–Si alloys

Authors: Meng Liu, Benedikt Klobes, John Banhart

Published in: Journal of Materials Science | Issue 16/2016

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Abstract

The clustering kinetics in quenched pure Al, binary Al–Mg and binary Al–Si alloys were studied by positron annihilation lifetime spectroscopy (PALS) and differential scanning calorimetry (DSC) during natural ageing (NA). Shortly after quenching, positrons annihilate either in the bulk material or in vacancy-type defects such as mono-vacancies (in Al) and vacancy–solute complexes (in Al–Mg and Al–Si alloys). Upon NA, vacancy clusters of various sizes and number densities are formed. In Al, such clusters contain typically 3 vacancies. In Al–Mg and Al–Si alloys, complexes containing various vacancies and also solute atoms are formed. The presence of shallow positron traps was detected in temperature-dependent positron lifetime experiments. They were identified as quenched-in dislocations rather than Mg or Si clusters as no solute clustering signal during NA was observed in DSC runs of the binary Al–Mg and Al–Si alloys.
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Footnotes
1
Note that positron affinities are usually calculated for extended bulk materials (or with respect to the interface of two bulk materials). Thus, positron affinities calculated in this way do not necessarily correspond to positron affinities of single atoms inside a host matrix.
 
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Metadata
Title
Positron lifetime study of the formation of vacancy clusters and dislocations in quenched Al, Al–Mg and Al–Si alloys
Authors
Meng Liu
Benedikt Klobes
John Banhart
Publication date
19-05-2016
Publisher
Springer US
Published in
Journal of Materials Science / Issue 16/2016
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-016-0057-7

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