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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 9/2015

01-09-2015

Effects of Germanium, Copper, and Silver Substitutions on Hardness and Microstructure in Lean Al-Mg-Si Alloys

Authors: Eva Anne Mørtsell, Calin D. Marioara, Sigmund J. Andersen, Jostein Røyset, Oddvin Reiso, Randi Holmestad

Published in: Metallurgical and Materials Transactions A | Issue 9/2015

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Abstract

It is shown that strength loss in a 6060 Al-Mg-Si alloy caused by reduction in solute can be compensated by adding back smaller quantities of Ag, Ge, and Cu. Nine alloys were investigated. Ge was found to be the most effective addition, strongly refining the precipitation. The hardness is discussed in terms of statistics of the precipitates near a T6 condition, as acquired by transmission electron microscopy (TEM). Precipitates in some conditions were also investigated by high-angle annular dark-field scanning TEM. The added elements have strong influence on the main hardening precipitate, β″, changing its structure and promoting disorder.
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Metadata
Title
Effects of Germanium, Copper, and Silver Substitutions on Hardness and Microstructure in Lean Al-Mg-Si Alloys
Authors
Eva Anne Mørtsell
Calin D. Marioara
Sigmund J. Andersen
Jostein Røyset
Oddvin Reiso
Randi Holmestad
Publication date
01-09-2015
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 9/2015
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-015-3039-5

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