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Volume 13
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10.3390/ma13030554
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Article

Ageing Behaviour of Al–Mg–Si Alloys After Cryogenic and Room Temperature Deformation

by
Belinda Gruber
1,2,
Florian Grabner
3,
Werner Fragner
4,
Alexander Schökel
5,
Florian Spieckermann
6,
Peter J. Uggowitzer
1,7 and
Stefan Pogatscher
1,2,*
1
Chair of Nonferrous Metallurgy, Department Metallurgy, Montanuniversität Leoben, Franz-Josef-Straße 18, 8700 Leoben, Austria
2
Christian Doppler Laboratory for Advanced Aluminum Alloys, Chair of Nonferrous Metallurgy, Montanuniversität Leoben, Franz-Josef Straße 18, 8700 Leoben, Austria
3
LKR Light Metals Technologies Ranshofen, Austrian Institute of Technology, Lamprechtshausenerstr. 61, 5282 Ranshofen, Austria
4
AMAG rolling GmbH, Postfach 32, 5282 Ranshofen, Austria
5
Deutsches Elektronen Synchrotron (DESY), Notkestr. 85, 22607 Hamburg, Germany
6
Chair of Materials Physics, Department Materials Science, Montanuniversität Leoben, Jahnstr. 12, 8700 Leoben, Austria
7
Laboratory of Metal Physics and Technology, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 4, 8093 Zürich, Switzerland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(3), 554; https://doi.org/10.3390/ma13030554
Submission received: 12 December 2019 / Revised: 20 January 2020 / Accepted: 21 January 2020 / Published: 23 January 2020
(This article belongs to the Collection Alloy and Process Development of Light Metals)
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Abstract

The aim of this study is to investigate the effects of cryogenic and room temperature pre-deformation on subsequent artificial ageing of Al–Mg–Si alloys. Naturally aged and pre-aged samples were strained to 5%, 10% and 20% at RT (25 °C) and under liquid nitrogen, and artificially aged at 185 °C. Pre-deformation generally increases ageing kinetics for both the naturally aged and pre-aged alloys, which increase in proportion to the degree of pre-deformation, and which are slightly more pronounced for the cryogenic condition. The peak strength is constant, except for when a low degree of pre-deformation is used, in which case it is slightly reduced. Cryogenically deformed samples show an increased strength and hardness, compared to samples pre-deformed at RT, when subjected to an equal magnitude of strain. This difference is reduced during artificial ageing. Synchrotron measurements reveal that this behaviour can be linked to the greater dislocation density, which is not completely recovered even after prolonged ageing at 185 °C.
Keywords: aluminium alloys; cryogenic temperature; ageing kinetics; dislocation density; bake hardening aluminium alloys; cryogenic temperature; ageing kinetics; dislocation density; bake hardening
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MDPI and ACS Style

Gruber, B.; Grabner, F.; Fragner, W.; Schökel, A.; Spieckermann, F.; Uggowitzer, P.J.; Pogatscher, S. Ageing Behaviour of Al–Mg–Si Alloys After Cryogenic and Room Temperature Deformation. Materials 2020, 13, 554. https://doi.org/10.3390/ma13030554

AMA Style

Gruber B, Grabner F, Fragner W, Schökel A, Spieckermann F, Uggowitzer PJ, Pogatscher S. Ageing Behaviour of Al–Mg–Si Alloys After Cryogenic and Room Temperature Deformation. Materials. 2020; 13(3):554. https://doi.org/10.3390/ma13030554

Chicago/Turabian Style

Gruber, Belinda, Florian Grabner, Werner Fragner, Alexander Schökel, Florian Spieckermann, Peter J. Uggowitzer, and Stefan Pogatscher. 2020. "Ageing Behaviour of Al–Mg–Si Alloys After Cryogenic and Room Temperature Deformation" Materials 13, no. 3: 554. https://doi.org/10.3390/ma13030554

APA Style

Gruber, B., Grabner, F., Fragner, W., Schökel, A., Spieckermann, F., Uggowitzer, P. J., & Pogatscher, S. (2020). Ageing Behaviour of Al–Mg–Si Alloys After Cryogenic and Room Temperature Deformation. Materials, 13(3), 554. https://doi.org/10.3390/ma13030554

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