Combined effect of Sn addition and pre-ageing on natural secondary and artificial ageing of Al–Mg–Si alloys

Both Sn addition and pre-ageing are known to be effective in maintaining the artificial ageing potential after natural ageing of Al–Mg–Si alloys. In this study, the combined effects of Sn addition and pre-ageing at 100 °C or 180 °C on natural secondary ageing and subsequent artificial ageing of an a...

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Bibliographic Details
Published in:Journal of materials science 2022, Vol.57 (3), p.2149-2162
Main Authors: Zhang, Xingpu, Liu, Meng, Wang, Jiangwei, Li, Jixue, Banhart, John
Format: Article
Language:English
Subjects:
Aging (artificial)
Aging (natural)
Alloying additive
Alloys
Aluminum base alloys
Calorimetry
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Degassing of metals
Electric properties
Hardening
Hardness
Magnesium
Materials Science
Mechanical properties
Metals
Metals & Corrosion
Polymer Sciences
Silicon
Solid Mechanics
Specialty metals industry
Tin
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Summary:Both Sn addition and pre-ageing are known to be effective in maintaining the artificial ageing potential after natural ageing of Al–Mg–Si alloys. In this study, the combined effects of Sn addition and pre-ageing at 100 °C or 180 °C on natural secondary ageing and subsequent artificial ageing of an alloy AA6014 were investigated using hardness, electrical resistivity, differential scanning calorimetry and transmission electron microscopy characterizations. It is found that pre-ageing can suppress natural secondary ageing and improve the artificial ageing hardening kinetics and response after 1 week of natural secondary ageing in both alloys with and without Sn addition. The effect of pre-ageing at 100 °C is more pronounced in the Sn-free alloy while the combination of pre-ageing at 180 °C and adding Sn shows superiority in suppressing natural secondary ageing and thus avoiding the undesired hardening before artificial ageing. Moreover, when natural ageing steps up to 8 h are applied before pre-ageing at 100 °C, the effect of pre-ageing in Sn-added alloy can be further improved. The influence of Sn on vacancies at different ageing temperatures is discussed to explain the observed phenomena. Graphical abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-021-06654-y