Effect of various multi-stage solution treatments on the microstructure and properties of cold-extruded Al–9.74Zn–2.59 Mg–0.94Cu–0.2Zr–0.83Ti alloy

Herein, the microstructure and properties of cold-extruded Al–9.74Zn–2.59Mg–0.94Cu–0.2Zr–0.83Ti aluminum alloys after three different multi-stage solution treatments were investigated. Upon increasing the multi-stage solution treatment temperature and holding time, the grain size of the alloy gradua...

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Bibliographic Details
Published in:Journal of materials research 2022-11, Vol.37 (21), p.3731-3742
Main Authors: Zhou, Qingshan, Li, Chen, Wang, Tianlun, Xu, Xiaojing, Luo, Yuntian
Format: Article
Language:English
Subjects:
Aluminum base alloys
Applied and Technical Physics
Biomaterials
Chemical precipitation
Chemistry and Materials Science
Cold extrusion
Corrosion resistance
Elongation
Grain boundaries
Grain size
Guinier Preston zone
Inorganic Chemistry
Magnesium
Materials Engineering
Materials research
Materials Science
Microstructure
Nanotechnology
Precipitate free zone
Precipitates
Solution heat treatment
Tensile strength
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Summary:Herein, the microstructure and properties of cold-extruded Al–9.74Zn–2.59Mg–0.94Cu–0.2Zr–0.83Ti aluminum alloys after three different multi-stage solution treatments were investigated. Upon increasing the multi-stage solution treatment temperature and holding time, the grain size of the alloy gradually increase and the number of undissolved phases gradually decreased. After peak aging, many dislocations and sparse precipitates were observed in the three-stage solution treated alloy, and a high precipitate density was obtained in the alloys after multi-stage solution treatment, where the precipitates were mainly η' (metastable MgZn 2 ), η (stable MgZn 2 ) phase, and a (Guinier Preston zone) GP zone. The precipitate-free zone (PFZ) of the multi-stage solution treated alloys expanded, with semi-continuous grain boundary precipitates (GBPs) distributed at grain boundaries. Upon increasing the solution temperature and holding time, the hardness, tensile strength, and elongation of the alloy first increased and then decreased, and the corrosion resistance of the alloy gradually increased. Graphical abstract
ISSN:0884-2914
2044-5326
DOI:10.1557/s43578-022-00747-3