Residual Stress Evolution of 7050 Aluminum Alloy during Thermal Processing and Its Effects on Processing Deformation and Mechanical Properties

This paper investigated the evolution of residual stress of 7050 aluminum alloy during solid solution, uphill quenching and aging treatments through finite element simulation method (FEM) and experiments. The effects of residual stress on processing deformation and tensile properties were explored....

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Bibliographic Details
Published in:Journal of materials engineering and performance 2024-11, Vol.33 (21), p.11467-11483
Main Authors: Zhang, Mingli, Gu, Kaixuan, Weng, Zeju, Cui, Chen, Wang, Junjie
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Engineering Design
Materials Science
Original Research Article
Quality Control
Reliability
Safety and Risk
Tribology
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Summary:This paper investigated the evolution of residual stress of 7050 aluminum alloy during solid solution, uphill quenching and aging treatments through finite element simulation method (FEM) and experiments. The effects of residual stress on processing deformation and tensile properties were explored. The results showed that overall residual stress amplitude of the sample was increased with the decrease in cryogenic temperature, which was independent of the cooling rate. The combination of uphill quenching and aging treatment can release the quenching residual stress by 55%. The mechanism of uphill quenching was related to the temperature difference between the surface and core of the sample. With the increase in temperature difference, the direction of residual stress caused by heating was consistent with quenching residual stress, which resulted in stress superposition and consequently released the residual stress through plastic deformation. With the decrease in temperature difference, the direction was opposite to the quenching residual stress, and they interacted with each other to induce the release of residual stress. Original residual stress with low amplitude and uniform distribution after combined uphill quenching and aging treatment made contribution to improve the dimensional accuracy of aluminum alloy components after machining without no obvious deterioration in tensile strength.
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-023-08816-2