Hot deformation behavior and dynamic softening mechanism for extreme-cooled 7055 aluminum alloy

An isothermal compression test of extreme-cooled 7055 aluminum alloy was performed on a thermomechanical simulator under the temperature of 250–450 °C and the strain rate of 0.001−1 s −1 . The constitutive model and microstructure evolution of 7055 aluminum alloy during hot compression deformation w...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2022-03, Vol.128 (3), Article 195
Main Authors: Li, Guisheng, Rui, Wenliang, Xu, Gaoshan, Zhang, Mingya, Li, Jinghui
Format: Article
Language:English
Subjects:
Aluminum alloys
Aluminum base alloys
Applied physics
Characterization and Evaluation of Materials
Compression tests
Condensed Matter Physics
Constitutive models
Deformation
Dynamic recrystallization
Electron backscatter diffraction
Hot pressing
Machines
Manufacturing
Materials science
Mathematical models
Microstructure
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Softening
Strain rate
Surfaces and Interfaces
Thin Films
Yield strength
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Summary:An isothermal compression test of extreme-cooled 7055 aluminum alloy was performed on a thermomechanical simulator under the temperature of 250–450 °C and the strain rate of 0.001−1 s −1 . The constitutive model and microstructure evolution of 7055 aluminum alloy during hot compression deformation were studied. We modify the Arrhenius (AR) model considering strain compensation, which can predict the flow stress accurately. The microstructure and dynamic softening mechanism under different deformation conditions were studied using electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM). The softening mechanism has gradually changed from dynamic recovery (DRV) to dynamic recrystallization (DRX) with increasing the temperature. With the increase of the strain rate, the softening mechanism has also changed from DRX to DRV. The main dynamic softening mechanism of extreme-cooled 7055 aluminum alloy is DRV and DRX. Finally, it is described that the DRX behavior is dominated by continuous dynamic recrystallization (CDRX). Simultaneously, partial discontinuous dynamic recrystallization (DDRX) exists at lower temperature.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-022-05345-y