Materials, Vol. 18, Pages 4903: Investigation on Hot Deformation Behavior and Microstructural Evolution of Al-Mg-Zn Aluminum Alloy via Uniaxial Isothermal Hot Compression Tests

Materials doi: 10.3390/ma18214903

Authors:
Fei He
Junzhe Huang
Kai Zhu
Xiwu Li
Kai Wen
Guanjun Gao
Lizhen Yan
Hongwei Yan
Zhihui Li
Yongan Zhang
Baiqing Xiong

In this study, we investigated the hot deformation behavior and microstructural evolution of a novel high-magnesium-content (high-Mg) aluminum alloy, bridging the disciplines of material processing and physical metallurgy. Uniaxial hot compression tests were performed over the temperature range of 280~400 °C and strain rates of 0.001~10 s−1 to investigate its hot deformation behavior. The flow stress curves were systematically analyzed, and a constitutive model was developed to describe the thermo-mechanical response of the alloy. Microstructural evolution was characterized using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The results indicate that dynamic recovery serves as the dominant softening mechanism at lower deformation temperatures (≤320 °C). As the temperature increased to 400 °C, a significant rise in dynamic recrystallization was observed. Moreover, at 400 °C, higher strain rates led to the formation of abundant, network-like, mushroom-shaped dynamically recrystallized grains.

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Fei He www.mdpi.com