Abstract
Hot compression tests over the temperature range from 350 °C to 500 °C and strain rates range from 0.001 s−1 to 1 s−1 for homogenized Al–6.32Zn–2.10Mg alloy were carried out on a Gleeble-3800 thermal simulation machine to characterize its hot deformation behavior. At the same time, a modified Arrhenius constitutive equation was established to describe the flow behavior of the alloy, whose average absolute error is 2.89%, which proved to have an excellent predictive effect on the flow stress of the alloy. The hot processing map of the alloy was established, and the stability processing parameters were 460–500 °C and 0.01–0.08 s−1. Then, the Z parameter processing map and activation energy processing (AEP) maps were established for further optimization. Eventually, the optimal processing parameters of the alloy was 460–500 °C (0.03–0.08 s−1). Then, the microstructure of specimens was observed using electron backscatter diffraction. Based on the findings the reasonability of the AEP map and Z parameter map was verified. Finally, electron backscatter diffraction (EBSD) techniques were used to analyze the evolution of the grain structure during the deformation process. It was found that dynamic recovery (DRV) was the main softening mechanism of Al–6.32Zn–2.10Mg. Continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) operated together with the increase of strain, but CDRX was confirmed as the dominant DRX mechanism.
Highlights
Al–Zn–Mg alloys play an integral role in the aerospace industry and other defense industries as one of the main structural materials owing to their high strength and good toughness
It is essential to reveal the relationship between the flow behavior and microstructure evolution of hot deformation, to study the true stress–strain curves of the alloy, and to establish the high temperature rheological constitutive model and hot processing map, which is of great significance to optimize the alloy production process and improve the product performance and quality
In research on the metal flow behavior, the high temperature rheological constitutive model is used to predict the true stress of alloys under different deformation parameters and is the key to research into its hot deformation behavior and carrying out the numerical simulation
Summary
Al–Zn–Mg alloys play an integral role in the aerospace industry and other defense industries as one of the main structural materials owing to their high strength and good toughness. It is essential to reveal the relationship between the flow behavior and microstructure evolution of hot deformation, to study the true stress–strain curves of the alloy, and to establish the high temperature rheological constitutive model and hot processing map, which is of great significance to optimize the alloy production process and improve the product performance and quality. Lin et al [19] established the hot-processing map of Al–5.8Zn–2.3Mg by superimposing the power dissipation coefficient diagram and the instability diagram, and studied the relationship between microstructure evolution and hot working This was not through the coupling of the hot processing map and AEP map to optimal processing parameter, and failed to explore more details about the evolution of the grain structure during the hot deformation. Metals 2021, 11, 360 which supplied a theoretical basis for optimizing the hot working processes of the of alloy and improving the performance and quality of the hot-processed products
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