Abstract
The dynamic recrystallization behaviors of 6082 aluminum alloy in the temperature range of 623–773 K and strain rate range of 0.01–5 s−1 were studied by electron back scattered diffraction (EBSD) and transmission electron microscopy (TEM). According to the experimental results, dynamic recrystallization occurs during hot deformation of 6082 aluminum alloy, although the true stress-strain curve has no obvious single peak characteristic, and the degree of dynamic recrystallization is closely related to the Z parameter. Hot compression with lnZ = 24.9014 (723 K, 0.1 s−1) gives rise to the highest recrystallization fraction of 38.6%. The initial critical strain of dynamic recrystallization was determined by the work hardening rate. The quantitative relationship between the critical strain and Z parameters was established: [Formula: see text]. Based on the EBSD analysis and measurement results, dynamic recrystallization kinetics models of 6082 aluminum alloy during hot deformation were deduced. Microstructure analysis showed that the subgrain structure formed in the original grain is coarsened by grain boundary migration, and the orientation difference increases continuously until a large-angle grain boundary forms, resulting in dynamic recrystallization of grains. The likely mechanism is continuous dynamic recrystallization.
Highlights
The Al–Mg–Si series of wrought aluminum alloys has excellent comprehensive properties, including excellent specific strength, machinability, and corrosion resistance, and are widely applied in various fields, including the aerospace and automobile industries
By utilizing electron back scattered diffraction (EBSD) and transmission electron microscopy (TEM), deformed microstructures were observed at the central longitudinal section of the compressed samples
With the increase in temperature or the reduction in strain rate, the flow stress of 6082 aluminum alloy gradually decreased until the Al alloy entered the steady-state flow stage
Summary
The Al–Mg–Si (aluminum–magnesium–silicon) series of wrought aluminum alloys has excellent comprehensive properties, including excellent specific strength, machinability, and corrosion resistance, and are widely applied in various fields, including the aerospace and automobile industries. Poletti et al.[8] described the strain hardening, dynamic recovery, and static recrystallization of 6082 aluminum alloy during thermal deformation by utilizing a dislocation density model They explained the evolution law of grain size after recrystallization of the alloy. By performing thermal simulation tests under isothermal conditions, transmission electron microscopy (TEM) and EBSD were used to explore the evolution laws of the mechanical properties and microstructures of 6082 aluminum alloy under different thermal deformation conditions. On this basis, a model for the dynamic recrystallization of the alloy was established to further discuss the dynamic recrystallization mechanism of the Al alloy. This study is expected to provide experimental data and a theoretical basis for scientifically designing hot forming technologies for 6082 aluminum alloys
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