High Temperature Deformation Behavior of Alu 5083
Alu 5083 belongs to the Al-Mg non-heat-treatable deformed aluminum alloy, featuring medium strength, good formability, welding performance, and corrosion resistance. It is widely used in transportation such as automobile, ships, aerospace and tank truck.
The flow stress of an alloy during hot deformation is one of the most basic index that characterize the plasticity of 5083 aluminum alloy, which determines the load that needs to be applied and the energy consumed during processing.
When metal is hot processed, the dislocation density in the alloy increases sharply, and the probability of dislocation movement encountering grain boundaries, impurities and second-phase particles will greatly increase, causing the alloy to produce dislocation plugging, resulting in work hardening and the increase of flow.
The flow stress of the metal rapidly increases to the peak value in the initial stage of thermal processing. After that, it enters the stable deformation stage, and the flow stress remains basically unchanged.
At this time, the proliferation of dislocations generated during alloy deformation and the disappearance of dislocations caused by cross-slip and climbing of dislocations reach a dynamic equilibrium.
When the deformation temperature is 300~500 ℃ and the strain rate is 0.01~0.1 s−1, the alloy exhibits the above characteristics. When the deformation temperature is 350 ℃ and the strain rate is 0.1 s−1, the grain orientation and grain boundary diagram of the alloy is dominated by small-angle grain boundaries.
The peak stress of 5083 aluminum alloy during high temperature deformation decreases with the increase of deformation temperature, and increases with the increase of strain rate. The alloy recovers dynamically under the deformation temperature of 300~500 ℃ and the strain rate of 0.01~0.1 s−1.
Dynamic recrystallization of 5083 plate occurs under the deformation conditions of a deformation temperature of 400 to 500 ℃, a strain rate of 1 s−1, and a deformation temperature of 300 to 500 ℃ and a strain rate of 10 s−1.
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