Effect Of Stabilizing Annealing Temperature And Processing On Microstructure And Properties Of5383Aluminum Alloy

In this paper, this article is divided into three parts for the effects of different process parameters on the5383aluminum alloy microstructure, mechanical properties and corrosion. Hot rolling temperature, cold rolling reduction and stabilizing annealing temperature of5383aluminum alloy are studied by means of the isothermal compression simulation test, DSC analysis, high temperature tensile test, microhardness test, electrochemical test, OM, SEM, TEM. The experimental results show:l.In the high temperature tensile test, the tensile strength decreases with the increase of the thermal deformation temperature, and the elongation increases first and then decreases. The thermoplastic can be the best when the heat distortion temperature is400℃to480℃. When the hot rolling temperature is470℃, its corrosion achieves the best.2.The recrystallization temperature of5383aluminum alloy is280℃With the increases of annealing temperature, the strength of the alloy decreases, but the elongation increases. When5383aluminum alloy is annealed at150℃for1h, β phase become continuous distribution at the grain boundaries, which will reduce the corrosion resistance of alloy.when the alloy is annealed at300℃for1h, recrystallization happens, β phase and τ phase are evenly distributed, so the corrosion rises. When the alloy is annealed at350℃for1h, the recrystallized grains and (3phase become larger, its corrosion decreases again.3.When the5383aluminum alloy is annealed at200℃for1h, the strength of the alloy increases with the increase of the amount of cold deformation, but the elongation decreases. The alloy remains along the rolling direction of the fibrous. Besides, different number and distribution of (3phase and τ phase appear in the organization. With the increase of the amount of deformation, the dislocation density within the organization is gradually increased, and the diffusion of Mg becomes easy, the number of τ-phase precipitation decreases, so the (3phase segregation tendency is also gradually increased, the corrosion of the alloy gets worse again. 4.In3.5%NaCl solution, the corrosion potential of β phase, τ phase, alpha (Al) is-.085V,-0.813V,-0.802V. Durning this process active dissolution and pitting occurs in β phase,τ phase, but only active dissolution is found in alpha (Al). Besides, in the analog alloy corrosion experiment, anodic dissolution phenomenon happens in τ phase, but its dissolution rate is significantly lower than the β phase, which means τ phase gets more resistant to corrosion compared to β phase.