The Manufacturing Process of Aluminium 5083 H321

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The 5083 aluminum alloy sheet has many advantages such as light weight, medium strength, and easy forming. It can be used in the manufacture of automobile parts, ships and truck tank. However, 5083 aluminum alloy has a relatively high Mg content. It is easy to precipitate β phase (Mg2Al3) at the grain boundary when placed at room temperature for a long time. The precipitation of β phase will make the material age soften.

5083 aluminum alloy .jpg

In order to reduce the adverse effects of β phase precipitation, aluminum 5083 h321 was developed. Stabilizing annealing is carried out on the cold-deformed 5083 aluminum alloy sheet, so that part of Mg can be uniformly precipitated in the alloy in the form of β phase, ensuring that the material after aging softening still meets the performance requirements.

In the manufacturing process of 5083 h321 sheet, the amount of cold deformation after recrystallization annealing, and the temperature and time of stabilization annealing after cold deformation are three key process parameters that affect the final properties of the 5083 aluminum plate.

During the cold deformation process, as the amount of cold deformation increases, the plate lattice distortion and the degree of grain breakage will increase, and the large grains will be elongated along the rolling direction to form a fiber or band-like structure, and a large number of bits will be generated inside the grains. The interaction between dislocations is enhanced, therefore, the strength of the alloy increases.

With the increase of the annealing temperature and the extension of the holding time of the stabilized annealing, the tensile strength and the yield strength will decrease. This is due to the large deformation storage energy accumulated after the cold working of the plate, which causes recovery and softening during annealing. Partial work hardening is eliminated, so the strength is reduced and the elongation is increased.

As the amount of deformation increases, the intergranular corrosion resistance of 5083-H321 sheet decreases, and when the amount of deformation and the stabilization annealing time are the same, the intergranular corrosion resistance of the plate depends on the temperature of the stabilization annealing.A cold deformation of 20% and a stabilized annealing system of 180℃/2h are the best production processes for the 3 mm 5083 aluminum sheet.

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