Aluminum profiles have high plasticity and low resistance at high temperatures. Combined with accelerated atomic diffusion and complete recrystallization, this helps improve the structure. Under a stress state dominated by triaxial compression, hot deformation can most effectively change the as-cast structure of aluminum profiles. With the right amount of deformation, the as-cast structure can undergo the following beneficial changes.
(1) Generally, hot deformation is carried out through repeated multi-pass deformation. Because hardening and softening occur simultaneously in each pass, industrial aluminum profile deformation breaks up coarse columnar grains. At the same time, some tiny cracks can also be healed.
(2) Due to the effect of hydrostatic pressure in the stress state, it promotes the welding of bubbles in the as-cast structure, compacts shrinkage cavities, and densifies loose areas, resulting in a denser structure.
(3) Because atomic thermal motion is stronger at high temperatures, under stress, with the help of atomic diffusion, it helps reduce chemical inhomogeneity in the casting.
Through hot deformation, the cast structure is improved into a deformed (or processed) structure, giving it higher density, uniform fine equiaxed grains, and more consistent chemical composition, thus significantly improving both plasticity and resistance.
