The impact of high temperatures on the performance of aluminum profiles

Aluminum profiles have high plasticity and low resistance at high temperatures. Coupled with accelerated atomic diffusion and complete recrystallization, this helps improve the structure. When three-directional compressive stress dominates, hot deformation can most effectively change the as-cast structure of aluminum profiles. Applying the right amount of deformation can lead to the following beneficial changes in the as-cast structure.

(1) General hot deformation is achieved through multiple passes of repeated deformation. Since hardening and softening happen simultaneously in each pass, industrial aluminum profiles undergo deformation that breaks up coarse columnar grains. At the same time, it can also help heal some tiny cracks.

(2) Due to the hydrostatic pressure in the stress state, it can help weld bubbles present in the cast structure, fill shrinkage cavities, densify porous areas, and turn them into a denser structure.

(3) With the increased atomic thermal motion at high temperatures, under stress, the free diffusion and interdiffusion of atoms can help relatively reduce the unevenness in the chemical composition of the cast ingot.

Through hot deformation, the ingot structure is improved into a deformed (or processed) structure, giving it higher density, uniform fine equiaxed grains, and relatively uniform chemical composition, which clearly enhances its plasticity and strength.