The aluminum profile has high plasticity and low resistance at high temperature, and the atomic diffusion process is intensified, accompanied by complete recrystallization, which is conducive to the improvement of the structure. Under the predominance of the three-dimensional compressive stress state, thermal deformation can most effectively change the as-cast structure of the aluminum profile. Given an appropriate amount of deformation, the following beneficial changes can occur in the as-cast structure.
- Generally, thermal deformation is accomplished by repeated deformation in multiple passes. Because the hardening and softening processes occur simultaneously in each pass. The industrial aluminum profile deformed and shattered the coarse columnar grains. At the same time, some tiny cracks can be healed.
- Due to the effect of hydrostatic pressure in the stress state, it can promote the bubble welding existing in the as-cast structure, shrinkage cavities compaction, looseness and compaction, and become a denser structure.
- As the thermal motion ability of high-temperature atoms is strengthened, under the action of stress, the free diffusion and heterodiffusion of atoms help to relatively reduce the inhomogeneity of the chemical composition of the ingot.
Through thermal deformation, the ingot structure improves the deformed structure (or processing structure), so that it has a higher density, uniform and fine equiaxed grains and a relatively uniform chemical composition, so the plasticity and resistance indicators are significantly improved
Link to this article：The effect of high temperature environment on the performance of aluminum profiles
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