Abstract
The stress strain state, as well as the process of formation of structure and features of aluminium alloys at hot extrusion are investigated. It has been shown that during hot extrusion, the ring layers of an extruded element experience not only longitudinal and transverse deformations but also a slip. The slip increases at passing from inner layers to the surface. The tensile principal stresses and the sum of slip deformations also increase. It has been also shown that at the exit of the pressing part, the tensile principal stresses have different directions, forming an angle with the extruder axis, which also increases towards the surface. As a conclusion, it has been stated that the main radial and circumferential deformations act as restraining deformations.
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