Ultrafine grain formation during equal channel angular extrusion in an Al-Mg-Si alloy

Purpose: The possibility of including a new methods into classical technologies is one of reasons which for writing this paper. Design/methodology/approach: Microstructural development of aluminium alloy 6082 during equal-channel angular pressing (ECAP). Analysis of structure was made by light microscopy and SEM analysis. Findings: This procedure makes it possible to obtain after 4 passes the grain size of approx. 1 μm. In order to obtain an optimum micro-structure it is necessary to apply more passes with turning of the sample between individual passes by 90° about the longitudinal axis. Research limitations/implications: In this process (ECAP) was one of head problems a impossibility of application other shapes material. One of eventuality solving in respect thereof is using DECAP process. Practical implications: Radii of rounding of working edges of extruding channel must correspond to conditions for laminar flow of metal. Originality/value: Aluminium alloy 6082 was used to ECAP process, and found to be that this material can to change substructure structure, mechanical properties, respectively. Achieved quality level of mechanical properties is a function of number of passes as well as used technological route.