New method of calculating the equal channel angular extrusion (ECAE) pressure is introduced. Calculation of the pressure is produced by using friction factor of Siebel. This method of pressure calculation is proposed for ECAE of shaft billets and for the equal-channel angular hydroextrusion.
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Deformation processes of Cu-Al2OS composite materials prepared via powder metallurgy are assessed in the paper. Powder mixture was prepared by grinding of Cu and Al2O3 particles. After the compaction, materials were deformed by extrusion, forging and isostatic pressing. Qualitatively were evaluated their microstructural characteristics and quantitatively their mechanical properties. By comparison of mentioned three deformation technologies it was found the isotropic microstructure in materials deformed by forging and isostatic pressing. Optimum properties (ultimate tensile strength and reduction of area) showed the materials deformed by hot isostatic pressing, which possessed low residual porosity ( <1 vol. %).
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