Open Access Conference Proceedings

The aluminum alloys with 1 % Fe, 0.3 % Zr, 0.25 % Si and with 1 % Fe, 0.3 % Zr, 1 % Si (in wt.%), were investigated after hot rolling to a strain of 70% at 300 °C followed by annealing at 400-500 °C during 1 and 3 h. The hot rolling resulted in the elongation of initial grains along the rolling direction. The lamellar microstructure with the transverse size of structural elements of about 0.7-0.8 μm evolved during deformation. The hot rolling was accompanied by strengthening of the both alloys and an increase of the electrical conductivity in the Al -1 % Fe, 0.3 % Zr, 1 % Si alloy. The yield strength after annealing at 400 °C was 160 MPa and 165 MPa for the Al with 1 % Fe, 0.3 % Zr, 0.25 % Si and Al with 1 % Fe, 0.3 % Zr, 1 % Si alloys, respectively. The fine structure after annealing contained dispersed particles with a size of about 4-5 nm, which were identified as Al3Zr with L12 structure. An increase in the electrical conductivity to 53% IACS confirmed decomposition of solid solution during annealing in the Al - 1 % Fe, 0.3 % Zr, 0.25 % Si and Al - 1 % Fe, 0.3 % Zr, 1 % Si alloys. The strengthening was discussed in terms of the modified Hall-Petch relationship.

Keywords: Al-Fe-Si-Zr alloys, strengthening, electrical conductivity, Al3Zr particles, Hall-Petch relationship

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