Estudo das propriedades mecânicas e tribológicas da liga de alumínio AlMgZnSiCu produzida por conformação por spray e reprocessada por forjamento rotativo

Abstract

Aluminum alloys used in high-responsibility components, have high mechanical strength, low melting point and low density, making their application very attractive in various sectors of the aeronautics and automobile industries. Aluminum alloys produced by spray forming (CS) are normally reprocessed by mechanical forming, with the aim of reducing the porosities resulting from this process. The microstructure obtained by this process for this alloy was more refined due to the high solidification rates obtained by the spray forming process, when compared to conventional processes. The use of the rotary forging process is an alternative route used, aiming at reducing porosity. The AlMgZnSiCu aluminum alloy used in this work was produced by spray forming and reprocessed by rotary forging and thermally treated by solubilization and precipitation hardening, aiming at increasing the mechanical and tribological properties, being objects of study in this work that investigated the properties of the material. . The hardness was measured using the nanoindenter and its tribological properties using the nanotribometer. Evidence of the presence of second phases such as: Mg2Si, MgZn2 and Al7Cu2Fe and the distribution of elements in the metallic matrix were also found. The obtained results showed a gain in the mechanical properties, after the heat treatments (T6) carried out on the obtained alloy, as is the case of hardness and also the tribological variations found before and after the heat treatments, as is the case of the coefficient of friction and the wear.