Caracterização microestrutural e mecânica da liga AlMgZnSiCu produzida por conformação por spray

Abstract

Aluminum is the non-ferrous metal most widely used in the world, whose applications range from the household appliance sector to more competitive sectors, such as automotive and aeronautics. Aluminum alloys can be classified by their production method and their ability to form intermetallic precipitates through heat treatment. Among the most used heat treatments, solubilization with the addition of aging stands out, show consistency in forming second phase particles, producing an increase in the hardness and resistance depending on how they interfere in the metallic matrix. These increasing mechanical properties are correlated with the second phase particles working as obstacles to the dislocation movements. Recent research indicates that AlMgZnSiCu alloys produced by spray forming, can achieve high mechanical properties after extrusion and treatment. Thus, the objective of this work was to characterize the microstructure and mechanical property of the AlMgZnSiCu alloy obtained by spray forming, regarding to contribute to the study of the processing route using extrusion and heat treatments. For this, the reduction of grain size was analyzed, as well as the presence of precipitates and increased hardness after hot extrusion and heat treatments. With the obtained results, it was possible to observe a grain and precipitates refinement hot extrusion. In addition, through X-ray diffraction analysis, it was possible to confirm the presence of Mg2Si precipitate, which was reinforced by optical microscopies. Also, significant pore reduction was observed after hot extrusion. Finally, the material behaved properly to the aging treatment, reaching its greatest hardness in 2 hours at a constant temperature of 145 ° C, concluding the viability of the speculated route.