Influência de tratamentos térmicos na microestrutura e nas propriedades mecânicas da liga de alumínio 319 conformada por spray

Abstract

From an economic and environmental point of view, the use of recycled aluminum alloys has several benefits. Nonetheless, some impurities are incorporated into the liquid metal during reprocessing, leading to the development of coarse intermetallics that depreciate its mechanical properties. In order to settle this problem, diverse forming routes have been studied, aiming to increase the alloy’s range of application. Thus, the main objective of this research is to analyze the influence of heat treatments on the ductility of spray-formed and rotary swaged 319 aluminum alloy. Therefore, aging heat treatment was performed in specimens of the 319 alloy. Then, tensile tests were carried out at room temperature, comparing the results with the literature data for this same alloy, but not heat treated. Moreover, the microstructure of the samples before and after the heat treatments were compared through metallographic analysis, correlating with its mechanical performance. After solubilization and aging treatments, the iron-contaminated alloy became much more ductile, with a percentage of elongation at fracture similar to the primary alloys.