Conformação por spray em ligas de alumínio 7XXX de aplicação aeronáutica

Abstract

7XXX aluminum series alloys are extremely important in the aircraft industries, with wide application in the aircraft structural components due to high mechanical strength, good corrosion resistance, ductility, and fatigue resistance. Spray forming has become a very important route for aluminum alloys, since it allows obtaining materials free of macrosegregation and with refined microstructure. In contrast, conventional casting routes result in a coarse microstructure with high segregation content of alloying elements. The process is usually followed by mechanical conformation to density the material obtained due to the porosity inherent to the process. The spray-deposited aluminum 7XXX alloys respond effectively to the aging treatment, making it possible to obtain the highest values of mechanical strength, mainly by the metastable η’ phase precipitation. This work is an exploratory research on the aeronautical aluminum 7XXX alloys spray forming process, involving besides theoretical support, presentation of recent data about the use of the technique on 7xxx series alloys.