Avaliação do efeito dos tratamentos térmicos de solubilização e envelhecimento artificial na microestrutura e propriedade mecânica de ligas do sistema Al-Cu obtidas por solidificação unidirecional

Abstract

In this study we analyzed the effects of solution heat treatment and artificial aging (T6) on the microstructure and mechanical properties of alloys Al-2% Cu, Al-5% Cu and Al-8% Cu obtained by unidirectional solidification. The alloys were solidified in a device for vertical upward unidirectional solidification. The solubilization treatment was conducted at 560ºC for one hour followed by cooling in water. The aging treatment was carried out at temperatures of 150, 180 and 210°C for 8 hours, also followed by cooling in water. The microstructural analysis was carried out by optical microscopy in order to observe the changes caused by heat treatments, the mechanical behavior was evaluated from hardness Brinnell. At the end of the work it was found that the treatments of solubilization and artificial aging (T6) did not cause significant changes in the microstructure of the alloys, however, there was a significant increase in hardness depending on the precipitation of a second phase with better mechanical properties.