Estudo da cinética de envelhecimento e das propriedades mecânicas das ligas de alumínio 6061 e 7075 tratadas termicamente

Abstract

The heat treatments applied in high-performance aluminum alloys are arguably essential to confer to these materials their high mechanical strength, however, these treatments will cause a cost increase, mostly due to the energy associated with the process, what will impact the final product cost. Therefore, seeking to improve its efficiency, this paper studies the influence of heat treatment on the mechanical properties of alloys 6061 and 7075, to better understand the influence of solution temperature-time relationship and the aging temperature on the mechanical properties of these alloys. For 6061 the maximum hardness value was 67.7 RHB, achieved after completion of the solubilization treatment at 530 ° C for 50 minutes, followed by aging temperature of 160 ° C for 18 hours. For the 7075 alloy treatment that resulted in the highest hardness value was the solubilization temperature of 465 ° C for 50 minutes followed by aging at a temperature of 120 ° C for 12 hours, resulting in a hardness of 91.72 HRB.