Avaliação da microestrutura, dureza e impacto de uma liga do sistema Al-Cu

Abstract

For its excellent physical and chemical properties, among which we highlight the low specific weight, corrosion resistance, high thermal conductivity and electrical and infinite recycling, aluminum features a wide range of use that makes the non-ferrous metal more used in the world. The mechanical strength of aluminum is not high, but the addition of alloying elements such as copper and zinc permits to obtain an important use of material in the resilient structure. The main objective of aluminum alloys is increasing the mechanical resistance without detriment to other properties, so that new alloys have been developed, each with appropriate combination of properties suitable for a particular application. Besides the choice of the alloy, it should be emphasized that the mechanical properties of a cast are strongly influenced by the microstructure which is the result of the casting process and the cooling conditions. The microconstituents vary according to the type of alloy and analyzed according to the thermal, mechanical treatments, manufacturing processes and other processes that the material has been referred. In order that this study aims to characterize the AlCu alloy made at the Laboratory of Solidification the Federal University of South and Southeast of Pará (Unifesspa) by microstructure, hardness and impact. Thus, it was necessary to evaluate the ingot making use of metallography as a method to relate the intimate structure of the material and through destructive and non-destructive testing, mechanical properties. The results were compared with literature and certify the studies presented here.