Abstract
Abstract The Al4.5wt%Cu is an aeronautical and automobile alloy with extensive use in industry for structural purposes. The aim of this work was to evaluate two different solidification processes of the Al4.5wt%Cu alloy, conventional and unidirectional, as well as its recrystallization process. Firstly, the Al4.5wt%Cu alloy was deformed by cold rotary forging and then heat treated at temperatures that varied from 250 to 450 °C. The samples for analysis were obtained after 54, 76 and 91% of reductions in area. Tests of optical microscopy, scanning electron microscopy and Vickers microhardness were performed to evaluate the recrystallization process. The results indicated that the recrystallization started at 350 oC, being that the conventional samples presented full recrystallization after 5 minutes, while the unidirectional samples presented only partial recrystallization. In general, both solidification processes presented similar results for all of the analysis performed.
Highlights
Aluminum alloys (AA) are widely used in aeronautical and automobile industries
The heat treatments most commonly applied in AA include annealing, quenching, precipitation hardening, homogenization and aging at elevated or room temperatures[1,2,3,4,5]
This research aimed to investigate the microstructural differences between the Al4.5wt%Cu alloy alloy produced through conventional solidification, which gives rise to equiaxed dendritic grains, and the same alloy produced through unidirectional solidification, which originates columnar dendritic grains
Summary
Aluminum alloys (AA) are widely used in aeronautical and automobile industries Some characteristics of these alloys incluse low density, good corrosion resistance, high strength, good thermal and electric conductivity. They are considered the most used metallic materials, after iron and steel. According to microstructure and chemical compositions, they can be classified as cast (content of alloying elements between 10 to 12%) or wrought (content of alloying elements between 1 to 2%). These alloys can be divided in two types: heat treatable and non-heat treatable. The heat treatments most commonly applied in AA include annealing, quenching, precipitation hardening, homogenization and aging at elevated or room temperatures[1,2,3,4,5]
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