Caracterização microestrutural da AA2024-t3 revestida com AA2024-t3 por friction surfacing

Abstract

This work aimed to evaluate a study on advanced technique for coatings in components or structures made aluminum alloys using friction surfacing process. This way, it was investigated influence of axial load variation on the deposition process by Friction Surfacing. All experiments were performed using a FSW machine from the National Center for Energy and Materials Research, CNPEM-LNNano, Campinas - São Paulo. AA2024-T3 Aluminum alloy rods were deposited on substrates of the same alloy. After deposition process by Friction Surfacing, all deposit-substrate interface was characterized with relation to their morphology, as also macro and microstructure analyzes from the stereoscopic microscopy (SM), light microscopy (LM), scanning electron microscopy (SEM) techniques and energy dispersive spectroscopy (EDS) microanalysis. As consequence, can be obtained grain size, misorientation, Schmid Factor, Taylor Factor, recrystallization percentage and microtexture by EBSD technique using a scanning electron microscope with field emission (FEG-SEM). In order to evaluate the mechanical properties along the deposit thickness and especially the adhesion strength from deposit-substrate interface, microhardness tests and tensile tests were performed, respectively. Microstructures and EDS analyses showed that was possible to reveal that the friction surfacing bonding occurs by diffusion. Tensile properties of the substrate with deposit such as Yield Strength and Ultimate Tensile Strength were lower in 17% and 15%, respectively, in relation to base metal. Experimental results showed that the best deposits were produced with 14 and 13.5 kN loads.