Microstructural and electrochemical characterization of Friction Stir Welded aluminum alloys
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2018
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BRAZILIAN MRS MEETING, 17th
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Resumo
Aluminum alloys of 2000 and 7000 series are extensively used in aircraft
structures. However, these classes of aluminum alloys are difficult to join by
conventional fusion welding techniques because the dendritic structure formed in
the fusion zone can seriously compromise the mechanical and corrosion
resistance properties of the joint. Friction Stir Welding (FSW) is attractive for
joining high strength aluminum alloys since there is far lower heat input during
the process compared with conventional welding methods. Frictional heat causes
the metal to soften and allows the tool to traverse along the joint line. The FSW
process generates three distinct microstructural zones: the nugget, the
thermomechanically affected zone and the heat-affected zone. These
microstructural modifications generally interfere in the performance of the
corrosion resistance of welded alloys. In the present study, FSW was used to join
two dissimilar aluminum alloys, AA2024-T3 and AA7475-T651 and the effect of
this process on the corrosion resistance of the welded joints and on the
microstructure of the alloys was evaluated. Microstructural characterization was
carried out by optical microscopy, scanning electron microscopy and atomic force
microscopy. The weld zone regions showed significant microstructural changes.
Electrochemical impedance spectroscopy and Electrochemical noise
measurements were used to evaluate the corrosion resistance of the different
zones of the weld in NaCl solution. The electrochemical results showed that the
corrosion behavior of the aluminum alloy is dominated by the electrochemical
activity within the intermetallics (IMs). The weld zone regions containing copper
IMs have a more noble character than the regions containing Zn and Mg IMs.
Therefore, the results showed an increased susceptibility of welded joints to these
forms of corrosion in comparison to the unaffected base metal by a more severe
attack related to AA7475 alloy.
Como referenciar
MAGNANI, MARINA; GONÇALVES, HAROLDO M.; COSTA, ISOLDA; BENEDETTI, ASSIS V.; FUGIVARA, CECILIO S. Microstructural and electrochemical characterization of Friction Stir Welded aluminum alloys. In: BRAZILIAN MRS MEETING, 17th, September 16-20, 2018, Natal, RN. Abstract... São Carlos: Aptor Software, 2018. p. 1191-1191. Disponível em: http://repositorio.ipen.br/handle/123456789/30339. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.