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Type: Artigo
Title: Horizontally solidified Al-3wt%Cu-(0.5wt%Mg) alloys : tailoring thermal parameters, microstructure, microhardness, and corrosion behavior
Author: Barros, Andre
Cruz, Clarissa
Silva, Adrina P.
Cheung, Noe
Garcia, Amauri
Rocha, Otavio
Moreira, Antonio
Abstract: In the present experimental investigation, Al-3wt%Cu and Al-3wt%Cu-0.5wt%Mg alloys castings are produced by a horizontal solidification technique with a view to examining the interrelationship among growth rate (G(R)), cooling rate (C-R), secondary dendrite arm spacing ((2)), Vickers microhardness (HV), and corrosion behavior in a 0.5M NaCl solution. The intermetallic phases of the as-solidified microstructures, that is, -Al2Cu, S-Al2CuMg, and -Al7Cu2Fe, are subjected to a comprehensive characterization by using calculations provided by computational thermodynamics software, optical microscopy, and scanning electron microscopy/energy-dispersive spectroscopy. Moreover, electrochemical impedance spectroscopy and potentiodynamic polarization tests have been applied to analyze the corrosion performance of samples of both alloys castings. Hall-Petch-type equations are proposed to represent the HV dependence on (2). It is shown that the addition of Mg to the Al-Cu alloy has led to a considerable increase in HV; however, the Al-Cu binary alloy is shown to have lower corrosion current density (i(corr)) as well as higher polarization resistance as compared to the corresponding results of the Al-Cu-Mg ternary alloy
Subject: Ligas de alumínio
Country: Alemanha
Editor: Springer
Rights: Fechado
Identifier DOI: 10.1007/s40195-018-0852-z
Date Issue: 2019
Appears in Collections:FEM - Artigos e Outros Documentos

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