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|Title:||Horizontally solidified Al-3wt%Cu-(0.5wt%Mg) alloys : tailoring thermal parameters, microstructure, microhardness, and corrosion behavior|
Silva, Adrina P.
|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|
|Appears in Collections:||FEM - Artigos e Outros Documentos|
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