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Vol. 29. Issue 1.
Materiais 2015
Pages e65-e70 (January - April 2017)
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Vol. 29. Issue 1.
Materiais 2015
Pages e65-e70 (January - April 2017)
DOI: 10.1016/j.ctmat.2016.05.004
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Upward and downward unsteady-state directional solidification of a hypoeutectic Al-3wt.%Mg alloy
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C. Britoa,
Corresponding author
brito87@fem.unicamp.br

Corresponding author.
, F. Bertellif, M.A.P. Castanhoc, P.R. Goulartd, N. Cheungb, J.E. Spinellie, A. Garciab
a Department of Marine Sciences, Federal University of São Paulo, UNIFESP, Santos, SP, Brazil
b Department of Manufacturing and Materials Engineering, University of Campinas, UNICAMP, Campinas, SP, Brazil
c Institute for Technological Research, IPT, São Paulo, SP, Brazil
d Federal Institute of Education, Science and Technology of São Paulo, IFSP, Itapetininga, SP, Brazil
e Department of Materials Engineering, Federal University of São Carlos, UFSCar, São Carlos, SP, Brazil
f Postgraduate Program of Mechanical Engineering, Santa Cecília University, UNISANTA, Santos, SP, Brazil
Article information
Abstract

Solidification thermal parameters, such as growth rate, cooling rate and dendrite arm spacing (λ), have been measured in a hypoeutectic Al-Mg alloy directionally solidified under upward and downward transient heat flow conditions. The experimental setup used in this work consists of a water-cooled mould with heat being extracted from the bottom or the top, promoting upward and downward directional solidification, respectively. It is shown that the dendritic arm spacing are not significantly affected by interdendritic convection for both solidification configurations and single growth laws are proposed for both cases. The Bouchard- Kirkaldy model is shown to overestimate the experimental primary dendritic arm spacing, despite fitting properly the secondary dendrite arm spacing.

Keywords:
Directional solidification
microstructure
convection
Al-Mg alloy
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Copyright © 2017. Portuguese Society of Materials (SPM)
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