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Type: Artigo de periódico
Title: Numerical and experimental investigation of microporosity formation in a ternary Al-Cu-Si alloy
Author: Ferreira, IL
Lins, JFC
Moutinho, DJ
Gomes, LG
Garcia, A
Abstract: Macrosegregation and porosity formation are investigated by both a numerical model and transient directional solidification experiments. The macrosegregation pattern, and the theoretical and apparent densities are presented as a function of the casting length. X-ray fluorescence spectrometry was used to determine the experimental macrosegregation profiles. The measurement of microporosity was performed by a pyknometry procedure. The local composition along an Al-6 wt%Cu-1 wt%Si casting length is used as an input parameter for simulations of microporosity evolution. The results show that the addition of 1 wt% silicon to the Al-Cu alloy composition increases significantly the volumetric fraction of pores as compared with the corresponding porosity exhibited by an Al-6 wt%Cu alloy casting. It is also shown that the use of a carbon steel chill mold induced an abnormal increase in the fraction of pores close to the casting cooled surface which was caused by a higher Fe concentration provoked by the diffusive flux of iron from the chill. (C) 2010 Elsevier B.V. All rights reserved.
Subject: Metals and alloys
Composition fluctuations
Thermal analysis
Computer simulations
Country: Suíça
Editor: Elsevier Science Sa
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2010.04.244
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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