Artículos de revistas
Numerical and experimental investigation of microporosity formation in a ternary Al-Cu-Si alloy
Registro en:
Journal Of Alloys And Compounds. Elsevier Science Sa, v. 503, n. 1, n. 31, n. 39, 2010.
0925-8388
WOS:000280623000011
10.1016/j.jallcom.2010.04.244
Autor
Ferreira, IL
Lins, JFC
Moutinho, DJ
Gomes, LG
Garcia, A
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) 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. 503 1 31 39 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) FAPERJ (The Scientific Research Foundation of the State of Rio de Janeiro) [E-26/110.664/2009]