Please use this identifier to cite or link to this item: http://repositorio.ufpa.br/jspui/handle/2011/8886
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Type: Artigo de Periódico
Issue Date: Dec-2015
Authors: GOMES, Carlos Henrique Ursolino
KIKUCHI, Rafael Hideo Lopes
BARROS, André dos Santos
SILVA, José Nazareno Santos da
SILVA, Maria Adrina Paixão de Souza da
MOREIRA, Antonio Luciano Seabra
ROCHA, Otávio Fernandes Lima da
Title: On the Natural Convection in the Columnar to Equiaxed Transition in Directionally Solidified Aluminum-based Binary and Multicomponent Alloys
Citation: GOMES, Carlos Henrique Ursolino et al. On the Natural Convection in the Columnar to Equiaxed Transition in Directionally Solidified Aluminum-based Binary and Multicomponent Alloys. Materiais Research, São Carlos, v. 18, n. 6, p. 1362-1371, nov./dez. 2015. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392015000601362&lng=pt&nrm=iso>. Acesso em: 20 jul. 2017. Epub 04-Dez-2015. <http://dx.doi.org/10.1590/1516-1439.036315>.
Abstract: In order to investigate the effect of natural convection in columnar to equiaxed transition (CET), Al-3.0wt.%Cu and Al-3.0wt.%Cu-5.5wt.%Si alloys ingots were obtained during the transient horizontal directional solidification (THDS). Aiming to analyze the effect of superheat in the formation of the macrostructure in ternary Al-Cu-Si alloy, the experiments were conducted with three superheat temperatures above the liquidus temperature of the ternary alloy. A water-cooled solidification experimental device was used. Continuous temperature measurements were made during solidification at different positions in the casting and the data were automatically acquired. Thermal analysis has been applied to determine the thermal parameters such as growth rate (VL), cooling rate (TR) and temperature gradient (GL), whose values have been interrelated with the CET. The observation of the macrostructures has indicated that the resulting thermosolutal convection combined with superheat seem to favor the transition, which did not occur in a single plane, for all ingots obtained, i.e., it has been seen in a range of positions in ingots. The addition of Si element in binary Al-Cu alloy anticipates the CET. A comparison with experimental results for CET occurrence in different growth directions has been carried out.
Keywords: Ligas de alumínio
Solidificação
Análise térmica
Parâmetros térmicos
metadata.dc.relation.ispartof: Materials Research
ISSN: 1980-5373
Country: Brasil
Publisher: Universidade Federal do Pará
Institution Acronym: UFPA
Appears in Collections:Artigos Científicos - FEM/ITEC

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