Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/92694
Type: Artigo de periódico
Title: Microstructural Evolution During Upward And Downward Transient Directional Solidification Of Hypomonotectic And Monotectic Al-bi Alloys
Author: Silva A.P.
Spinelli J.E.
Garcia A.
Abstract: Upward directional unsteady-state solidification experiments were performed with both a hypomonotectic Al-2.0 wt% Bi alloy and a monotectic Al-3.2 wt% Bi alloy. Besides, the monotectic composition (3.2 wt% Bi) was directionally solidified under downward transient heat flow conditions, which enables the effects of melt convection on the final microstructure to be evaluated since the collective downward movement of Bi-rich particles is favored in such case. This is due to the density differences between the two coexisting liquid phases. The thermal parameters such as cooling rate, growth rate and thermal gradient were experimentally determined by data collected from cooling curves recorded along the casting length. The monotectic features observed in the Al-3.2 wt% Bi alloy castings, i.e. the interphase spacing and Bi-rich particles diameter were correlated with the growth rate and thermal gradient. The cell spacing was experimentally determined for the Al-2.0 wt% Bi alloy as a function of both the cooling rate and tip growth rate. These experimental data were compared with the main predictive cellular growth models from the literature. A comparison between upward and downward unsteady-state solidification results for the interphase spacing and Bi-rich particles diameter has also been conducted. © 2009 Elsevier B.V. All rights reserved.
Editor: 
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2009.01.105
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-67349283506&partnerID=40&md5=b157a72e50b32e0f76b739d26a5090d8
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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