Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/326814
Type: Artigo
Title: Complex Eutectic Growth And Bi Precipitation In Ternary Sn-bi-cu And Sn-bi-ag Alloys
Author: Silva
Bismarck Luiz; Garcia
Amauri; Spinelli
Jose Eduardo
Abstract: Sn-34 wt%Bi, Sn-34 wt%Bi-2wt%Ag and Sn-34 wt%Bi-0.7 wt%Cu alloys have been directionally solidified (DS) under a broad range of solidification cooling rates. Microstructures have been characterized with emphasis on both eutectic growth and precipitation of Bi within the beta-Sn dendritic matrix. The eutectic growth, for all alloys examined, is shown to be associated with the coexistence of coarse and fine lamellar structures with different length-scale of lamellar spacing (lambda). Experimental growth relations of l vs. the cooling rate have been proposed. The length-scale of the lamellae in the fine eutectic ranges from 0.8 to 2.5 mm while in the coarse eutectic from 1.8 to 4.0 mm. Taking as reference the Sn-Bi alloy, both the spacing between Bi precipitates (lambda(p)) and the fine eutectic spacing (lambda(fine)) increase with Cu and Ag additions, whereas lambda(coarse) remains roughly unaltered. Both ternary Sn-Bi-Ag and Sn-Bi-Cu alloys are shown to have worse distributions of both lamellae in the fine eutectic and of precipitates within Sn-rich dendrites, which resulted in decrease in hardness. (C) 2016 Elsevier B.V. All rights reserved.
Subject: Sn-bi-(ag/cu) Alloys
Ternary Eutectic
Solidification
Microstructure
Eutectic Spacing
Editor: Elsevier Science SA
Lausanne
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2016.09.003
Address: http://www.sciencedirect.com/science/article/pii/S0925838816327372
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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