Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/92975
Type: Artigo de periódico
Title: Correlation Between Mechanical Properties And Dendrite Array Of The Sn-zn Alloy For Lead-free Solder [correlação Entre Propriedades Mecânicas E Arranjo Dendrítico De Ligas Sn-zn Utilizadas Em Solda Sem Presença De Chumbo]
Author: Garcia L.R.
Osorio W.R.
Peixoto L.C.
Garcia A.
Abstract: The development of lead-free solder has been an urgent and hard task for material due to health and environmental concerns over the lead content of conventional solders. The aim of the present work is to investigate the influence of microstructural dendritic array parameters of a Sn-4wt% and 12 wt% Zn lead-free solder alloys on its mechanical properties. A water-cooled (25 °C ±2°C) unidirectional solidification system was used in the experiments. The solidification set-up was designed in such way that the heat was extracted only through the water-cooled bottom, promoting vertical upward directional solidification. The experimental results permitted to establish correlations between thermal parameters and secondary dendrite arm spacings with ultimate tensile strength and elongation. It was concluded that the microstructural refinement has significantly improved the elongation (of about 10%). It was also found that, in a range of the cooling rate of about 0.5 and 10°C/s, the Sn-4 wt% Zn solder alloy has lower variation of the tensile strength (31 to 32 MPa) and elongation than the Sn-12 wt% Zn solder alloy (29 to 33 MPa).
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Rights: aberto
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Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-70349415483&partnerID=40&md5=8c8a5f4474f239e8b44805074bd0dfba
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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