Microstructural development of hypoeutectic Zn–(10–40)wt%Sn solder alloys and impacts of interphase spacing and macrosegregation pattern on hardness
Washington L.R. Santos, Crystopher Brito, Felipe Bertelli, José E. Spinelli, Amauri Garcia
ARTIGO
Inglês
Agradecimentos: The authors acknowledge the financial support provided by FAPESP-São Paulo Research Foundation, Brazil (grants 2012/08494-0, 2012/16328-2 and 2013/13030-5) and CNPq (The Brazilian Research Council)
The most relevant range of compositions of Zn–Sn high-temperature solder alloys remains between 10 and 40 wt%Sn. Hence, transient directional solidification experiments have been carried out with Zn–10, 20, 30 and 40wt%Sn alloys under a wide range of cooling rates with a view to investigating the...
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The most relevant range of compositions of Zn–Sn high-temperature solder alloys remains between 10 and 40 wt%Sn. Hence, transient directional solidification experiments have been carried out with Zn–10, 20, 30 and 40wt%Sn alloys under a wide range of cooling rates with a view to investigating the corresponding microstructural evolution. The microstructure is shown to be formed mainly by an alternation of Zn-rich plate-like cells and a eutectic mixture. Morphological instabilities of the Zn-rich plates are shown to start for the lower content Zn–10 and 20wt%Sn alloys, however a microstructural transition of these plates into cylindrical-type horizontal cells can only be found in the microstructure of the 30 and 40wt%Sn alloys. Experimental growth laws are proposed relating the microstructural spacing (λ) to solidification thermal parameters. Hardness (HV) is shown be affected by both the positive segregation of Sn, the alloy volumetric fraction of Zn and λ. Hall-Petch type equations are proposed relating HV to λ
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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP
2012/08494-0; 2012/16328-2; 2013/13030-5
Fechado
Bertelli, Felipe
Autor
Garcia, Amauri, 1949-
Autor
Microstructural development of hypoeutectic Zn–(10–40)wt%Sn solder alloys and impacts of interphase spacing and macrosegregation pattern on hardness
Washington L.R. Santos, Crystopher Brito, Felipe Bertelli, José E. Spinelli, Amauri Garcia
Microstructural development of hypoeutectic Zn–(10–40)wt%Sn solder alloys and impacts of interphase spacing and macrosegregation pattern on hardness
Washington L.R. Santos, Crystopher Brito, Felipe Bertelli, José E. Spinelli, Amauri Garcia
Fontes
Journal of alloys and compounds. An interdisciplinary journal of materials science and solid-state chemistry and physics (Fonte avulsa) |