Microstructural characterization and mathematical modeling for determination of volume fraction of eutectoid mixture of the Cu-8.5wt% Sn alloy obtained by unidirectional upward solidification
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Materials Science Forum
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The Cu-8.5wt % Sn alloy presents an extensive microsegregation during its
solidification. That microsegregation results in the formation of a eutectoid mixture, which is
detrimental to subsequent forming processes. This study deals with the influence of solidification
time and cooling rate on the microstructure of that alloy. The unidirectional solidification technique
allowed the acquisition of thermal data. The optical microscopy enabled the microstructural
characterization of the material, the measurement of dendrite arm spacings and the quantification of
the volume fraction of the eutectoid mixture. A semi-analytical mathematical model was proposed
to estimate the volume fraction of the eutectoid mixture. The model expresses the volume fraction
as an implicit function of the Fourier number. The results showed that the microstructure is
dendritic and that the characteristic spacings increase with the solidification time between the
liquidus and the peritectic temperatures. The data also showed that for higher cooling rates the
dendrite arm spacings are smaller and that there is a tendency for the volume fraction of eutectoid
mixture in the columnar zone to increase with the Fourier number and to decrease with the cooling
rate. The proposed model allowed obtaining values of volume fraction with the same order of
magnitude of the experimental data, but with behavior tendency opposite to that observed.
Como referenciar
CRUZ, RICARDO A. da; SANTOS, GIVANILDO A. dos; NASCIMENTO, MAURICIO S.; FRAJUCA, CARLOS; NAKAMOTO, FRANCISCO Y.; SILVA, MARCIO R. da; SANTOS, VINICIUS T. dos; BATALHA, GILMAR F.; COUTO, ANTONIO A. Microstructural characterization and mathematical modeling for determination of volume fraction of eutectoid mixture of the Cu-8.5wt% Sn alloy obtained by unidirectional upward solidification. Materials Science Forum, v. 1012, p. 302-307, 2020. DOI: 10.4028/www.scientific.net/MSF.1012.302. Disponível em: http://200.136.52.105/handle/123456789/31639. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.