Navegando por Autor "BRAGA, José Francisco Aparecido"

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    Proposição de uma Nova Lei de Crescimento para Ligas do Sistema Monotético
    (Instituto de Tecnologia, 2014) BRAGA, José Francisco Aparecido; SOUZA DA SILVA, Maria Adrina Paixão
    Monotectic alloys have promising applications in wear-resistant automotive components. These low-melting temperature dispersions of elements reduce hardness and facilitate flow under sliding conditions, resulting in favorable tribological behavior. Many studies have attempted to better understand the monotectic reaction, assuming that the interphase spacing (λ) follows classical relations used for eutectics. However, some traditional growth laws have not been shown to be valid for transient heat flow conditions. This work analyzed unidirectional solidification experiments in unsteady conditions with hypomonotectic alloys Al-0.9%Pb and Al-5.5%In, in addition to the monotectic alloy Al-1.2%Pb.
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    Proposição de uma Nova Lei de Crescimento para Ligas do Sistema Monotético
    (Instituto de Tecnologia, 2014) BRAGA, José Francisco Aparecido; SILVA, Maria Adrina Paixão de Souza da
    Monotectic alloys show promising applications in wear-resistant automotive components. This study proposes a new growth law for monotectic alloy systems, analyzing experimental results of unidirectional solidification under transient conditions. Growth laws as a function of position and velocity were established, allowing the evaluation of factors such as gravity and solute type on microstructure formation. The results indicate that monotectic growth does not follow the classical eutectic model, being significantly influenced by thermocapillary convection.