Faculdade de Engenharia Mecânica - FEM/ITEC
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2551
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Navegando Faculdade de Engenharia Mecânica - FEM/ITEC por Autor "COSTA, Thiago Antônio Paixão de Sousa"
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Item Acesso aberto (Open Access) Influência das variáveis térmicas sobre os espaçamentos dendríticos terciários durante a solidificação direcional horizontal da liga Al-6%Cu(2015-03) DIAS FILHO, José Marcelino da Silva; KIKUCHI, Rafael Hideo Lopes; COSTA, Thiago Antônio Paixão de Sousa; MOREIRA, Antonio Luciano Seabra; ROCHA, Otávio Fernandes Lima daThe Al-6wt%Cu alloy was directionally solidified and dendritic microstructure, solidification thermal variables, i.e., tip growth rate (VL), cooling rate (TR) and temperature gradient ahead of liquidus isotherm (GL) were characterized and correlated with tertiary dendritic spacings (λ3) determined experimentally. For this purpose, a horizontal solidification experimental apparatus was developed and specimens were solidified under unsteady state heat flow conditions. It was observed that power laws -1.1 and -0.55 characterize the tertiary spacing variations with tip growth rate (VL) and cooling rate (TR), respectively. Comparisons with other studies published in the literature for Al-Cu alloys solidified in upward and downward vertical directional conditions were performed.Item Acesso aberto (Open Access) Solidification thermal parameters and dendritic growth during the horizontal directional solidification of Al-7wt.%Si alloy(2014-09) CARVALHO, Diego de Leon Brito; COSTA, Thiago Antônio Paixão de Sousa; MOREIRA, Antonio Luciano Seabra; SILVA, Maria Adrina Paixão de Souza da; DIAS FILHO, José Marcelino da Silva; MOUTINHO, Daniel Joaquim da Conceição; ROCHA, Otávio Fernandes Lima daThe main purpose of this work is to investigate the influence of thermal parameters such as growth rate (VL) and cooling rate (TR) on the primary dendrite arm spacings (λ1) during the horizontal transient directional solidification of Al-7wt.%Si hypoeutectic alloy. The primary dendrite spacings were measured along the length of the samples and correlated with these thermal parameters. The variation of dendrite spacings is expressed as a power law function of VL and TR given by the formulas λ1 = 55(VL)-1.1 and λ1 = 212 (TR)-0.55, respectively. A comparative study between the results of this work and those from the literature proposed to investigate these dendrite spacings during the upward and downward vertical directional solidification of Al-7wt.%Si alloy is also conducted. Finally, the experimental data are compared with some predictive dendritic models from the literature.