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      The columnar to equiaxed transition in the directional solidification of aluminum based multicomponent alloys Translated title: A transição colunar-equixial na solidificação directional de ligas multicomponentes à base de alumínio

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          Abstract

          In this work the columnar to equiaxed transition (CET) was experimentally investigated in the unidirectional solidification of three aluminum based multicomponent alloys (Al-nSi-3Cu), with "n" equal to 5.5, 7.5 and 9 wt.%. The main parameters analyzed include the tip temperature gradient (GL), tip growth rate (VL), tip cooling rate (TR) and Si content. A water-cooled solidification experimental setup was developed, and specimens were solidified under unsteady state heat flow conditions. It is shown that for the alloys examined, the solute concentration influences the position of the CET, which occurs for an average cooling rate of about 1.17 0C/s. A comparative analysis between the results of this work and those from literature proposed to analyze the CET during upward vertical solidification of Al-Si alloys is reported and the results show that the end of the columnar region is abbreviated as a result of seven times higher critical cooling rate than that verified for Al-Si alloys.

          Translated abstract

          Nesse trabalho, a transição colunar/equiaxial (TCE) foi investigada experimentalmente na solidificação unidirecional de três ligas multicomponentes à base de alumínio (Al-nSi-3Cu), com “n” igual a 5,5, 7,5 e 9% em massa. Os principais parâmetros analisados foram o gradiente de temperatura (GL), a velocidade de deslocamento da isoterma liquidus (VL), a taxa de resfriamento (TR) e a composição de Si. Um dispositivo de solidificação direcional refrigerado à agua para fluxo de calor transitório foi utilizado. Para todas as ligas examinadas, os resultados mostram que a concentração de soluto inflencia na posição da TCE, a qual ocorre para uma taxa de resfriamento igual a 1.17 0C/s. A análise comparativa entre os resultados desse trabalho com os da literatura, propostos para analizar a TCE em ligas Al-Si, é conduzida e os resultados mostram que o final da região colunar acontece para uma taxa de resfriamento sete vezes maior que a encontrada para ligas Al-Si.

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          From constrained to unconstrained growth during directional solidification

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            Investigation of columnar–equiaxed transition and equiaxed growth of aluminium based alloys by X-ray radiography

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              Microestrutura dendrítica, macrossegregação e microporosidade na solidificação de ligas ternárias Al-Si-Cu.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rem
                Rem: Revista Escola de Minas
                Rem: Rev. Esc. Minas
                Escola de Minas (Ouro Preto )
                1807-0353
                March 2015
                : 68
                : 1
                : 85-90
                Affiliations
                [1 ] Instituto Federal do Pará Brazil
                [2 ] Instituto Federal do Pará Brazil
                [3 ] Instituto Federal do Pará Brazil
                [4 ] Universidade Federal Fluminense Brazil
                [5 ] Universidade Estadual de Campinas Brazil
                Article
                S0370-44672015000100085
                10.1590/0370-44672015680237
                b0322351-a146-4521-896b-061bf37bb2f1

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0370-4467&lng=en
                Categories
                ENGINEERING, CIVIL
                METALLURGY & METALLURGICAL ENGINEERING

                General engineering,Civil engineering
                solidificação direcional,macroestruturas,ransição colunar/equiaxial,ligas Al-Si-Cu,Al-Si-Cu alloys,Directional solidification,Macrostructures,Columnar/equiaxed transition

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