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      The columnar to equiaxed transition of horizontal unsteady-state directionally solidified Al-Si alloys

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          Abstract

          Experiments were conducted to investigate the influence of thermal parameters on the columnar to equiaxed transition during the horizontal unsteady-state directional solidification of Al-Si alloys. The parameters analyzed include the heat transfer coefficients, growth rates, cooling rates, temperature gradients and composition. A combined theoretical and experimental approach is developed to determine the solidification thermal variables considered. The increasing solute content in Al-Si alloys was not found to affect significantly the experimental position of the CET which occurred for cooling rates in the range between 0.35 and 0.64 K/s for any of three alloy compositions examined. A comparative analysis between the results of this work and those from the literature proposed to analyze the CET during upward vertical solidification of Al-Si alloys is reported and the results have shown that the end of the columnar region during horizontal directional solidification is abbreviated as a result of about six times higher thermal gradient than that verified during upward unidirectional solidification of alloys investigated.

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          Most cited references 41

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          Steady state columnar and equiaxed growth of dendrites and eutectic

           J.D. Hunt (1984)
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            Prediction of Columnar to Equiaxed Transition during Diffusion-Controlled Dendritic Alloy Solidification

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              Columnar to equiaxed grain transition in as solidified alloys

               J. Spittle (2013)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                mr
                Materials Research
                Mat. Res.
                ABM, ABC, ABPol (São Carlos )
                1980-5373
                April 2014
                : 17
                : 2
                : 498-510
                Affiliations
                [1 ] Universidade Federal do Pará Brazil
                [2 ] Instituto Federal do Pará Brazil
                [3 ] Universidade Federal de São Carlos Brazil
                Article
                S1516-14392014000200032
                10.1590/S1516-14392014000200032
                Product
                Product Information: website
                Categories
                ENGINEERING, CHEMICAL
                MATERIALS SCIENCE, MULTIDISCIPLINARY
                METALLURGY & METALLURGICAL ENGINEERING

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