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Cellular and dendritic growth: Part I. Experiment

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Abstract

An Al-4.1 mass pct Cu alloy was unidirectionally solidified under various growth rates. Features, such as tip radius of curvature, primary arm spacing, and tip concentration were measured as functions of growth rate. Dependence of tip radius on growth rate was different between cells and dendrites. Measured tip radius and primary arm spacing were maximum at the cellular-dendritic transition. Tip concentration, however, monotonously decreases with growth rate. Linear relationships between tip radius and characteristic dimensions of dendrites like core diameter, half length of tip arc, and the first secondary arm spacing are obtained to determine what affects growth rate, convection, and gravity segregation. Experimental results are compared with current theoretical models for dendrite growth under controlled solidification. It was determined that the measured tip radius is larger than that of theoretical predictions at fast growth rate, but the measured tip concentration is in good agreement with theoretical predictions.

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Authors and Affiliations

  1. Faculty of Engineering, The Technological University of Nagaoka, 949-54, Nagaoka, Japan

    Yasunori Miyata (Associate Professor) & Toshio Suzuki (Associate Professor)

  2. Chiyoda Chemical Engineering and Construction Company, Ltd., 108, Tokyo, Japan

    Jun-Ichi Uno

Authors
  1. Yasunori Miyata
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  2. Toshio Suzuki
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  3. Jun-Ichi Uno
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Miyata, Y., Suzuki, T. & Uno, JI. Cellular and dendritic growth: Part I. Experiment. Metall Trans A 16, 1799–1805 (1985). https://doi.org/10.1007/BF02670367

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  • DOI: https://doi.org/10.1007/BF02670367

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