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Growth Morphologies of a Binary Alloy with Low Anisotropy in Directional Solidification |
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| Authors: | ME Li G C Yang |
| Affiliation: | 1. School of Materials Science and Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, China;1. Centre de Projecció Tèrmica, Fac. Química, Universitat de Barcelona, Diagonal 649 E-08028, Barcelona, Spain;2. Dep. Física Aplicada, Universitat Politècnica Catalunya, Pla Palau 18 E-08003, Barcelona, Spain;3. CELLS - ALBA Synchrotron, 08290 Cerdanyola del Valles, Barcelona, Spain;1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing 100191, China;2. Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996-2100, USA;1. School of Metallurgy and Materials, University of Birmingham, Birmingham B15 2TT, UK;2. Rolls-Royce plc, PO Box 31, Derby DE24 8BJ, UK;3. Department of Materials, University of Oxford, Oxford OX1 3PJ, UK |
| Abstract: | Two new classes of growth morphologies, called doublons and seaweed, were simulated using a phase-field method. The evolution of doublon and seaweed morphologies was obtained in directional solidification. The influence of orientation and velocity on the growth morphology was investigated.It was indicated that doublons preferred growing with its crystallographic axis aligned with the heat flow direction. Seaweed, on the other hand, could be obtained by tilting the crystalline axis to 45°. Stable doublons could only exist in a range of velocity regime. Beyond this regime the patterns formed would be unstable. The simulation results agreed with the reported experimental results qualitatively. |
| Keywords: | growth morphologies low anisotropy phase-field method directional solidification DIRECTIONAL SOLIDIFICATION ANISOTROPY BINARY ALLOY simulation results experimental patterns would unstable Stable exist range regime crystalline hand growing crystallographic axis aligned heat flow direction |
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