Grain refinement in solidification of highly undercooled eutectic Ni–Si alloy |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, People''s Republic of China;2. Department of Applied physics, Northwestern Polytechnical University, Xi''an 710072, People''s Republic of China;1. Japan Aerospace Exploration Agency, Tsukuba Space Center, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan;2. INO, Remote Sensing Group, 2740 Einstein, Québec, Québec G1P 4S4, Canada;3. Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 305-340, Republic of Korea;4. Department of Science of Measurement, University of Science and Technology, Daejon, 305-333, Republic of Korea;5. Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 51170 Köln, Germany;6. California Institute of Technology, Materials Science Department, Mail Stop 138-78, Pasadena, CA 91125, United States;7. Japan Science and Technology Agency, Precursory Research for Embryonic Science and Technology (PRESTO), Kawaguchi, Saitama 332-0012, Japan;1. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan;2. Advanced Engineering Services Co. Ltd., 1-6-1, Takezono, Tsukuba 305-0032, Japan;3. Japan Sciency and Technology Agency, PRESTO, 4-1-8 Honcho Kawaguchi, Saitama 332-0012, Japan;4. National Optics Institute (INO), Remote Sensing Group, 2740 Einstein, Québec, Québec G1P 4S4, Canada;5. The Graduate University for Advanced Studies (SOKENDAI), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan;1. Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, F-75005 Paris, France;2. Condensed Matter Physics, Ecole Polytechnique, CNRS, 91128 Palaiseau, France;1. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK;2. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;3. Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, UK;4. Department of Materials Science and Engineering, NTNU, 7491 Trondheim, Norway;5. Department of Physics, NTNU, 7491 Trondheim, Norway |
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| Abstract: | Substantial undercooling up to 550 K (0.386TE, with TE as the melting point) was achieved in eutectic Ni78.6Si21.4 alloy melt using glass fluxing combined with cyclic superheating. Accordingly, a particular refined microcrystalline morphology is obtained in the as-solidified structure. The physical mechanism of the grain refinement subjected to high undercooling is interpreted in terms of the classical nucleation theory and LKT/BCT model. It was concluded that the above refinement can be ascribed to the substantially increased nucleation rate under high undercooling. |
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