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Experimental evidence of crystal fragmentation from highly undercooled Ni99B1 melts processed on an electrostatic levitator

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Abstract

Employing an electrostatic levitator (ESL) equipped with a CO2 laser heating setup, we solidified Ni99B1 bulk crystals through containerless processing at high undercoolings and observed grain-refined microstructures. The electron backscatter diffraction pattern (EBSP) and analysis of the twin directions were accomplished, from which the primary growth traces with a cellular-like structure were revealed on a macro-millimeter scale. In comparison with the strong mechanical electromagnetic stirring in a sample processed on an electromagnetic levitator, the ESL provides a quite quiescent state for the melt, which enables identification of the primary growth traces after solidification. The present observation supplied experimental evidence that the refined microstructure in the Ni99B1 alloys at the high undercooling regime was due to fragmentation of the primary growth crystal, rather than dynamic nucleation.

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Authors and Affiliations

  1. the Japan Aerospace Exploration Agency (JAXA), The Institute of Space and Astronautical Science (ISAS), Tsukuba Space Center, 305-8505, Tsukuba, Ibaraki, Japan

    Mingjun Li (Jaxa Project Researcher), Takehiko Ishikawa (Associate Professor) & Shinichi Yoda (Professor)

  2. the Japan Aerospace Exploration Agency, The Institute of Space and Astronautical Science, Sagamihara Campus, Sagamihara, 229-8510, Kanagawa, Japan

    Kosuke Nagashio (Research Associate) & Kazuhiko Kuribayashi (Professor)

Authors
  1. Mingjun Li
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  2. Takehiko Ishikawa
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  3. Shinichi Yoda
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  4. Kosuke Nagashio
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  5. Kazuhiko Kuribayashi
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Li, M., Ishikawa, T., Yoda, S. et al. Experimental evidence of crystal fragmentation from highly undercooled Ni99B1 melts processed on an electrostatic levitator. Metall Mater Trans A 36, 3254–3257 (2005). https://doi.org/10.1007/s11661-005-0097-0

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  • DOI: https://doi.org/10.1007/s11661-005-0097-0

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