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Microstructure Transition and Grain Refinement Mechanism of Undercooled Alloys

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Abstract

The solidification microstructures of undercooled Ni90Cu10 alloys under different undercoolings were studied systematically by means of melt coating and cyclic superheating. In the obtained undercooling range, the solidification structures of the two undercooled alloys have similar transformation processes, and there are two kinds of grain refinement structures under the conditions of low undercooling and high undercooling, respectively. The microstructures of the two grain refinement processes were analyzed in more detail by electronic backscattering diffraction technique. Under the condition of small undercooling, dendrite remelting is considered to be the main reason of grain refinement. However, under the condition of high undercooling, the existence of annealing twins and obvious migration of grain boundary are important evidences for the occurrence of recrystallization process.

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Funding

Funded by the Basic Applied Research Projects in Shanxi Province(No. 201801D221151), and the Key R & D and Promotion Projects in Henan Province(No. 212102210267)

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Authors and Affiliations

  1. College of Mechanical and Electronic Engineering, Huanghe Jiaotong University, Jiaozuo, 454950, China

    Hongtao Li  (李洪涛) & Hongen An  (安红恩)

  2. Faculty of Engineering, University Malaysia Sabah, Kota Kinabalu, 88400, Malaysia

    Nancy Julius Siambun, Bih-Lii Chuab, Melvin Gan Jet Hong & Hongen An  (安红恩)

  3. Henan Engineering Technology Research Center on Intelligent Manufacturing Technology and Equipment, Jiaozuo, 454950, China

    Hongtao Li  (李洪涛) & Hongen An  (安红恩)

Authors
  1. Hongtao Li  (李洪涛)
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  2. Nancy Julius Siambun
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  3. Bih-Lii Chuab
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  4. Melvin Gan Jet Hong
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  5. Hongen An  (安红恩)
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Correspondence to Hongen An  (安红恩).

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Li, H., Siambun, N.J., Chuab, BL. et al. Microstructure Transition and Grain Refinement Mechanism of Undercooled Alloys. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 36, 922–926 (2021). https://doi.org/10.1007/s11595-021-2488-5

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  • DOI: https://doi.org/10.1007/s11595-021-2488-5

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