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Competitive Growth Kinetics Between Primary Dendrites and Pseudobinary Eutectics Within Liquid CoCrFeNiSn Quinary Alloy.

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Title: Competitive Growth Kinetics Between Primary Dendrites and Pseudobinary Eutectics Within Liquid CoCrFeNiSn Quinary Alloy.
Authors: Yan, Pengxu1 (AUTHOR), Chang, Jian1 (AUTHOR), Wang, Weili1 (AUTHOR), Zhao, Xiaolei1 (AUTHOR), Hou, Niansi1 (AUTHOR), Wei, Bingbo1 (AUTHOR) bbwei@nwpu.edu.cn
Source: Metallurgical & Materials Transactions. Part A. Jun2025, Vol. 56 Issue 6, p2102-2115. 14p.
Subjects: Eutectic structure, Dendritic crystals, Twinning (Crystallography), Solid solutions, Grain refinement, Eutectics
Abstract: Bulk liquid CoCrFeNiSn quinary alloy has been undercooled by up to 297 K (0.2TL) for exploring its rapid solidification kinetics and associated crystalline orientation features. The constituent phases of this alloy were determined as a FCC γ-Co3Cr3Fe3Ni solid solution and a hexagonal η-(Ni2, Co, Cr, Fe)3Sn2 compound. At small undercooling primary γ phase dendritic growth prevailed and interdendritic η compound appeared as a minor phase. Once liquid undercooling exceeded a threshold of 216 K, the eutectic growth between γ and η phases was induced and led to the formation of refined lamellar eutectic structures. As a comparison, solidification analyses based on small alloy droplets were also conducted to investigate the crystallization behaviors under the conditions of larger undercooling and cooling rate, which revealed a similar microstructural transition from coarse primary dendrite to refined dendrite and finally into lamellar eutectic structure. In particular, complete eutectic growth could be achieved when droplet diameters further decreased below 97 μm, and lamellar eutectic structures became dominant uniquely. As undercooling increased further, remarkable grain refinement was accomplished in both conditions. Electron backscatter diffraction (EBSD) characterizations demonstrated that refined γ phase dendrites exhibited distinct polycrystalline structure and contained a number of twin crystals. For lamellar structures, eutectic growth mode would result in the preferential orientation relationship of {110}γ // {0001}η and ⟨ 332 ⟩ γ / / ⟨ 11 2 ¯ 0 ⟩ η between the two constituent phases. [ABSTRACT FROM AUTHOR]
Copyright of Metallurgical & Materials Transactions. Part A is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Competitive Growth Kinetics Between Primary Dendrites and Pseudobinary Eutectics Within Liquid CoCrFeNiSn Quinary Alloy.
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  Data: <searchLink fieldCode="JN" term="%22Metallurgical+%26+Materials+Transactions%2E+Part+A%22">Metallurgical & Materials Transactions. Part A</searchLink>. Jun2025, Vol. 56 Issue 6, p2102-2115. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Eutectic+structure%22">Eutectic structure</searchLink><br /><searchLink fieldCode="DE" term="%22Dendritic+crystals%22">Dendritic crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Twinning+%28Crystallography%29%22">Twinning (Crystallography)</searchLink><br /><searchLink fieldCode="DE" term="%22Solid+solutions%22">Solid solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Grain+refinement%22">Grain refinement</searchLink><br /><searchLink fieldCode="DE" term="%22Eutectics%22">Eutectics</searchLink>
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  Label: Abstract
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  Data: Bulk liquid CoCrFeNiSn quinary alloy has been undercooled by up to 297 K (0.2TL) for exploring its rapid solidification kinetics and associated crystalline orientation features. The constituent phases of this alloy were determined as a FCC γ-Co3Cr3Fe3Ni solid solution and a hexagonal η-(Ni2, Co, Cr, Fe)3Sn2 compound. At small undercooling primary γ phase dendritic growth prevailed and interdendritic η compound appeared as a minor phase. Once liquid undercooling exceeded a threshold of 216 K, the eutectic growth between γ and η phases was induced and led to the formation of refined lamellar eutectic structures. As a comparison, solidification analyses based on small alloy droplets were also conducted to investigate the crystallization behaviors under the conditions of larger undercooling and cooling rate, which revealed a similar microstructural transition from coarse primary dendrite to refined dendrite and finally into lamellar eutectic structure. In particular, complete eutectic growth could be achieved when droplet diameters further decreased below 97 μm, and lamellar eutectic structures became dominant uniquely. As undercooling increased further, remarkable grain refinement was accomplished in both conditions. Electron backscatter diffraction (EBSD) characterizations demonstrated that refined γ phase dendrites exhibited distinct polycrystalline structure and contained a number of twin crystals. For lamellar structures, eutectic growth mode would result in the preferential orientation relationship of {110}γ // {0001}η and ⟨ 332 ⟩ γ / / ⟨ 11 2 ¯ 0 ⟩ η between the two constituent phases. [ABSTRACT FROM AUTHOR]
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  Label:
  Group: Ab
  Data: <i>Copyright of Metallurgical & Materials Transactions. Part A is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – SubjectFull: Eutectic structure
        Type: general
      – SubjectFull: Dendritic crystals
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      – SubjectFull: Eutectics
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      – TitleFull: Competitive Growth Kinetics Between Primary Dendrites and Pseudobinary Eutectics Within Liquid CoCrFeNiSn Quinary Alloy.
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              M: 06
              Text: Jun2025
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              Y: 2025
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