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Study on the γ/γ′ Eutectic Inhomogeneity of a Novel 3rd Generation Nickel-Based Single-Crystal Superalloy Casting.

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Title: Study on the γ/γ′ Eutectic Inhomogeneity of a Novel 3rd Generation Nickel-Based Single-Crystal Superalloy Casting.
Authors: Liu, Xiaoshan1,2 (AUTHOR), Long, Anping1,2 (AUTHOR), Zhang, Haijie3,4 (AUTHOR) madexin@csu.edu.cn, Ma, Dexin1,2,4 (AUTHOR), Song, Min1 (AUTHOR), Wu, Menghuai2,4 (AUTHOR), Guo, Jianzheng1,2,3 (AUTHOR)
Source: Materials (1996-1944). Nov2025, Vol. 18 Issue 21, p4872. 20p.
Subjects: Eutectic structure, Single crystals, Gas turbine blades, Eutectic reactions, Solidification, Thermal gradient measurment, Nickel alloys
Abstract: In the manufacture of single-crystal blades for aero-engines, the problem of eutectic aggregation on the upper surface of the blades has long been restricting the casting performance improvement. To investigate this phenomenon, this paper employs a simplified blade-like shape casting and focuses a 3rd generation nickel-based single-crystal superalloy as the research material. A systematic analysis is conducted to elucidate the distribution of γ/γ' eutectic during solidification. Experimental results show distinct spatial variations in γ/γ' eutectic distribution. Pronounced eutectic aggregation is observed on the upper surface of the blade but with sparse eutectic dispersion‌ on the lower regions of the casting. Relatively uniform eutectic distribution‌ dominates the mid-section of the specimen. To unravel the underlying mechanisms, this paper utilized a ‌multiphase volume-averaged solidification model‌, developed in prior work, to numerically simulate the γ/γ' eutectic evolution during directional solidification. This computational framework enabled a comprehensive ‌quantitative analysis‌ of spatial and temporal variations in the eutectic volume fraction along the solidification direction. The integration of experimental and modeling approaches provides critical insights into the interplay between thermal gradients, alloy composition, and microstructural heterogeneity. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI 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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  Data: Study on the γ/γ′ Eutectic Inhomogeneity of a Novel 3rd Generation Nickel-Based Single-Crystal Superalloy Casting.
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  Data: <searchLink fieldCode="AR" term="%22Liu%2C+Xiaoshan%22">Liu, Xiaoshan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Long%2C+Anping%22">Long, Anping</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Haijie%22">Zhang, Haijie</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<i> madexin@csu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Ma%2C+Dexin%22">Ma, Dexin</searchLink><relatesTo>1,2,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Song%2C+Min%22">Song, Min</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wu%2C+Menghuai%22">Wu, Menghuai</searchLink><relatesTo>2,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Guo%2C+Jianzheng%22">Guo, Jianzheng</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Nov2025, Vol. 18 Issue 21, p4872. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Eutectic+structure%22">Eutectic structure</searchLink><br /><searchLink fieldCode="DE" term="%22Single+crystals%22">Single crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+turbine+blades%22">Gas turbine blades</searchLink><br /><searchLink fieldCode="DE" term="%22Eutectic+reactions%22">Eutectic reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Solidification%22">Solidification</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+gradient+measurment%22">Thermal gradient measurment</searchLink><br /><searchLink fieldCode="DE" term="%22Nickel+alloys%22">Nickel alloys</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In the manufacture of single-crystal blades for aero-engines, the problem of eutectic aggregation on the upper surface of the blades has long been restricting the casting performance improvement. To investigate this phenomenon, this paper employs a simplified blade-like shape casting and focuses a 3rd generation nickel-based single-crystal superalloy as the research material. A systematic analysis is conducted to elucidate the distribution of γ/γ' eutectic during solidification. Experimental results show distinct spatial variations in γ/γ' eutectic distribution. Pronounced eutectic aggregation is observed on the upper surface of the blade but with sparse eutectic dispersion‌ on the lower regions of the casting. Relatively uniform eutectic distribution‌ dominates the mid-section of the specimen. To unravel the underlying mechanisms, this paper utilized a ‌multiphase volume-averaged solidification model‌, developed in prior work, to numerically simulate the γ/γ' eutectic evolution during directional solidification. This computational framework enabled a comprehensive ‌quantitative analysis‌ of spatial and temporal variations in the eutectic volume fraction along the solidification direction. The integration of experimental and modeling approaches provides critical insights into the interplay between thermal gradients, alloy composition, and microstructural heterogeneity. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI 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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        Value: 10.3390/ma18214872
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        Text: English
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      – SubjectFull: Eutectic structure
        Type: general
      – SubjectFull: Single crystals
        Type: general
      – SubjectFull: Gas turbine blades
        Type: general
      – SubjectFull: Eutectic reactions
        Type: general
      – SubjectFull: Solidification
        Type: general
      – SubjectFull: Thermal gradient measurment
        Type: general
      – SubjectFull: Nickel alloys
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    Titles:
      – TitleFull: Study on the γ/γ′ Eutectic Inhomogeneity of a Novel 3rd Generation Nickel-Based Single-Crystal Superalloy Casting.
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            NameFull: Liu, Xiaoshan
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            NameFull: Long, Anping
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            NameFull: Zhang, Haijie
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            NameFull: Ma, Dexin
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            NameFull: Song, Min
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            – D: 01
              M: 11
              Text: Nov2025
              Type: published
              Y: 2025
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            – TitleFull: Materials (1996-1944)
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