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Effects of Ta Addition on the Solidification and Homogenization of Ni-Based Superalloy GH4065A.

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Title: Effects of Ta Addition on the Solidification and Homogenization of Ni-Based Superalloy GH4065A.
Authors: Zhang, Wenyun1,2 (AUTHOR), Li, Linhan1,2 (AUTHOR), Su, Hongyu1,3 (AUTHOR), Wang, Tong3,4 (AUTHOR), Zhang, Ji1,2 (AUTHOR), Ning, Yongquan2,4 (AUTHOR), Zhang, Beijiang1,2,3 (AUTHOR) zhangbeijiang@126.com
Source: Materials (1996-1944). Mar2026, Vol. 19 Issue 5, p1002. 16p.
Subjects: Solidification, Diffusion kinetics, Nickel alloys, Carbides
Abstract: Increased alloying content in advanced Ni-based superalloys for large disc forgings intensifies microsegregation and promotes the formation of detrimental secondary phases, challenging the cast-and-wrought processing route. This study investigates the effects of Ta addition on the solidification and homogenization behaviors of a high-alloyed GH4065A superalloy by comparing the base alloy with a variant containing 5 wt.% Ta (5Ta alloy). As-cast and homogenized microstructures were characterized using SEM and EPMA, solidification behavior was analyzed via DSC, and homogenization kinetics were modeled. Results demonstrate that Ta addition stabilizes the η phase, increasing its solidification temperature and fraction in the as-cast microstructure, but does not alter the solidification sequence. During homogenization, Nb remained the most segregated element and governed the homogenization kinetics, whereas Ta preferentially partitioned into MC carbides and the η phase. The diffusion activation energy for Nb in the 5Ta alloy was determined, and a diffusion model was established to describe the elimination of microsegregation. Optimum homogenization parameters were determined to completely dissolve the η phase and eliminate microsegregation. The results indicate that strategic Ta addition for enhanced performance does not compromise ingot manufacturability, providing valuable guidance for the processing and composition design of advanced disc superalloys. [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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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Effects of Ta Addition on the Solidification and Homogenization of Ni-Based Superalloy GH4065A.
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  Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Wenyun%22">Zhang, Wenyun</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Linhan%22">Li, Linhan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Su%2C+Hongyu%22">Su, Hongyu</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Tong%22">Wang, Tong</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Ji%22">Zhang, Ji</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ning%2C+Yongquan%22">Ning, Yongquan</searchLink><relatesTo>2,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Beijiang%22">Zhang, Beijiang</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> zhangbeijiang@126.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Mar2026, Vol. 19 Issue 5, p1002. 16p.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Solidification%22">Solidification</searchLink><br /><searchLink fieldCode="DE" term="%22Diffusion+kinetics%22">Diffusion kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Nickel+alloys%22">Nickel alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Carbides%22">Carbides</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Increased alloying content in advanced Ni-based superalloys for large disc forgings intensifies microsegregation and promotes the formation of detrimental secondary phases, challenging the cast-and-wrought processing route. This study investigates the effects of Ta addition on the solidification and homogenization behaviors of a high-alloyed GH4065A superalloy by comparing the base alloy with a variant containing 5 wt.% Ta (5Ta alloy). As-cast and homogenized microstructures were characterized using SEM and EPMA, solidification behavior was analyzed via DSC, and homogenization kinetics were modeled. Results demonstrate that Ta addition stabilizes the η phase, increasing its solidification temperature and fraction in the as-cast microstructure, but does not alter the solidification sequence. During homogenization, Nb remained the most segregated element and governed the homogenization kinetics, whereas Ta preferentially partitioned into MC carbides and the η phase. The diffusion activation energy for Nb in the 5Ta alloy was determined, and a diffusion model was established to describe the elimination of microsegregation. Optimum homogenization parameters were determined to completely dissolve the η phase and eliminate microsegregation. The results indicate that strategic Ta addition for enhanced performance does not compromise ingot manufacturability, providing valuable guidance for the processing and composition design of advanced disc superalloys. [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/ma19051002
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        Text: English
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        PageCount: 16
        StartPage: 1002
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      – SubjectFull: Solidification
        Type: general
      – SubjectFull: Diffusion kinetics
        Type: general
      – SubjectFull: Nickel alloys
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      – TitleFull: Effects of Ta Addition on the Solidification and Homogenization of Ni-Based Superalloy GH4065A.
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            NameFull: Zhang, Wenyun
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            NameFull: Su, Hongyu
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              M: 03
              Text: Mar2026
              Type: published
              Y: 2026
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