Design and optimization of BNi-2+CoCrNi composite interlayer for GH5188 superalloy TLP bonding
Transient liquid phase (TLP) bonding of GH5188 superalloy was achieved using composite interlayers of BNi-2 and CoCrNi medium-entropy alloy (MEA) powders at 1190 °C/60 min. The critical role of CoCrNi MEA content was systematically investigated. At 0.5–1 wt.%, CrB precipitates dominated the joint mi...
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2025-09-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425020290 |
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| author | Wei Guo Jingru Xin Long Gao Xinlei Ding Peilong Fan Xinrong Li Bosong Tao Jiangtao Xiong Jinglong Li |
| author_facet | Wei Guo Jingru Xin Long Gao Xinlei Ding Peilong Fan Xinrong Li Bosong Tao Jiangtao Xiong Jinglong Li |
| author_sort | Wei Guo |
| collection | DOAJ |
| description | Transient liquid phase (TLP) bonding of GH5188 superalloy was achieved using composite interlayers of BNi-2 and CoCrNi medium-entropy alloy (MEA) powders at 1190 °C/60 min. The critical role of CoCrNi MEA content was systematically investigated. At 0.5–1 wt.%, CrB precipitates dominated the joint microstructure, while 2 wt.% induced γ-matrix coexistence with Si–B compounds. The peak shear strength of 878 MPa (88.4 % of the base metal) was attained at 0.5 wt.% CoCrNi MEA, the interlayers with higher contents triggered fracture mode transitions from ductile (0.5 wt.%) to mixed (1 wt.%) and ultimately brittle failure in the athermal solidification zone (ASZ) at 2 wt.%. Mechanistic analysis revealed that excessive CoCrNi MEA addition (>1 wt.%) impaired interlayer wettability, promoting void nucleation. This work establishes a compositional design framework for high-performance TLP bonding of refractory superalloys in extreme environments. |
| format | Article |
| id | doaj-art-2aaf3cc3da834fa5b8cfd0ebb390dc6b |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-2aaf3cc3da834fa5b8cfd0ebb390dc6b2025-08-20T04:01:57ZengElsevierJournal of Materials Research and Technology2238-78542025-09-01382000200910.1016/j.jmrt.2025.08.076Design and optimization of BNi-2+CoCrNi composite interlayer for GH5188 superalloy TLP bondingWei Guo0Jingru Xin1Long Gao2Xinlei Ding3Peilong Fan4Xinrong Li5Bosong Tao6Jiangtao Xiong7Jinglong Li8State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’ an, 710072, People's Republic of China; National Key Laboratory of Precision Welding & Joining of Materials and Structures, Harbin, 150001, People's Republic of China; Corresponding author. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’ an, 710072, People's Republic of China.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’ an, 710072, People's Republic of ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’ an, 710072, People's Republic of ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’ an, 710072, People's Republic of ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’ an, 710072, People's Republic of ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’ an, 710072, People's Republic of ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’ an, 710072, People's Republic of ChinaState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’ an, 710072, People's Republic of China; Corresponding author.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’ an, 710072, People's Republic of China; Corresponding author.Transient liquid phase (TLP) bonding of GH5188 superalloy was achieved using composite interlayers of BNi-2 and CoCrNi medium-entropy alloy (MEA) powders at 1190 °C/60 min. The critical role of CoCrNi MEA content was systematically investigated. At 0.5–1 wt.%, CrB precipitates dominated the joint microstructure, while 2 wt.% induced γ-matrix coexistence with Si–B compounds. The peak shear strength of 878 MPa (88.4 % of the base metal) was attained at 0.5 wt.% CoCrNi MEA, the interlayers with higher contents triggered fracture mode transitions from ductile (0.5 wt.%) to mixed (1 wt.%) and ultimately brittle failure in the athermal solidification zone (ASZ) at 2 wt.%. Mechanistic analysis revealed that excessive CoCrNi MEA addition (>1 wt.%) impaired interlayer wettability, promoting void nucleation. This work establishes a compositional design framework for high-performance TLP bonding of refractory superalloys in extreme environments.http://www.sciencedirect.com/science/article/pii/S2238785425020290GH5188 superalloyTLP diffusion bondingComposite interlayerMicrostructureMechanical properties |
| spellingShingle | Wei Guo Jingru Xin Long Gao Xinlei Ding Peilong Fan Xinrong Li Bosong Tao Jiangtao Xiong Jinglong Li Design and optimization of BNi-2+CoCrNi composite interlayer for GH5188 superalloy TLP bonding Journal of Materials Research and Technology GH5188 superalloy TLP diffusion bonding Composite interlayer Microstructure Mechanical properties |
| title | Design and optimization of BNi-2+CoCrNi composite interlayer for GH5188 superalloy TLP bonding |
| title_full | Design and optimization of BNi-2+CoCrNi composite interlayer for GH5188 superalloy TLP bonding |
| title_fullStr | Design and optimization of BNi-2+CoCrNi composite interlayer for GH5188 superalloy TLP bonding |
| title_full_unstemmed | Design and optimization of BNi-2+CoCrNi composite interlayer for GH5188 superalloy TLP bonding |
| title_short | Design and optimization of BNi-2+CoCrNi composite interlayer for GH5188 superalloy TLP bonding |
| title_sort | design and optimization of bni 2 cocrni composite interlayer for gh5188 superalloy tlp bonding |
| topic | GH5188 superalloy TLP diffusion bonding Composite interlayer Microstructure Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425020290 |
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