Interface Microstructure and Tensile Strength of TA2 Titanium Alloy Brazed by Ti-Zr-Cu-Ni Filler Metals

LIU Quanming; XIAO Junfeng; TANG Wenshu; GAO Song; SUN Huawei; QIN Jian; CHENG Yafang; LONG Weimin

doi:10.3969/j.issn.1674-6457.2025.06.004

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (6) : 36-45. DOI: 10.3969/j.issn.1674-6457.2025.06.004

Precision Brazing

Interface Microstructure and Tensile Strength of TA2 Titanium Alloy Brazed by Ti-Zr-Cu-Ni Filler Metals

LIU Quanming^1*, XIAO Junfeng^1*, TANG Wenshu¹, GAO Song¹, SUN Huawei², QIN Jian², CHENG Yafang², LONG Weimin²

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Abstract

The work aims to utilize self-made Ti-Zr-Cu-Ni filler metals to achieve TA2 titanium alloy connection, analyze the microstructure of Ti-Zr-Cu-Ni filler metals and the interface microstructure, erosion resistance and tensile strength of the brazed joints and provide theoretical support for the research and development of titanium based filler metals and brazing processes for repairing the damaged components of gas turbine. SEM and XRD were used to analyze the microstructure of filler metals and brazed joints and study the effect of filler metal types on the tensile properties of brazed joints. Reducing Cu and Ni and adding Sn or V in filler metals reduced the size of (Ti, Zr) solid solutions. Sn and V tended to combine with Ti and Zr to form complex crystal phases and converged into the (Ti, Zr) solid solution. The depths of the element diffusion zone were significantly reduced and there was no significant change in the distance of intergranular infiltration. After introduction of 5.0wt.% Sn and 1.5wt.% V, the tensile strength of the brazed joints was 300.6 MPa and 302.7 MPa, respectively. The amorphous filler metals had no obvious crystal phase, the distance of intergranular infiltration significantly increased, and the tensile strength of the brazed joints was 267.0 MPa. The interface of the brazed joints is fully reactive. After introduction of 5.0wt.% Sn and 1.5wt.% V, the tensile strength decreases slightly, while the tensile strength of amorphous filler metal brazed joint decreases significantly, and the plasticity indexes are improved. The crystal formed by only a small amount of trace elements has limited effect on the strength. The metallurgical reaction of amorphous filler metal is sufficient, forming more brittle phases, and resulting in a significant decrease in joint strength. Adding Sn or V formed crystal phases such as Ti₂Sn₃, Ti₆Sn₅, Zr₅Sn₃ or Ni₃VZr₂, NiV₃, Ni₂V in the microstructure of brazed joints improves the plasticity of the brazed joints.

Key words

Ti-Zr-Cu-Ni filler metals / microstructure of filler metals / TA2 titanium alloy / brazing interface microstructure / tensile strength of brazed joints

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LIU Quanming, XIAO Junfeng, TANG Wenshu, GAO Song, SUN Huawei, QIN Jian, CHENG Yafang, LONG Weimin. Interface Microstructure and Tensile Strength of TA2 Titanium Alloy Brazed by Ti-Zr-Cu-Ni Filler Metals[J]. Journal of Netshape Forming Engineering. 2025, 17(6): 36-45 https://doi.org/10.3969/j.issn.1674-6457.2025.06.004

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Funding

The National Natural Science Foundation of China (52304385); Key Research and Development Program of Shaanxi (2024GX-YBXM-214); Science and Technology Project of China Huaneng Group Co., Ltd. (HNKJ18-H11)