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Microstructural Evolution and Mechanical Properties of Vacuum Brazed TC4 Titanium Alloy Joints with Ti-Zr-Ni Filler Metal

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Abstract

Ti-6Al-4V alloy was brazed in vacuum using self-designed and non-copper Ti-38Zr-24Ni (wt.%) filler metal. The microstructural evolution and mechanical properties of the joints were researched. Ni and Zr atoms diffused into based material and led to β-Ti transformation, which formed the diffusion zone. Its microstructure was α-Ti and (Ti, Zr)2Ni eutectoid structures and remained based material. The interface zone was formed through isothermal solidification, which was composed of α-Ti and (Ti, Zr)2Ni by eutectoid transformation. The center zone was comprised of big block brittle (Ti, Zr)2Ni IMCs and some tiny phases: α-Ti and (Ti, Zr)2Ni by hypoeutectic and following eutectoid transformation. The maximum shear strength was 673MPa at 930°C for 45 min. The weak area was the center zone. Cracks initiated and propagated in the brittle (Ti, Zr)2Ni IMCs in the center zone and may be hindered by α-Ti which exhibited the mixed quasi-cleavage and cleavage fractures.

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Acknowledgments

The authors sincerely acknowledge the support by Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology (Shanghai University of Engineering Science). This research was financially supported by National Natural Science Foundation of China (Grant No. 51971129).

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Authors and Affiliations

  1. School of Material Engineering, Shanghai University of Engineering Science, Shanghai, 201620, People’s Republic of China

    Min Liang, Youqiong Qin, Danfeng Zhang & Feng Zhao

  2. Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology, Shanghai University of Engineering Science, Shanghai, 201620, People’s Republic of China

    Youqiong Qin

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  1. Min Liang
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Liang, M., Qin, Y., Zhang, D. et al. Microstructural Evolution and Mechanical Properties of Vacuum Brazed TC4 Titanium Alloy Joints with Ti-Zr-Ni Filler Metal. J. of Materi Eng and Perform 31, 9340–9348 (2022). https://doi.org/10.1007/s11665-022-06907-0

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  • DOI: https://doi.org/10.1007/s11665-022-06907-0

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