Brazing Process and Performance of Ti2AlNb Alloy and GH536 Nickel-based Alloy Using AgMn Filler Metal

LI Yin; ZHOU Yumeng; ZHANG Yu; GUO Wei; LONG Weimin; ZHANG Lei

doi:10.3969/j.issn.1674-6457.2025.06.006

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (6) : 56-65. DOI: 10.3969/j.issn.1674-6457.2025.06.006

Precision Brazing

Brazing Process and Performance of Ti₂AlNb Alloy and GH536 Nickel-based Alloy Using AgMn Filler Metal

LI Yin¹, ZHOU Yumeng², ZHANG Yu^3*, GUO Wei³, LONG Weimin⁴, ZHANG Lei⁴

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Abstract

The work aims to investigate the effect of silver-based filler metal AgMn on the brazing performance of Ti₂AlNb alloy and GH536 nickel-based superalloy, analyze the microstructure, reaction products, and mechanical properties of brazing joints, and evaluate the impact of welding parameters on the joint performance. Brazing experiments were carried out on Ti₂AlNb alloy and GH536 superalloy using AgMn filler metal, with welding temperature set between 960 ℃ and 1 020 ℃ and holding time ranging from 5 to 30 min. The microstructure and phase composition of the brazing joints were characterized by optical microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). The mechanical properties of the joints were evaluated through microhardness and shear strength tests. Experimental results showed that as welding temperature and holding time increased, the diffusion-affected zone and interface reaction layer width on the base material side increased, while the Ag layer width in the brazing seam decreased. At welding temperature of 960 ℃ and holding time of 20 minutes, the maximum shear strength at room temperature was 176.9 MPa. The fracture of the joint occurred in the interface reaction zone on the Ti₂AlNb alloy side, at the β-Ti layer, which was the hardest region of the joint, and the fracture mode was brittle. The AgMn silver-based filler metal effectively achieves brazing between Ti₂AlNb alloy and GH536 alloy, with the mechanical properties of the brazed joint significantly affected by welding temperature and holding time. By controlling the welding process parameters, joints with higher strength and no significant defects can be obtained.

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brazing / Ti₂AlNb alloy / nickel-based superalloy / microstructure / mechanical properties

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LI Yin, ZHOU Yumeng, ZHANG Yu, GUO Wei, LONG Weimin, ZHANG Lei. Brazing Process and Performance of Ti₂AlNb Alloy and GH536 Nickel-based Alloy Using AgMn Filler Metal[J]. Journal of Netshape Forming Engineering. 2025, 17(6): 56-65 https://doi.org/10.3969/j.issn.1674-6457.2025.06.006

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