Brazing of Ti₂AlNb based alloy with amorphous Ti-Cu-Zr-Ni filler

Abstract

Amorphous Ti-Cu-Zr-Ni filler foils with low melting point of 1 133 K were synthesized using a melt-spinning method in argon atmosphere. A Ti₂AlNb based alloy was brazed at 1 153–1 223 K for 600–3 000 s. The effects of brazing temperature (T _b) and time (t _b) on the shear strength of the joints were investigated. The results showed that the joint strength was significantly affected by the reaction layer thickness. The optimum brazing parameters can be determined as follows: T _b=1 173 K, and t _b=600 s. The maximum tensile strength of the joint obtained can reach 260 MPa. Furthermore, the activation energy Q and the growth velocity A ₀ of the reaction layer in the brazed joints were calculated to be 161.742 kJ/mol and 0.213 m²/s, respectively. The growth of the reaction layer (y) could be expressed by the expression: y ² =0.213exp(−19 454/T _b)t _b.

Keywords

brazing / Ti₂AlNb / amorphous filler / reaction layer

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