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Creating complex geometric structures from titanium alloys for heavily loaded equipment uses welding and brazing technologies. Welding cannot be applied to create thin-walled structures, especially in the case of joining titanium with other materials. Hightemperature diffusion brazing (TLP bonding) is much more desirable because of some unique features [1–2]. This technology has numerous advantages. Firstly, the formation of the brazed joint occurs at a temperature below the melting temperature of the base material (or temperature of phase transformation). Secondly, brazing allows you to choose the temperature to maintain the properties of the brazed materials to a high level. Besides that, an accurate selection of brazing filler metals provides thermal stability and high-temperature mechanical properties at the level of the base material. Brazing alloys based on Ag – Cu – Sn – Mn, Ag – Cu – Ti, Al – Si, and Al – Mg systems are widely used for brazing titanium and its alloys. However, the joints obtained using these systems display low mechanical characteristics at high temperatures [2–3]. Titanium and zirconiumbased filler metals demonstrate the capability of creating high-strength and heat-resistant joints between two similar titanium alloys, or between titanium alloys and other metals [4–11]. Application of existing Ti – Zr – Ni – Cu and Zr – Ti – Ni filler metals [12–13], usually with Be additives, causes the formation of brittle intermetallics (Ti,Zr)2Cu, (Ti,Zr)2Ni, and (Ti,Zr)Be2 in the brazed joint [14–15]. It is possible to avoid the formation of brittle phases by ensuring the diffusion of undesirable depressant elements (Cu, Ni, Be) from the seam zone into the base material. Therefore, the use of diffusion brazing, under certain conditions, allows you to get homogeneous plastic structures based on solid solutions in the brazed joint [16–17]. For diffusion brazing of + titanium alloys, it is recommended to use temperatures below the polymorphic transformation point, which lie in the range of 950– 1000 oC [4]. Exceeding the polymorphic transformation temperature leads to grain growth and a significant reduction of the mechanical properties [18–19]. Wrought titanium alloys OT4 and VT6-c (TC4 analogue) are widely used in the aviation industry. The OT4 alloy is classified by its structure as a pseudoalloy. Details of a complex configuration, which work for a long time at a temperature of 300–350 oC, and for a short time at a temperature of 500–600 oC, can be easily manufactured from OT4 alloy. VT6-c alloy is classified by structure as + , and it can be applied for manufacturing of largesized modular aircraft structures [20]. Microstructure formation and mechanical properties of isothermally-solidified titanium alloy joints brazed by a Ti – Zr – Cu – Ni – Be amorphous alloy foil*

non-ferrous metals

Microstructure formation and mechanical properties of isothermally-solidified titanium alloy joints brazed by a Ti – Zr – Cu – Ni – Be amorphous alloy foil