Vacuum brazing Ti2AlNb/GH4169 alloy with (TiZrHf)40(NiCu)55Al5 high-entropy amorphous filler metal
A high-entropy amorphous brazing filler metal(TiZrHf)40(NiCu)55Al5 was designed for vacuum brazing of Ti2AlNb alloy and GH4169 nickel-based superalloy.The effects of brazing parameters on the interfacial microstructure,mechanical properties and fracture behavior of Ti2AlNb alloy/GH4169 nickel-based superalloy brazed joints were studied.The results showed that the brazed joints can be divided into Ti2AlNb/diffusion reaction zone(zone Ⅰ)/brazing seam center zone(zone Ⅱ)/diffusion reaction zone(zone Ⅲ)/GH4169.The typical interface microstructure of brazed joints was Ti2AlNb/B2+Ti2Ni(Al,Nb)/(Ti,Zr,Hf)(Ni,Cu)/(Ni,Cr,Fe,Ti)ss+Cr-rich(Ni,Cr,Fe)ss+Ni-rich(Ni,Cr,Fe)ss+(Ni,Cr,Fe)ss/GH4169.With the increase of brazing temperature and brazing time,the shear strength of brazed joints increased first and then decreased.When the brazing temperature was 1020℃and the brazing time was 15 min,the maximum shear strength of 237 MPa was obtained.The fracture analysis showed that the joint was mainly broken at zone of Ti2Ni(Al,Nb)+(Ti,Zr,Hf)(Ni,Cu)+(Ni,Cr,Fe,Ti)ss,and fracture path gradually expanded to the diffusion reaction zone.The fracture morphology showed typical cleavage fracture characteristics.
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