Low-temperature brazing of titanium by the application of a Zr-Ti-Ni-Cu-Be bulk metallic glass (BMG) alloy as a filler

摘要

Titanium (Ti) was successfully brazed at low temperatures below 800 deg C by employing a Zr_(41.2) Ti_(13.8)Ni_(10.0)Cu_(12.5)Be_(22.5) (at. percent) bulk metallic glass (BMG) alloy as a filler. Through the use of this alloy filler, the detrimental segregation of Zr-Cu-Ni filler elements was completely eliminated by heating to well below 800 deg C, so the resultant joint was quite homogeneous with a coarse acicular structure. The disappearance of the Zr-Cu-Ni segregated region was rate-controlled by the diffusion of the filler elements in the Ti base metal. Remarkably, the mechanical property and corrosion resistance of the homogeneous joint brazed at 800 deg C for 10 min were mostly comparable to those of bulk Ti.