Title: Brazing of Ti alloys with Ti-Zr-Cu amorphous filler metal

Authors: Akio Hirose, Makoto Nojiri, Hirotake Ito, Kojiro F. Kobayashi

Addresses: Department of Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan. ' Department of Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan. ' Department of Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan. ' Department of Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

Abstract: Commercial purity titanium (CP-Ti) and Ti-10Zr alloy were brazed with amorphous 25Ti-25Zr-50Cu filler metal using argon gas shielding. To obtain high joint strengths of approximately 400MPa and more, it was necessary that no central brazed layer consisting of intermetallic compounds (Ti,Zr)Cu, (Ti,Zr)2Cu andlor Cu2TiZr remained in the brazed joints after brazing. To this end, the CP-Ti brazes required brazing temperatures of 1193K and more and holding time of at least 120s, in which conditions the joints were fractured in the base metal. On the contrary the Ti-10Zr joints brazed at 1153K and 1173K had joint strengths of approximately 400MPa for a holding time of 300ks and were fractured in the base metal after 600s. This difference between brazeabilities of CP-Ti and Ti-10Zr was explained by considering the microstructural evolution of the brazing filler metals during brazing using the liquidus projection of the Cu-Ti-Zr ternary system.

Keywords: brazing; commercial purity titanium; joint strength; microstructure; titanium alloys; copper; zirconium; amorphous filler materials; brazing filler metals; argon gas shielding; brazed joints.

DOI: 10.1504/IJMPT.1998.036225

International Journal of Materials and Product Technology, 1998 Vol.13 No.1/2, pp.13 - 27

Published online: 01 Nov 2010 *

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