Mechanical property and corrosion resistance evaluations of Ti-6Al-7Nb alloy brazed with bulk metallic glasses

Eri Miura, Hidemi Kato, Toshiaki Ogata, Nobuyuki Nishiyama, Eliot D. Specht, Takanobu Shiraishi, Akihisa Inoue, Kunihiro Hisatsune

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12 Citations (Scopus)


Exploitation of metallic glass as new brazing filler for Ti-based biomedical alloy was attempted. Ti-6Al-7Nb was used as a brazed material, and candidates of bulk metallic glass brazing filler were Cu60Hf 25Ti15, Mg65Cu25Gd10, Zr55Cu30Al10Ni5 and Pd 40Cu30P20Ni10- Convergence infrared-ray brazing was conducted for brazing Ti-6Al-7Nb/metallic glass in Ar atmosphere. After brazing, hardness measurement, X-ray tomography, cross-sectional observation, artificial saliva immersion test and tensile test were performed to evaluate brazability, mechanical property and corrosion resistance of the obtained brazing joints. The results of brazing using these metallic glass fillers show that all the metallic glasses were brazable to Ti-6Al-7Nb except for Mg65Cu25Gd10. Mg 65Cu25Gd10. Cu60Hf 25Ti:5 and their joints collapsed rapidly during immersion test. Zr55Cu30Al10Ni5 joint was the best in terms of degradation resistance; however, tensile strength was inferior to the conventional one. Pd40Cu30Ni10P 20 filler and Zr55Cu30Al10Ni 5 filler and their joints did not show any collapse or tarnish during the immersion test. Pd40Cu30Ni10P20 joint showed the excellent properties in terms of both corrosion resistance and tensile strength, which were superior to a joint brazed using Ti-15Cu-25Ni conventional filler. X-ray tomograph indicates that fracture tends to occur in the vicinity of the brazing interface after tensile test. The brazed metallic glass fillers were fully crystallized, excluding Pd40Cu 30Ni10P20 filler. Pd40Cu 30Ni10P20 brazed filler contained maple-leaf like primary dendrite, peritectoid and a few microns interfacial reaction layer in glassy matrix. The results indicated that Pd40Cu 30Ni10P20 is promising brazing filler for dental or biomaterial devices.

Original languageEnglish
Pages (from-to)2235-2243
Number of pages9
JournalMaterials Transactions
Issue number8
Publication statusPublished - 2007 Aug


  • Artificial saliva
  • Biomaterial infrared joining
  • Brazing filler
  • Bulk metallic glass
  • Degradation test
  • Joint strength
  • Titanium-aluminum-niobium alloy


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