Development of allergy-free titanium alloys for brass instruments and their characteristics

Toshikazu Akahori, Mitsuo Niinomi, Masaaki Nakai, Harumi Tsutsumi, Takahiro Nozaki, Satoshi Horihata, Toru Suzuki, Keiji Sone

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Binary titanium alloys containing Nb or Ta, which are allergy-free and non-toxicity elements, were fabricated, and then the possibility of their application to various music instruments made of brass was investigated by the evaluation of corrosion characteristics, elastic modulus-density ratio (E/ρ), resonance frequency (f) and internal friction (Q -1). The practical models of the mouthpieces of the trumpets made of the binary titanium alloys were also fabricated by precision casting method in order to compare directly with the sound characteristics of those made of brass and commercially pure Ti. The critical current density for the passivation of the Ti-Nb and Ti-Ta system alloys is approximately 40% lower than that of brass and nearly equal to or a little higher than that of commercially pure Ti. The Q -1 of the Ti-Nb and Ti-Ta system alloys with α″ phase drastically increase. The E/ρ and f of the Ti-Nb and Ti-Ta system alloys exhibit a positive relationship. The sound characteristics of practical mouthpieces of trumpets for a bass instrument can be controlled by changing the E/ρ and/of the alloys.

Original languageEnglish
Pages (from-to)604-610
Number of pages7
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Issue number11
Publication statusPublished - 2008 Nov


  • Density
  • Elastic modulus
  • Internal friction
  • Metal allergy
  • Musical instrument
  • Resonance frequency
  • Titanium alloy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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