Alloy design and properties of new α+ β titanium alloy with excellent cold workability, superplasticity and cytocompatibility

Takahiro Hirano, Taichi Murakami, Masayuki Taira, Takayuki Narushima, Chiaki Ouchi

研究成果: Article査読

5 被引用数 (Scopus)

抄録

Alloy designing and evaluation of various properties of new α+β type titanium alloy with excellent cold workability, superplasticity, and cytocompatibility were conducted. Alloy designing was performed by investigations of the effects of O, Al, Mo, Fe, and Nb contents on cold workability of the alloy with a basic composition of Ti-4.5%Al-4.5%Nb-2%Fe-2%Mo. Use of β stabilizing elements such as V, Ni, or Cu was avoided for biocompatibility. Cold workability was evaluated on the basis of a critical rolling reduction for onset of cracking, hardness under as solution treated condition and hardness variations with a cold rolling reduction. Excellent cold workability was obtained by enhanced thermal and mechanical stabilities of β phase and by lowered hardness of a phase in the α+β two-phase microstructure. Newly developed alloy TM.5%Al-6%Nb-2%Fe-2Mo showed the β transus of 1 156 K, a critical rolling reduction over 60%. and yield strength in recrystallization annealing of 910MPa. An extremely fine α+β two-phase microstructure with a grain size of approximately 1 μm was evolved by annealing at 1 048 to 1 073 K, and a superplastic elongation value of around 3000% was obtained by tensile testing at these temperatures. New alloy showed an excellent cytocompatibility in a cell culture test using L929 cells, yielding a higher value of cell viability over Ti-6%Al-4%V and Ti-6%Al-7%Nb alloys.

本文言語English
ページ(範囲)745-752
ページ数8
ジャーナルIsij International
47
5
DOI
出版ステータスPublished - 2007

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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