Alloy Design and Properties of New α+β Titanium Alloy with Excellent Cold Workability, Superplasticity and Cytocompatibility
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概要
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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 α phase in the α+β two-phase microstructure. Newly developed alloy Ti–4.5%Al–6%Nb–2%Fe–2Mo showed the β transus of 1156 K, a critical rolling reduction over 60%, and yield strength in recrystallization annealing of 910 MPa. An extremely fine α+β two-phase microstructure with α grain size of approximately 1 μm was evolved by annealing at 1048 to 1073 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.
- 社団法人 日本鉄鋼協会の論文
- 2007-05-15
著者
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NARUSHIMA Takayuki
Department of Materials Processing, Tohoku University
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TAIRA Masayuki
Department of Dental Materials and Technology, Iwate Medical University School of Dentistry
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成島 尚之
Department Of Materials Processing Tohoku University
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MURAKAMI Taichi
Department of Materials Processing, Tohoku University
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OUCHI Chiaki
Department of Materials Processing, Tohoku University
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Murakami Taichi
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
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Ouchi C
Department Of Materials Processing Tohoku University
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Ouchi Chiaki
Tohoku University
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Taira Masayuki
Division Of Dental Bio-engineering Department Of Pathogenesis And Control Of Oral Diseases Iwate Med
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Murakami Taichi
Department Of Materials Processing Tohoku University
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Murakami Taichi
Department Of Chemistry And Materials Science Tokyo Institute Of Technology
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Narushima Takayuki
Department Of Materials Processing Graduate School Of Engineering Tohoku University
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Ouchi Chiaki
Department Of Metallurgy Tohoku University
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HIRANO Takahiro
Tohoku University. Now at JFE Steel Corp.
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Ouchi Chiaki
Department Of Materials Processing Graduate School Of Engineering Tohoku University
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TAIRA Masayuki
Department of Biomedical Engineering, Iwate Medical University,
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