Alloy Design and Property Evaluation of New β Type Titanium Alloy with Excellent Cold Workability and Biocompatibility
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概要
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Alloy designing of new β type titanium alloy with excellent cold workability and biocompatibility was conducted by using total heat numbers of 38 titanium alloys containing Nb, Fe, Ta or Zr in basic compositions of Ti–10%Mo–2%Fe and Ti–14%Mo. Cold workability was evaluated based on hardness values obtained by solution treating and after cold rolling with a rolling reduction ratio up to 90% as well as a critical rolling reduction ratio for onset of cracking. Excellent cold workability in β type titanium alloy was obtained by enhanced thermal and mechanical stability of β phase through optimum addition of β stabilizing elements in Ti–14%Mo base alloy and a reduction of β transus below 1 000 K. Newly developed alloy of Ti–14%Mo–3%Nb–1.5%Zr yields Vickers hardness values of 240 and 284 in as solution treating and after a cold rolling reduction ratio of 90%, respectively, and no cracking occurs in rolling reduction ratio up to 90%. New titanium alloy shows the almost similar level of non-toxicity to other implant titanium materials in the cell culture test using L929 cells, although a slightly increased passive current density is observed by anodic polarization test in both solutions of saline and 1 mass% lactic acid. New austenitic stainless steel of Fe–6%Mn–22%Cr–10%Ni–2%Mo–0.4%N used as one of comparative materials for evaluation of biocompatibility results in the same level of non-toxicity with new titanium alloy, while relatively poor non-toxicity of the Type 316L steel is observed by cell culture test.
- 社団法人 日本鉄鋼協会の論文
- 2006-02-15
著者
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TAIRA Masayuki
Department of Dental Materials and Technology, Iwate Medical University School of Dentistry
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NARUSHIMA Takayuki
Tohoku University Biomedical Engineering Research Organization, Tohoku University
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成島 尚之
Department Of Materials Processing Tohoku University
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井口 〓孝
Department Of Materials Processing Tohoku University
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井口 泰孝
東北大学大学院工学研究科
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OUCHI Chiaki
Department of Materials Processing, Tohoku University
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IGUCHI Yasutaka
Department of Metallurgy, 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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Narushima Takayuki
Tohoku University Biomedical Engineering Research Organization (tubero) Aobayama Materials Science B
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Iguchi Yasutaka
Department Of Materials Processing Tohoku University
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Ouchi Chiaki
Department Of Metallurgy Tohoku University
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TANEICHI Kaori
Department of Materials Processing, Tohoku University
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SUKEDAI Eichi
Department of Mechanical System Engineering, Okayama University of Science
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Sukedai Eichi
Department Of Mechanical System Engineering Okayama University Of Science
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Taneichi Kaori
Department Of Materials Processing Tohoku University
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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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