| Project/Area Number |
18K18933
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 26:Materials engineering and related fields
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2018-06-29 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2018: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Keywords | 生体材料 / 形状記憶合金 / 超弾性 / マルテンサイト変態 / コバルト合金 / コバルトクロム合金 / 医療材料 / 状態図 |
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| Outline of Final Research Achievements |
In this study, the composition range of the BCC single phase at 1200C was determined in the Co-Cr-Al-Si system. The composition dependence of the martensitic transformation temperatures and Curie temperature of the parent phase were also determined. Using these results, the alloy composition for superelastic alloy was selected. A compressive superelastic test was conducted in Co-Cr-Al-Si single crystal and good superelasticity was obtained. Anomalous negative temperature dependence of the critical stress for martensitic transformation was observed. It was found in this study that Co-Cr superelastic alloy with good corrosion resistance is promising for a new biomaterial.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、新しいCo-Cr-Al-Si系超弾性合金の研究を行い、その合金設計の基礎情報を得たことは今後の材料開発にとって重要である。さらに、設計した合金で超弾性試験を行い、明確な超弾性が得られることも実証できた。比較的高いCr濃度を有する本Co-Cr-Al-Si合金は耐食性に優れることも確認でき、新しい生体用超弾性として有望であると考えられる。
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