2019 Fiscal Year Final Research Report
Analysis of mechanism of peculiar high strength and ductility of metastable beta-type titanium alloy with high oxygen content for structural biomaterials
Project/Area Number |
17H03419
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Structural/Functional materials
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Research Institution | Meijo University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
赤堀 俊和 名城大学, 理工学部, 准教授 (00324492)
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Project Period (FY) |
2017-04-01 – 2020-03-31
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Keywords | 生体用β型チタン合金 / TNTZ / 高酸素 / 力学的特性 / 降伏現象 / 歪速度 |
Outline of Final Research Achievements |
Macroscopic and microscopic deformation behaviors of Ti-29Nb-13Ta-4,4Zr (TNTZ) with low and high oxygen contents was investigated by conducting tensile tests with different strain rates, deformation observation on the surface of the specimen by optical microscopy, microstructural analysis by electron back scatter diffraction (EBSD), microstructural observations by optical microscopy and transmission electron microscopy (TEM). The peculiar deformation behavior of TNTZ with a high amount oxygen, where both strength and ductility are increased, has been clarified by conjunction with assuming that the formation of the oxygen clusters in the grains occurs.
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Free Research Field |
構造機能材料
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Academic Significance and Societal Importance of the Research Achievements |
チタン合金では酸素は不純物元素と見なされ、脆化をもたらすとされて来たが、本研究成果ではそれを覆す結果が得られている。すなわち、Ti-29Nb-13Ta-4.6Zr合金(TNTZ)では、高酸素添加により強度および延性の両者が向上する。そのメカニズムの解明は、TNTZだけでなく、他のチタン合金への適用が可能と考えられ、酸素を用いた高機能性チタン合金の合金設計および開発に貢献できると考えられ学術的な意義が高い。このことは、安価な侵入型元素である酸素を用いての高機能インプラント器具の開発が可能となる可能性とその低コスト化が期待され社会的意義も大きいと言えよう。
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