Mechanism of epsilon-martensite formation at grain boundaries in biomedical cobalt alloy
| Project/Area Number |
23360299
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
CHIBA Akihiko 東北大学, 金属材料研究所, 教授 (00197617)
MATSUMOTO Hiroaki 東北大学, 金属材料研究所, 助教 (40372312)
LI Yunping 東北大学, 金属材料研究所, 助教 (80546862)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥11,960,000 (Direct Cost: ¥9,200,000、Indirect Cost: ¥2,760,000)
Fiscal Year 2013: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2012: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2011: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
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| Keywords | バイオマテリアル / Co-Cr-Mo合金 / 界面 / 粒界 / 相変態 / 塑性変形 / 疲労 / マルテンサイト / 破壊 / 双晶 / フェーズフィールド法偏析 / 偏析 / フェーズフィールド法 |
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| Research Abstract |
The formation of epsilon-martensite is closely related to the deformability and durability of biomedical Co-Cr-Mo alloys used for artificial hip and knee joints. However, the lack in information of dominant factors and mechanisms of epsilon-martensite have retarded the development of highly-reliable prosthesis. In this study, the formation of epsilon-martensite during plastic deformation under various conditions have been investigated with special focus on the crystal orientation and grain boundaries through electron microscopy, chemical analysis and computer simulations. Detailed knowledge on epsilon-martensite formation including the mechanisms of preferential formation of epsilon-martensite at twin boundaries, and the roles of epsilon-martensite in fracture process under cyclic loading has been obtained, and the This knowledge is useful for developing highly-reliable prosthesis.
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Report
(4 results)
Research Products
(58 results)
