2011 Fiscal Year Final Research Report
Boron modified O phase-based titanium alloy with new phase constitution and reduced Nb content.
| Project/Area Number |
20613012
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Element strategy
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
HAGIHARA Masuo 九州工業大学, 先端エコフィッティング技術研究開発センター, 研究職員 (80354182)
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| Co-Investigator(Kenkyū-buntansha) |
KITAURA Tomoyuki 九州工業大学, 先端エコフィッティング技術研究開発センター, 助教 (30467948)
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| Project Period (FY) |
2008 – 2011
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| Keywords | チタン / O相基合金 / 組成制御 / 組織制御 / ボロン添加 / 引張り特性 |
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| Research Abstract |
The(O+α2)-type O phase-based Ti-27. 5Al-13Nb is a new type of lightweight and high-strength titanium intermetallic alloy. In the present study, the composition was modified to reduce the Nb content, and three derivative alloys, Ti-27. 5Al-8. 7Nb-1Mo, Ti-27. 5Al-5. 5 Nb-1Fe and Ti-27. 5Al-4. 9Nb-1Mo-0. 5Fe, were newly designed. A minor addition of boron(B) and a thermo-mechanical treatment in the(B+α2) two-phase region were found to be effective in refining their microstructures and thus in improving their ductility. Among these alloys, the Ti-27. 5Al-8. 7 Nb-1Mo-0. 1B alloy showed the highest tensile strength and ductility in the whole temperature range up to 800°C, and thus turned out to be a most promising alloy for high temperature applications.
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