| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2008: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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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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