| Project/Area Number |
19206071
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 | Hokkaido University |
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Principal Investigator |
MIURA Seiji Hokkaido University, 大学院・工学研究科, 准教授 (50199949)
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| Co-Investigator(Kenkyū-buntansha) |
MOHRI Tetsuo 北海道大学, 大学院・工学研究科, 教授 (20182157)
TAKIZAWA Satoshi 北海道大学, 大学院・工学研究科, 助教 (20240632)
WATANABE Seiichi 北海道大学, エネルギー変換マテリアル研究センター, 教授 (60241353)
OHSASA Kenichi 秋田大学, 大学院・工学資源学研究科, 教授 (90111153)
MISHIMA Yoshinao 東京工業大学, 大学院・総合理工学研究科, 教授 (00143660)
KIMURA Yoshisato 東京工業大学, 大学院・総合理工学研究科, 准教授 (90262295)
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥45,760,000 (Direct Cost: ¥35,200,000、Indirect Cost: ¥10,560,000)
Fiscal Year 2009: ¥8,060,000 (Direct Cost: ¥6,200,000、Indirect Cost: ¥1,860,000)
Fiscal Year 2008: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2007: ¥30,030,000 (Direct Cost: ¥23,100,000、Indirect Cost: ¥6,930,000)
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| Keywords | ニオブ / シリサイド / 耐熱合金 / 一方向凝固 / 球状化 / 靭性 / 高温強度 / 共晶凝固 / 共析分解 |
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| Research Abstract |
It was found that a proper microstructure composed of Nb and Nb_5Si_3 was obtained by heat treatment of an Nb-18.1Si-1.5Zr alloy uni-directionally solidified with a rate as high as 1500mm/h. Three-dimensional imaging revealed that large Nb grains are formed through the above-mentioned technique. The alloy shows a room temperature compressive ductility of about 2% and the propagation of cracks in brittle Nb_5Si_3 phase is suppressed by surrounding ductile Nb. Ta addition is required to keep the phase transformation route for the microstructure control with addition of Mo and W for strengthening Nb phase which governs the high temperature deformation behavior.
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