2009 Fiscal Year Final Research Report
Heat-resisting Nb-based material with microstructure control by combining eutectic solidification under high speed cooling, eutectoid decomposition and spheroidization.
| 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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| 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 |
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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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[Journal Article] DEFORMATION BEHAVIOR OF Nb-Si BASED ALLOY HAVING LARGE Nb GRAINS WITH Nb5Si3 DISPERSOIDS2008
Author(s)
Seiji Miura, Yuki Murasato, Yoshihito Sekito, Yukiyoshi Tsutsumi, Kenji Ohkubo, Yoshisato Kimura, Yoshinao Mishima, Tetsuo Mohri
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Journal Title
The 14th International Symposium on Plasticity and Its Current Applications, Sheraton Keauhou Bay Resort, Kailua-Kona, Hawaii
Pages: 457-459
Peer Reviewed
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[Presentation] DEFORMATION BEHAVIOR OF Nb-Si BASED ALLOY HAVING LARGE Nb GRAINS WITH Nb5Si3 DISPERSOIDS2008
Author(s)
Seiji Miura, Yuki Murasato, Yoshihito Sekito, Yukiyoshi Tsutsumi, Kenji Ohkubo, Yoshisato Kimura, Yoshinao Mishima, Tetsuo Mohri
Organizer
The 14th International Symposium on Plasticity and Its Current Applications, Plasticity 2008
Place of Presentation
Sheraton Keauhou Bay Resort, Kona, Hawaii
Year and Date
2008-01-04
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