| Project/Area Number |
16360340
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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 |
OHTSUKA Makoto Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Research associate, 多元物質科学研究所, 助手 (30241582)
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| Co-Investigator(Kenkyū-buntansha) |
MURAKAMI Yasukazu Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Associate Professor, 多元物質科学研究所, 助教授 (30281992)
ITAGAKI Kimio Tohoku University, Institute of Multidisciplinary Research for Advanced Materials, Professor, 多元物質科学研究所, 教授 (80006048)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥14,800,000 (Direct Cost: ¥14,800,000)
Fiscal Year 2006: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2005: ¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 2004: ¥8,100,000 (Direct Cost: ¥8,100,000)
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| Keywords | ferromagnetic shape memory alloy / sputtered film / martensitic transformation / Curie temperature / mechanical property / magnetic-field induced phase transformation / magnetic-field induced shape memory effect / constraint aging treatment / マルテンサイト変換 / 磁場中構造解析 / 磁場誘起構造相変態 / 磁場遊戯形状記憶効果 / 引張試験 / 弾性率 / 強磁性体 / 形状記憶合金 |
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| Research Abstract |
Ferromagnetic shape memory alloy is a multifunctional material with ferromagnetism and shape memory effect (SME), and is expected as a magnetic-field (MF) induced actuator material. The MF induced SME will enable the quick response and remote control. In the present study, the relation between the composition and SME was investigated for the Ni_2MnGa films. The films with various compositions were constraint-aged to make the two-way SME. The martensitic transformation (MT) temperature was higher than RT and lower than the Curie temperature (Tc) for the films. The mechanical properties are very important in the practical use. The effects of temperature and MF on mechanical properties of the films have been also investigated. Furthermore, the Fe addition as a ferromagnetic metal in the alloy will be effective for the improvement of magnetic properties and MF induced SME. The structure and SME of Fe-added films were investigated under the MF.
The reversible two-way SME by the thermal change was confirmed for the all constraint-aged films through the MT and its reversion. The two-way SME by the MF up to 5 T was observed around the MT temperature on cooling for the constraint-aged film with the large gradient and the small thermal hysteresis in the strain-temperature curve. The MT temperatures decrease with increasing Fe content, while the Tc increases. The two-way SME by thermal change was also observed for the Fe-added films. The MF induced MT for the Fe-added film was evaluated by an XRD apparatus in high MF up to 5 T. It was confirmed the martensitic phase was stabilized by the MF. Furthermore, the MF induced SME for the Fe-added films was observed by the inducting the MT with MF around MT temperature on cooling. The strain change by the low MF of 1 T became large for the Fe added films.
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