| Project/Area Number |
25630261
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Physical properties of metals/Metal-base materials
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| Research Institution | Tohoku University |
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Principal Investigator |
OHNUMA Ikuo 東北大学, 工学(系)研究科(研究院), 准教授 (20250714)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 反強磁性合金 / 状態図 / ネール点 / 相分離 / 規則不規則変態 / 相平衡 / 反強磁性 |
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| Outline of Final Research Achievements |
It is well-known that the miscibility gap between ferro- and para-magnetic phases, so-called “Nishizawa horn”, appears along the Curie temperature (TC) curve. It is expected that such a miscibility gap also appears between antiferro- and para-magnetic phases across the Neel temperature (TN) curve due to the excess Gibbs energy of antiferromagnetism. In this study, the miscibility gap between antiferromagnetic and paramagnetic phases in the NiMn-NiZn pseudo-binary system was investigated.
Neel temperatures in the NiMn-NiZn pseudo-binary system was determined by DSC and VSM, which decreases with increasing Zn content. In the microstructure of the NiMn/NiZn diffusion couple heat-treated at 700°C for 3 months, a clear interface was recognized. Two-phase microstructures were also obtained in Ni50(Mn47Zn3) alloy heat-treated at 680°C for 1 and 3 months. In conclusion, the existence of the miscibility gap between antiferro- and para-magnetic phases along the TN curve was confirmed.
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