Structure and diffusion of boron dissolved in alpha iron: an integrated approach of first-principle calculation and experiment
| Project/Area Number |
26289231
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Physical properties of metals/Metal-base materials
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
Numakura Hiroshi 大阪府立大学, 工学(系)研究科(研究院), 教授 (40189353)
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| Co-Investigator(Kenkyū-buntansha) |
仲村 龍介 大阪府立大学, 工学(系)研究科(研究院), 准教授 (70396513)
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| Co-Investigator(Renkei-kenkyūsha) |
Sekido Nobuaki 東北大学, 大学院工学研究科, 准教授 (10462516)
Nagata Shinji 東北大学, 金属材料研究所, 准教授 (40208012)
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| Research Collaborator |
Souissi Maaouia
Okuno Takeshi
Ikeda Kentarou
Hamana Keisuke
Kitano Yuuto
Ishimaru Manabu
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| Project Period (FY) |
2014-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
Fiscal Year 2017: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2016: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 格子欠陥 / 拡散 / 鉄鋼材料 / 計算材料科学 / 金属物性 / 状態図 |
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| Outline of Final Research Achievements |
By ab initio calculations we showed that the specific strength of the anelastic relaxation due to stress-induced reorientation of B atoms in solution is close to that of C atoms, and the activation energy is 0.67 eV.
In ion-channelling experiments, we successfully observed channelling phenomena with coarse-grained iron samples, and verified that B can be quantitatively detected by (p, alpha) nuclear reaction. In diffusion experiments we have established the method for measuring the concentration profile of B penetrated to iron matrix by secondary ion mass spectrometry. However, we have not yet succeeded in site location nor obtained the diffusion coefficieint. In mechanical relaxation measurements we observed an anelastic relxation effect in a dilute Fe-B alloy, but whether this is the Snoek relaxation is not yet conclusive.
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Report
(5 results)
Research Products
(6 results)
