| Project/Area Number |
15K14183
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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 |
Material processing/Microstructural control engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
Horita Zenji 九州大学, 工学研究院, 教授 (20173643)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 水素貯蔵合金 / Mg合金 / 超微細結晶粒 / 巨大ひずみ加工 / 結晶粒界 / 巨大ひずみ / 高圧ねじり加工 / 水素結合エネルギー / 格子欠陥 / 積層欠陥 / 結晶・組織制御 |
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| Outline of Final Research Achievements |
Mg alloys were processed by high-pressure torsion so that the grain refinement occurred to the nanosize. Hydrogen absorption became feasible at 423 K with faster hydrogen kinetics. This was due to the introduction of high densities of planar lattice defects such as grain boundaries and stacking faults. High rotation numbers of HPT processing for an MgZr alloy led to atomic order mixture of the elements and it was possible to absorb ~1 wt.% of hydrogen under 9 MPa in ~20 s at room temperature and fully desorb the hydrogen in the air. Two Mg alloys, Mg4NiPd and Mg4NiSn of which compositions were determined based on binding energy engineering, were also processed by HPT. Hydrogen absorption of 1.3% and 0.4%, respectively, was achieved after short time exposure to hydrogen atmosphere at 353 K.
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