| 研究領域 | ハイエントロピー合金：元素の多様性と不均一性に基づく新しい材料の学理 |
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| 研究課題/領域番号 |
21H00150
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| 研究機関 | 九州大学 |
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研究代表者 |
エダラテイ カベー 九州大学, カーボンニュートラル・エネルギー国際研究所, 准教授 (60709608)
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| 研究期間 (年度) |
2021-04-01 – 2023-03-31
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| キーワード | High-Entropy Alloys / Functional Properties / Plastic Deformation / Mechanical Properties / Microstructure |
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| 研究実績の概要 |
The concept of ultra-severe plastic deformation was employed to produce high-entropy alloys and ceramics with promising properties for functional applications. The main findings of this study can be summarized as follows. (i) New high-entropy alloys with large fractions of lattice defects and hardness levels comparable to ceramics were developed. (ii) High-entropy hydrides were used as new materials for the anode of Ni-MH batteries, although their discharge capacity was not so high. (iii) The application of high-entropy oxides was extended for photocatalytic CO2 conversion, and it was shown that these oxides can show activities comparable to benchmark photocatalysts. (iv) High-entropy oxynitrides were introduced as new catalysts with low bandgap and high stability for photocatalytic hydrogen production. The findings of this project confirm the high potential of high-entropy alloys, hydrides, oxides and oxynitrides as new functional materials.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
The target of projects were mainly achieved in the first fiscal year and the project can be extended to exploring the mechanisms underling the functional properties of high-entropy materials.
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| 今後の研究の推進方策 |
The project will continue for understanding the mechanism underlying the enhanced functional properties of high-entropy materials. Moreover, it will focus on two important hydrogen-related applications: (i) development of alloys with high hydrogen embrittlement resistance, and (ii) development of hydride with fast and reversible room-temperature hydrogen storage capability. Both experiments and first-principles calculations are employed to understand the mechanism and develop new functional high-entropy alloys.
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