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 |
研究課題/領域番号 |
21H00150
|
研究種目 |
新学術領域研究(研究領域提案型)
|
配分区分 | 補助金 |
審査区分 |
理工系
|
研究機関 | 九州大学 |
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)
|
研究期間 (年度) |
2021-04-01 – 2023-03-31
|
研究課題ステータス |
交付 (2022年度)
|
配分額 *注記 |
4,680千円 (直接経費: 3,600千円、間接経費: 1,080千円)
2022年度: 2,470千円 (直接経費: 1,900千円、間接経費: 570千円)
2021年度: 2,210千円 (直接経費: 1,700千円、間接経費: 510千円)
|
キーワード | High-Entropy Alloys / Functional Properties / Plastic Deformation / Mechanical Properties / Microstructure |
研究開始時の研究の概要 |
In this study, the concept of ultra-severe plastic deformation (i.e. inducing shear strains over 1,000) is used to synthesize new high-entropy alloys with advanced functional properties for different applications.
|
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.
|
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.
|
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.
|