2021 Fiscal Year Annual Research Report
Superfunctional High-Entropy Nanomaterials by Ultra-Severe Plastic Deformation
Publicly Offered Research
| Project Area | High Entropy Alloys - Science of New Class of Materials Based on Elemental Multiplicity and Heterogeneity |
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| Project/Area Number |
21H00150
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| Research Institution | Kyushu University |
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Principal Investigator |
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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| Project Period (FY) |
2021-04-01 – 2023-03-31
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| Keywords | High-Entropy Alloys / Functional Properties / Plastic Deformation / Mechanical Properties / Microstructure |
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
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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| Strategy for Future Research Activity |
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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[Journal Article] Phase transformations in Al-Ti-Mg powders consolidated by high-pressure torsion: experiments and first-principles calculations2022
Author(s)
Y. Tang, M. Murayama, K. Edalati, Q. Wang, S. Iikubo, T. Masuda, Y. Higo, Y. Tange, Y. Ohishi, M. Mito, Z. Horita
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Journal Title
Journal of Alloys and Compounds
Volume: 889
Pages: 161815
DOI
Peer Reviewed / Int'l Joint Research
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