2019 Fiscal Year Annual Research Report
Metallurgical Alchemy 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 |
19H05176
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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) |
2019-04-01 – 2021-03-31
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| Keywords | High-entropy alloys / high-entropy ceramics / Functional properties |
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| Outline of Annual Research Achievements |
The concept of ultra-severe plastic deformation was employed in this project to produce high-entropy materials with advanced functional properties. The highlighted achievements of this study can be summarized as follows. (i) We produce a high-entropy alloy with excellent biocompatibility and higher strength compared to conventional Ti-based biomaterials [Mater. Sci. Eng. C, 2020]. (ii) We produced high-entropy hydrides that could reversibly store hydrogen at room temperature with fast kinetics and without need to activation [Scr. Mater., 2020 & Int. J. Hydrogen Energy, 2020]. (iii) We produced the first high-entropy oxide photocatalyst for photocatalytic hydrogen production from water splitting. Our studies confirm the high potential of high-entropy materials for functional applications.
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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 project reached all its targets and was extended to new topics on the application of ultra-severe plastic deformation to achieve new functional high-entropy materials.
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| Strategy for Future Research Activity |
The study will continue for achieving enhanced mechanical and functional properties in high-entropy materials with a focus on hydrogen-related applications. The concept of ultra-severe plastic deformation is used effectively to synthesize these materials. In addition to experiments, theoretical calculations are employed to design the materials and to understand their behavior under investigated conditions. The project moves on several main topics: production of high-entropy oxides and oxynitrides for photocatalytic hydrogen production, production of high-entropy alloys with enhanced strength and ductility under hydrogen atmosphere, and production of high entropy hydrides for application as hydrogen storage materials and negative electrode of nickel-metal-h
ydride batteries.
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