2021 Fiscal Year Annual Research Report
Multiscale microstructure engineering and the development of high performance, environmental friendly, low cost and thermally stable half-Heusler thermoelectric materials
| Project/Area Number |
18K04744
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
蔡 耀汪 東京工業大学, 物質理工学院, 特任准教授 (80455922)
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| Co-Investigator(Kenkyū-buntansha) |
木村 好里 東京工業大学, 物質理工学院, 教授 (90262295)
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Keywords | Half-Heusler alloys / Microstructure / Interfacial structure / Misfit dislocations / Nanoprecipitates / Nano-modulated structure / Ni-rich nanoclusters / Atomic disorders |
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| Outline of Annual Research Achievements |
This proposal aims to develop high-performance and environmentally friendly half-Heusler thermoelectric materials based on the multiscale microstructure approach to recycle high-temperature waste heat energy. By careful fine compositional tuning, a series of relatively low-cost (Ti,Zr)Ni1+xSn-based half-Heusler alloys contained the microscale half-Heusler phase-separated domains, full-Heusler nanoprecipitates, the atomic scale Ti-Zr modulated structures, and various atomic disorders. The phase stability of these microstructures could be improved simply by subjecting the alloys to a cyclic heating-cooling process at high temperatures between 900 to 1150 degrees Celsius. Among the alloys, the thermoelectric property of an Nb-doped alloy showed the highest ZT of up to 0.87 at 752 K.
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