Journal
NANO LETTERS
Volume -, Issue -, Pages -Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c02097
Keywords
high entropy alloy; cermet; ultrathin film; multiple phase nanostructure; strength ductility trade-off
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Funding
- research grant council (RGC)
- Hong Kong government, through the general research fund (GRF) [N_CityU 109/21, CityU11200719, CityU11213118]
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This study successfully synthesized strong and ductile cermet nanosheets through the reaction between high entropy alloy nanocrystals and poly-vinyl alcohol, overcoming the brittleness issue faced by conventional cermets.
Cermet is an important composite composed of ceramics and metals, which has widespread engineering applications but is notoriously known for its poor ductility. This work synthesizes freestanding cermet nanosheets through the reaction of high entropy alloy nanocrystals with the molecular structure of poly-vinyl alcohol, which results in a unique nanostructure consisting of metallic nanocrystals surrounded by complex amorphous ceramics. Atomic force microscopy indentation shows that such a high entropy alloy derived cermet is strong and tough at ambient temperature with a superb strength (similar to 3.2 GPa) and excellent ductility (similar to 50%), therefore overcoming the long-standing issue of brittleness facing conventional cermets.
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