Synthesis and Characterization of Nanocrystalline High Entropy Heusler Intermetallics Powders

Metals and Materials International. 2023. Vol. 30. P. 1424–1429.

Ahmad Ostovari Moghaddam, Fereidonnejad R., Naseri M., Shaburova N., Taskaev S., Uporov S., Mikhailov D., Lashkari A. H., Trofimov E.

This study demonstrates the possibility of bringing novel Full Heusler high-entropy intermetallic compounds (FH-HEICs) to nanoscale regime. To this end, Co2(FeNiMnMgZn)Al, Co2(TiZrTaNbCr)Al and Cr2(TiZrTaNbV)(AlSi) FH-HEICs are prepared by mechanical alloying for 20 h. All FH-HEICs crystallize in a mixture of partially ordered B2-type and disordered A2-type crystal structures, which exhibit higher degree of disordering compared to the ideal L21 structure. Scanning electron microscope micrographs and Energy dispersive spectroscopy mapping confirm the homogenous distribution of elements within the nanocrystalline particles. Co2(FeNiMnMgZn)Al and Co2(TiZrTaNbCr)Al exhibited semi hard magnetic behavior with magnetic saturation of 50.93 emu/g and 18.73 emu/g at 300 K, respectively. Cr2(TiZrTaNbV)(AlSi) exhibited hard magnetic behavior with giant coercivity of 3.5 kOe and low magnetic saturation of about 0.2 emu/g. Finally, we introduce FH-HEICs as a novel group of functional materials with potentially intricate magnetic and catalytic properties, in which the order-disorder transition and wide chemical composition range provide unprecedented opportunity to tune their structural and functional properties.

Keywords: Magnetic properties, магнитные свойства, High entropy intermetallic compounds, Высокоэнтропийные интерметаллические соединения, Full Heusler, Nanocrystalline, Полный Гейслер, Нанокристаллические