New Route to Synthesize High-Entropy Carbide Powders by Mechanical Alloying

Abstract

AbstractA new route for the synthesis of the (NbTa)$$_{0.67}$$ 0.67 (TiHfZr)$$_{0.33}$$ 0.33 C and (NbTa)$$_{0.67}$$ 0.67 (MoHfW)$$_{0.33}$$ 0.33 C high-entropy carbides powders by mechanical alloying is presented. Namely, pure metal powders were wet-milled in toluene using a planetary mill under an argon atmosphere. The synthesized materials crystallize with a rock-salt structure (space group $$Fm{\bar{3}}m$$ F m 3 ¯ m ). A significant reduction in structural defects with annealing of the samples was detected with X-ray diffraction and positron annihilation experiments. Simultaneously, only simple metallic properties without any trace of magnetic or superconducting phase transitions were observed.