high-energy mills. This former definition is not also adapted because the use of dry processing conflicts with examples of moist process of some materials 2. A wider definition was proposed by Schwarz 3, for whom mechanical alloying is a high-energy ball mill technique employed to prepare powder alloys with unequal microstructure. On the Aug 01, 2020 Powders of high-entropy Hf 0.2 Ta 0.2 Ti 0.2 Nb 0.2 Zr 0.2 C (HEC Zr) and Hf 0.2 Ta 0.2 Ti 0.2 Nb 0.2 Mo 0.2 C (HEC Mo) carbides were fabricated through the reactive high-energy ball milling (R-HEBM) of metal and graphite particles.It was found that 60 min of R-HEBM is adequate to achieve a full conversion of the initial precursors into a FCC solid using a Retsch PM400 high energy ball mill. The ball to pow-der ratio was taken as 101 and the milling speed was kept at 200 rpm. The balls and vials used were of tungsten car-bide. Toluene was used as a process controlling agent. The samples were collected after each 10, 20 and 30 h of milling.