Powder metallurgy high-toughness boron-containing high-entropy alloy material and preparation method and application thereof

The invention belongs to the field of high-toughness high-entropy alloy boride, and discloses a powder metallurgy high-toughness boron-containing high-entropy alloy material and a preparation method and application thereof. The method comprises the following steps that firstly, mechanical alloying is completed through a method of carrying out ball milling and adding a dispersing agent so as to obtain near-spherical high-entropy alloy powder with uniform particle size; ultracentrifugation and ultrasonic treatment are carried out on the obtained powder so as to ensure the dispersion of the powder, and the steps are carried out in a reciprocating circulation mode until the particle size of the powder is less than 5 microns; the dispersing agent is removed by adopting rotary evaporation, and then drying treatment is carried out; and the dried powder is subjected to spark plasma sintering and is sintered into a block at the heating rate of 30-200 DEG C/min, the temperature of 800-1700 DEG Cand the axial pressure o