Amorphous-Crystalline Boron-Containing Coating Formed on a High-Entropy Alloy by a Combined Ion-Plasma Method

Abstract

Studies of a boron-containing coating formed on high-entropy alloy specimens by a complex ion-plasma method were carried out. It is shown that the coating has an amorphous-crystalline structure. The size of the areas of the crystalline state of the material is 3-5 nm. Coating hardness, <i>H</i> = 10.1 GPa; Young's modulus, <i>E </i>= 135 GPa; <i>H/E</i> = 0.075; wear parameter, <i>k</i> = 1.2 × 10<sup>-6</sup> mm<sup>3</sup>/N*m; and friction coefficient, μ = 0.15. For an uncoated substrate, <i>H </i>= 2.1 GPa, <i>k</i> = 2.9 × 10<sup>-4</sup> mm<sup>3</sup>/N*m, and μ = 0.62.