Abstract
The article presents the values of the thickness of the surface layer and the surface energy of steel and nickel parts of the aircraft industry. The thickness of the surface layer for the face (100) is about 1.7 nm, which coincides with the thickness of the surface layer of iron - R(I)=M/ρ = 1.7 nm, since iron in these steels is more than 70%. The R(I) layer contains ≈ 6 iron monolayers. In the [111] plane, the lowest value of the surface energy (~1060 mJ/m2 ) is observed. The average thickness of the surface layer of nickel alloys is R(I) ≈ 2 nm, and the number of monolayers is ≈ 6. This value coincides with the number of iron monolayers. The average value of the surface energy of nickel alloys is greater than that of iron-based alloys. The article shows that the hardness of high-entropy (HEA) coatings and metallic glasses (ML) is approximately the same, but almost 2 times higher than the hardness of steel and nickel coatings. For HEAs and MS coatings, the thickness of the surface layer is also approximately the same. In our opinion, there are many similarities between high-entropy alloys and metallic glasses. The friction of steel and nickel coatings lies at the level of 0.4-0.6. For metallic glasses, the coefficient of friction is higher than 0.2 or more. For HEAs, the coefficient of friction is much less than 0.1.