Frictional wear properties of different nano La2O3 composite FeCoNiCrMo high-entropy alloy coatings under soil conditions

In order to mitigate the problem of wear during the working process of earth-touching implements, in this study, nano La 2 O 3 -doped HEA (FeCoNiCrMo) coatings with different dopant contents were fabricated on the surface of 65Mn steel by laser cladding technology, Effects of the coatings on tribological properties of 65Mn steel were investigated in both dry ambient and dry soil environments. The microstructure, chemical composition, hardness, and tribological properties of the wear-resistant La 2 O 3 -doped composite coatings were evaluated. Results of the study show that La 2 O 3 can reduce the incidence of pores in HEA coatings. La 2 O 3 can effectively increase the hardness and wear resistance of the coatings, but too much La 2 O 3 may negatively affect the hardness of the coatings and thus their wear resistance. In dry friction and soil environments, coatings at 0.8% consistently show the lowest wear and the best abrasion resistance properties. In soil environments, the modes are mainly oxidative and adhesive wear, and soil particles act as a buffer medium to greatly reduce the amount of wear.