Preparation of Feconiwmocr High-Entropy Alloy Coatings Via Double Glow Plasma Surface Alloying Technology
Keywords:
HEA coating; DGPSAT; aging treatment; hardness; tribology propertiesAbstract
In this work, the FeCoNiWMoCr high-entropy alloy (HEA) gradient coatings metallurgically bonded to the substrate was successfully prepared using double glow plasma surface alloying technology (DGPSAT) under vacuum conditions. The HEA coating was then aged at 900 ℃ for 2 h. The microstructure, elemental distribution, mechanical properties, and tribology properties of the HEA coatings was systematically studied. The results showed that the coatings consists of the σ phase, hexagonal closed-packed phase, and face-centered cubic phase, with gradient distribution and uniform elemental composition. The properties of the HEAcoating after aging treatment are greatly improved compared with those before aging treatment. The HEA coating after aging treatmentexhibits good bonding strength with the substrate with a bonding force of 51.4 N. The microhardness is 802 HV, which is nearly 7.5 times higher than that of the substrate. The wear amount is 2×10−3 mm3, almost 6.5 times higher than that of the substrate. The wear mechanism of the HEA coatings is abrasive wear with oxidation wear and adhesive wear. DGPSAT is a practical and useful method for preparing HEA coatings with high hardness and good wear resistance.
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