Structural evolutions and tribological properties of laser cladded FeCoNiCrMo high-entropy alloy coating by laser remelting and tempering process: TEM and DFT calculations

• Published in: Tribology international Vol. 199; p. 110000
• Main Authors: Lu, Yuling, Peng, Yuxing, Chang, Xiangdong, Shi, Zhiyuan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2024
• Subjects: Density functional theory calculation; FeCoNiCrMo high-entropy alloy coating; Nanostructure; Tribological property; Tribological property; Density functional theory calculation; FeCoNiCrMo high-entropy alloy coating; Nanostructure
• ISSN: 0301-679X
• DOI: 10.1016/j.triboint.2024.110000

A laser cladded FeCoNiCrMo high-entropy alloy (HEA) coating was treated by laser remelting and tempering process in sequence to improve its tribological properties. The morphologies, phases and nanostructures of obtained coatings were analyzed using a scanning electron microscope, X-ray diffraction and transmission electron microscope. The effects of laser remelting and tempering process on the tribological properties were investigated by a ball-on-disc wear tester, and the wear mechanism was revealed with the density functional theory calculation. The results show that the main crystal planes of laser cladded, laser remelted and tempering processed HEA coatings are transformed from (200) and (220) to (111), and the reduced free energy and differential charge density of crystal plane (111) contribute to the improvement of tribological properties on the HEA coatings. [Display omitted] •The recrystallization by TP promotes the reorientation of crystal planes towards the favorable configurations.•The LC and TP processes play the positive roles in wear resistance.•The TP-HEA coating exhibits the higher wear resistance compared with the LC- and LR-HEA coatings•The (220) crystal plane of transition state on the LR-HEA coating leads to the increase of wear rate.