## 1 Introduction  
High entropy alloys (HEAs) have received significant research focus in recent years since they were proposed [1; 2; 3; 4; 5; 6]. Due to their unique compositions, HEAs exhibit some interesting properties, such as high strength, outstanding fracture toughness, good fatigue resistance and high hardness at elevated temperatures [7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17]. Thermal spray technology is a process in which the spraying powder is heated or melted by a focused thermal energy. During the process, the powder is accelerated and deposited onto the substrate surface to form the coating. High-velocity-oxygen-fuel (HVOF) technology is a commonly used thermal spray technology that has a lower particle temperature and higher flight particle velocity. The low temperature can reduce the oxidation of particles during melting while the high velocity can produce dense coating after high speed impact on the matrix. HEAs can be deposited on substrates to form protective coatings by thermal spraying techniques and the coatings retain the microstructure and excellent properties [18; 19; 20; 21; 22]. It is worth noting that wear behavior is a very important property amongst the mechanical properties in applications. For example, the wear behavior of molds, tools and structural components cannot be neglected in applications. However, there are few studies on the wear behavior of HEA coatings for now. [PERSON] et al. [4] investigated the wear behavior of AlCrFeMo\({}_{0.5}\)NiSiSiTi and AlCoCrFeMo\({}_{0.5}\)NiSiTi coatings produced by atmospheric plasma spraying. The wear resistance of the coatings was similar to SUJ2 steel, and the hardness of the coatings was 525 HV and 485 HV, respectively. When the coatings were heat-treated for 1 h at 800 \({}^{\circ}\)C, the hardness increased to 900 HV and the wear resistance was better than SUJ2 steel and SKD61 steel. [PERSON] et al. [23] studied the hardness and the wear resistance of AlCoCrFeNiTi HEA coatings produced by HVOF. The hardness of the coating amounted to 730 HV\({}_{0.1}\), and the coating exhibited outstanding wear resistance in oscillating wear, ball-on-disk and scratch tests. [PERSON] et al. [3] studied the wear behavior of NiCo\({}_{0.6}\)Fe\({}_{0.2}\)Cr\({}_{1.5}\)SiAlTi\({}_{0.2}\) HVOF coatings. They found that the wear resistance of the coating was better than SUJ2 steel and SKD61 steel. As an important surface treatment process, laser remelting process is often used to improve the density and bonding strength as wel as to reduce the porosity of coatings. However, thus far, research involving laser remelted HEA coatings is sparse. [PERSON] et al. [24] investigated the effect of laser remelting processing on microstructure and wear behavior of laser clad Ni-Cr-Co-Ti-V high entropy alloy coating. The results showed that the phase composition of the coating remained unchanged and the micro-hardness increased to 900 HV after laser remelting processing. In contrast to the as-clad high-entropy alloy coating, the laser remelted high-entropy alloy coatings had a lower friction coefficient and lower wear mass, and the worn mechanism of as-clad and as-remelted high-entropy alloy coatings showed adhesive wear.  
To date, the wear behavior of laser remelted HVOF coatings have been reported rarely. It was reported that the laser remelting process could improve the compactness [25]. Therefore, in the present study, the laser remelting process was used to produce the laser remelted FeCrCoNiTiAl\({}_{0.6}\) HVOF coating. The microstructure, phase composition and hardness of the coating was analyzed. The wear behavior and the wear mechanism were investigated at room temperature. In order to compared the properties, the as-sprayed HVOF coating was also investigated in this study.