In this study, AlCoFeNi, AlCoFeNiCu and AlCoFeNiZn high entropy alloys prepared by mechanical alloying to investigate the effect of elements on microstructure and mechanical properties. the X-ray diffraction pattern results confirmed the formation of a solid solution after 50 hours mechanical alloying in these alloys. Changes internal structure and morphology were evaluated useing scanning electron microscopy (SEM) equipped with X-ray energy analysis (EDS). arameters investigation of phase stability criteria of alloy were calculated to were in good agreement with the criteria for high entropy alloys formation. predicted the formation of a simple solid solution in all alloys. Thermodynamic stability of formed phase were evaluated using extended mediema model for all synthesized alloys. To evaluate the thermal behavior of the alloys, differential thermal tests (DSC) and thermal weighing (TG) were used. The results showed that AlCoFeNi and AlCoFeNiCu alloys have high thermal stability, while the AlCoFeNiZn alloy retains its stability only up to 450 ° C. In order to construct a volumetric sample, various conditions were used to construct an optimal sample. High-entropy alloy powder was compressed by sparkling plasma spraying under different conditions (temperature, pressure, pulse and storage time). The highest percentage of AlCoFeNi samples was 89%, AlCoFeNiCu was 91% and AlCoFeNiZn was 85%. The mechanical behavior of the alloys was investigated using hardness test, Vickers microtiterification, shear socket and abrasion. The highest hardness values ??for zinc-containing alloys can be attributed to the presence of intraluminal compounds in the structure of BCC. The highest amounts of final shear stress and substrate for copper-bearing alloy were due to the copper element strengthening mechanism and the formation of a solid FCC solution along with BCC, and its lowest value was for zinc containing alloys with BCC structure and The BCC structure did not have the ability to prevent the outbreak. With the results of the study of wear behavior, it was found that with increasing strength, the resistance to wear of the alloy decreased, but the friction coefficient remained constant. The changes in weight loss after 500 m showed different wear rates in the samples and according to the coefficient of friction, all samples had a uniform wear