In this study, the effect of copper coated particles on the properties of CoCrFeNi and AlCoCrFeNi high entropy alloys (HEAs) was studied. Mechanical milling is applied to achieve a good homogeneous distribution of an equiatomic CoCrFeNi and AlCoCrFeNi HEAs for 25 h milling time, followed by an electroless copper plating with 5–20 wt.% Cu by 5 wt.%, have been established. The prepared powder alloys were compacted at 800 MPa, then sintered at 1150 °C, 1200 °C, 1250 °C for Cu x /(CoCrFeNi) 1-x HEA and 900 °C, 950 °C, and 1000 °C for Cu x /(AlCoCrFeNi) 1-x HEA in a vacuum furnace for 90 min. The correlation between the microstructure, density, hardness, wear behavior and corrosion resistance of the fabricated CoCrFeNi, Cu x /(CoCrFeNi) 1-x and Cu x /(AlCoCrFeNi) 1-x HEAs were investigated. The results revealed that, alloys which sintered at 1200 °C for (CoCrFeNi – Cu x /(CoCrFeNi) 1-x HEAs) and at 950 °C for (Cu x /(AlCoCrFeNi) 1-x HEA) exhibit the highest relative density. Densification was enhanced as a result of increasing the nano Cu wt.% content. A dramatic decrease in the produced samples’ hardness was observed where it decreased from 189.1 HV to 134.5 HV for Cu x /(CoCrFeNi) 1-x and from 403 HV to 191 HV for Cu x /(AlCoCrFeNi) 1-x HEAs by the addition of the nano Cu wt.% content. In addition, Wear rate is increased gradually by the addition of the nano Cu wt.% content. The electrochemical results indicate that an increased nano Cu wt.% content corresponds to an increased corrosion rate from 0.297 mm/year to 1.84 mm/year for Cu x /(CoCrFeNi) 1-x and from 0.03 mm/year to 0.093 mm/year for Cu x /(AlCoCrFeNi) 1-x HEAs.