CoCrFeMnNiCu

x

high entropy alloys were prepared by vacuum arc furnace

and effects of Cu content on its microstructure and mechanical properties were investigated.The results show that microstructure of the alloys exhibits the dendrites.The dendrites in all alloys are slightly enriched in Co

Cr

Fe

and the interdendritic is slightly enriched in Mn

Ni

while the Cu is segregated easily at interdendritic.The alloys still form a simple FCC solid solution after Cu addition.With the increase of Cu content

the compressive strength and microhardness of the alloys are increased firstly and then decreased

however

the change amplitude is very small.CoCrFeMnNiCu

x

alloy exhibits the highest compressive strength and microhardness when Cu content is 0.8.The compressive strength and microhardness of the six component high entropy alloy containing Cu are the higher than those of the five component high entropy alloy without Cu.