High entropy alloys with multi-principal elements is a novel concept for alloy design, which breaks through the traditional alloy design frame work on the base of“one or two major alloy elements”, and became one of hot research topics in materials science and engineering. High entropy alloys are composed of five or more elements which have equal mole or near equal mole ratios. High entropy effects in high entropy alloys arising from the mixture of multi-principal elements, promote the random solid so...