Local mechanical properties of Al CoCrCuFeNi high entropy alloy characterized using nanoindentation

With the addition of Al element, the microstructure of high entropy alloy AlxCoCrCuFeNi (x = 0.5, 1.5 and 3.0) changes from single FCC to FCC + BCC and then to single BCC phase. Hardness and elastic modulus of different phases in the HEAs are measured utilizing nanoindentation method. It is found that with the increase of the Al element, the hardness rises more significantly in the BCC phase than that in the FCC phase. The reason is attributed...