The Study about Microstructure Characterization of AlCoCrTiNiCu_x High Entropy Alloy System with Multi-principal element

The microstructure and phase structure of AlCoCrTiNiCu_x which are made of six class transition metal elements have been studied in this paper. The results indicated that the change process of microcosmic crystal-structure of the five group high entropy alloy of AlCoCrTiNiCu_x system is transformed from FCC (mainly) + BCC crystal structure (X=0.5, X=0.8) to FCC+BCC+ primary lattice crystal structure (X=1.0, X=1.2), finally, the crystal-structure turn into BCC+ primary lattice crystal structure as the content of Cu further increasing.