Design of Face-Centered-Cubic High Entropy Alloys with High Strength and High Toughness

The high-entropy alloy prepared according to the multiple components design concept exhibits excellent comprehensive properties such as high strength, high toughness and good wear resistance, oxidation resistance and thermal stability. Thus it is expected to an excellent new structural material. In terms of composition design of high-entropy alloys, regulating the stacking fault energy and microstructure of the alloy by adjusting the concentration of principal elements, and adding interstitial atoms, and introducing strong toughening mechanisms such as precipitation strengthening, fine grain strengthening and phase transformation or twinning-induced plasticity effect, can be used to improve the comprehensive mechanical properties of the alloy. In this paper, the effects of composition design methods with non-equiatomic and interstitial C/N atom additions on the microstructure, mechanical properties and deformation mechanism of face-centered cubic high-entropy alloy systems are summarized to provide the theoretical basis for the design of the new alloy.