A quantitative understanding on the mechanical behavior of AlCoCrFeNi2.1 eutectic high-entropy alloy

Abstract Eutectic high entropy alloys (EHEAs) possess the unique mechanical properties of high strength and ductility. However, the characterization of mechanical behavior and its theoretical verification of EHEAs remain to be solved. In this work, a constitutive mechanical model of AlCoCrFeNi2.1 eutectic high-entropy alloy is established. Mori-Tanaka's homogenization method and Eshelby equivalent inclusion theory are adopted to analyze the problem of multiphase inclusion, and the excellent mechanical properties of the alloy are verified by theoretical methods. The theoretical results are consistent with the experimental date, which proves the authenticity of the model. And the results show that the eutectic phase interface and back stress can improve the strength and ductility of the material to a certain extent. In addition, our analysis found that mechanical properties of EHEAs are sensitive to the volume ratio of two phases, nano-precipitated phase and strain rate. This research has provided a theoretical framework to design excellent mechanical property of EHEAs by optimizing material structure parameters.