The Mathematical Research On The Serration Dynamical Behavior For High-Entropy Alloy

In this paper, we investigate the serration behavior of Al0.5CoCrCuFeNi high-entropy alloy under uniaxial compression tests at cryogenic temperatures, based on mathematical methods. The analysis of kinetic energy and momentum changes well explain the plastic deformation process, and the compression resistance properties are tested by the changes of the amplitude and distribution of serrations. Then, by using the largest Lyapunov exponent, approximate entropy, and Hurst exponent we characterise dynamical behavior of serrations: two dynamical regimes (Chaotic at 4.2 K and 7.5 K. And stable at 9 K) are detected, which represent different slip forms (disordered and ordered).