Exploring the effects of temperature on the mechanical properties of high-entropy alloy (CoCrFeNiAl0.1) based on molecular dynamics simulation

Abstract In order to further explore the influence of temperature on the face-centered cubic (FCC) single-phase crystal CoCrFeNiAl 0.1 , we conducted a series of Nano-indentation experiments on CoCrFeNiAl 0.1 at different temperatures. At room temperature, the effects of indentation can convert a portion of CoCrFeNiAl 0.1 ’s FCC phase into a funnel-shaped hexagonal close-packed (HCP) phase, resulting less deformation on the sides of the indenter. What we analyzed shows that CoCrFeNiAl 0.1 ’s HCP phase has excellent heat resistance and mechanics, allowing CoCrFeNiAl 0.1 to maintain great properties in high-temperature environments. However, if T ⩾ 1500 K, high temperature will decrease the number of the HCP phases and dislocation density, leading to an accelerated decline in material strength. This research can provide a theoretical relationship between temperature and microstructural evolution for the research and application of CoCrFeNiAl 0.1 in high-temperature environments.