Nano-sized Cu clusters in deeply undercooled CoCuFeNiTa high entropy alloy

The non-equilibrium response of a high entropy alloy CoCuFeNiTa0.5 has been studied using undercooling as a control parameter. The solidification growth rates are rapid (30-50m/s) at deep undercooling (>150 degrees C) and are comparable with conventional alloys. The elemental segregation especially that of Cu as predicted by phase field simulations in lower (<50 degrees C) undercooling regime matches with the experimental observations. This study indicates that even extreme non-equilibrium conditions during solidification could not avoid elemental segregation at the atomic scale. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.