The characteristics of serration in Al0.5CoCrFeNi high entropy alloy

Serrated flow in Al0.5CoCrFeNi high entropy alloy (HEA) was studied at the temperature range of 200-500 °C with strain rates from 10−3 s−1 to 10−4 s−1. Results showed that serration type would transform from type A to type A+B, and eventually evolved into type B+C with the increasing temperature and decreasing strain rate. The dynamic strain aging was the reason for the Portevin-Le Chatelier (PLC) effect, and Al played a crucial role in the interaction between solute atoms and dislocation. The characteristics of serration are revealed through statistics firstly in HEAs.