Stability of FeCrNiTiAl high-entropy alloy at high Temperature

Abstract

High entropy alloys have excellent thermal stability due to its sluggish diffusion effect. Here, we investigated the phase, microstructural and strength stabilities of FeCrNiTiAl alloy. Results show that as-cast alloy exhibits dendrite, interdendrite and eutectic microstructures. No new phase is detected after aging at 800-1100 °C for 144 h, while a small change in the phase content of Laves phase is observed. After exposure at high temperature, the alloy maintains the petal-like morphology, and a small extent of grain coarsening is observed. As compared to the as-cast condition, the relative content of each element remains unchanged. A small decrease in the microhardness can be observed after exposure. But there is no variation in microhardness after exposure for 72 h. These results demonstrate the excellent thermal stabilities of FeCrNiTiAl alloy.