Synergistic effect of Ti and Al on L12-phase design in CoCrFeNi-based high entropy alloys

L1(2)-phase-strengthened high entropy alloys (HEAs) have shown promising mechanical properties for both high temperature and cryogenic applications. However, designing L1(2) phase still strongly relies on the trial-and-error experiments. The current study reported that the L1(2) phase in face centered cubic (FCC) HEAs is greatly influenced by a sygnergistic effect of Ti and Al. The experimental results showed that a Ti/Al ratio ranging from 0.7 to 2 was required by L1(2) phase in CoCrFeNi-based HEAs. The present findings provided an efficient guideline for designing L1(2) phase in the complex concentrated alloys.