Designing a eutectic multi-principal element alloy for strength-ductility synergy

Abstract

The remarkable combination of castability and strength-ductility synergy found in eutectic multi-principal element alloys featuring alternate lamellar phases is juxtaposed with the challenge of developing new compositions primarily due to the lacuna of established multicomponent phase diagrams. The present work demonstrates a systematic and simplistic single-phase plus eutectic-forming element design strategy to develop a lightweight eutectic multi-principal element alloy (EMPEA). Featuring a combination of face-centered cubic and ordered body-centered cubic phases, the vacuum arc melted alloy exhibited outstanding mechanical properties measured through digital image correlation (ultimate tensile strength of 1014 MPa with 17.5% uniform elongation), surpassing most reported as-cast EMPEAs. © 2024 Elsevier B.V.