Simultaneous enhancement of strength and ductility via microband formation and nanotwinning in an L1₂-strengthened alloy.

ABSTRACT: Metallic alloys with high strength and large ductility are required for extreme structural applications. However, the achievement of ultrahigh strength often results in a substantially decreased ductility. Here, we report a strategy to achieve the strength-ductility synergy by tailoring the alloy composition to control the local stacking fault energy (SFE) of the face-centered-cubic (fcc) matrix in an L1₂-strengthened superlattice alloy. As a proof of concept, based on the thermodynamic calculations, we developed a non-equiatomic CoCrNi₂(Al_0.2Nb_0.2) alloy using phase separation to create a near-equiatomic low SFE disordered CoCrNi medium-entropy alloy matrix with in situ formed high-content coherent Ni₃(Al, Nb)-type ordered nano

SUBMITTER: Yang L 

PROVIDER: S-EPMC11197580 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature