Novel Co-free ferrous multicomponent alloys containing L12 particles with high density and heterogeneous distribution

Abstract

We report the microstructures and mechanical properties of a novel Co-free Fe46.0Ni28.6Cr18.5Al3.9Ti3.0 multicomponent alloy containing L12 particles with a high density and heterogeneous distribution. The sample annealed at 600 °C for 3 h exhibited various types of L12 particles such as continuous, discontinuous, and incoherent precipitates. The enhanced precipitation strengthening by the heterogeneous precipitation and activation of multiple strengthening mechanisms such as dislocation plasticity, multi-variant stacking faults, and deformation-induced 9R/D024 phases could lead to an exceptional combination of strength and ductility (ultimate tensile strength: 1465 MPa, yield strength: 1265 MPa, total elongation: 17%). © 2023 Acta Materialia Inc.