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

We report the microstructures and mechanical properties of a novel Co-free Fe46.0Ni28.6Cr18.5Al3.9Ti3.0 multicomponent alloy containing L1(2 )particles with a high density and heterogeneous distribution. The sample annealed at 600degree celsius for 3 h exhibited various types of L1(2) 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/D0(24) phases could lead to an exceptional combination of strength and ductility (ultimate tensile strength: 1465 MPa, yield strength: 1265 MPa, total elongation: 17%).