Multiscale nanoindentation modelling of concentrated solid solutions: A continuum plasticity model

Recently developed single-phase concentrated solid-solution alloys (CSAs) contain multiple elemental species in high concentrations with different elements randomly arranged on a crystalline lattice. These chemically disordered materials present excellent physical properties, including high-temperature thermal stability and hardness, promising applications to industries at extreme operating environments. The aim of this paper is continuum plasticity model accounting for the first time behaviour equiatomic five-element CSA, that forms face-centred cubic inherent disorder associated lattice distortions caused by an almost distribution atoms, captured single parameter α quantifies relative importance isotropic plastic contribution model. This results mechanisms go beyond crystallographic symmetry-based ones, common case conventional element metals. We perform molecular dynamics simulations CSAs: NiFe, NiFeCr, NiFeCrCo, Cantor validate proposed which implemented finite method applied nanoindentation tests three orientations. obtain representative volume tracking combined yield surface.