  In this work, molecular dynamics (MD) simulations were used to investigate
elementary dislocation properties in a Co-free high entropy (HEA) model alloy
($Cr_{15}Fe_{46}Mn_{17}Ni_{22}$ at. %) in comparison with a model alloy
representative of Austenitic Stainless Steel (ASS) ($Cr_{20}Fe_{70}Ni_{10}$ at.
%). Recently developed embedded-atom method (EAM) potentials were used to
describe the atomic interactions in the alloys. Molecular Statics (MS)
calculations were used to study the dislocation properties in terms of local
stacking fault energy (SFE), dissociation distance while MD was used to
investigate the dissociation distance under applied shear stress as a function
of temperature and strain rate. It was shown that higher critical stress is
required to move dislocations in the HEA alloy compared with the ASS model
alloy. The theoretical investigation of simulation results of the dislocation
mobility shows that a simple constitutive mobility law allows to predict
dislocation velocity in both alloys over three orders of magnitude, covering
the phonon drag regime and the thermally activated regime induced by
dislocation unpinning from local hard configurations.
