Assessment of vacancy migration energy in a ternary austenitic steel Fe–Cr-Ni with 16% chromium and 20% nickel composition, using kinetic Monte Carlo method, considering an ordering model via vacancy diffusion mechanism

The enthalpy of thermal vacancy migration in Iron-Chromium-Nickel stainless steel of F.C.C structure, containing 16% chromium and 20% nickel, was determined by kinetic M.C simulation, considering a model of ordering by a vacancy mechanism. The curves of electrical resistivity variation corresponding to S.R.O variations are calculated as a function of time at T₀^’ = 700°Kelvin and T₁^’’ = 800°Kelvin temperatures. The analysis of these graphs showing changes in electrical resistivity due to local ordering allowed us to evaluate the enthalpy of vacancy migration in the alloy studied in this work, using the change-in-slope technique [1,2]. The enthalpy of vacancy migration was found to be equal to: \({\Delta H}_{V}^{M}\) ${\mathrm{\Delta }H}_V^M$ = (0.77 ± 0.097) eV.