Formation of oxide nanoclusters in nanostructured ferritic alloys during anisothermal heat treatment: A kinetic Monte Carlo study

摘要

Kinetic Monte Carlo simulations, based on rigid lattice approximation, have been performed to study the homogeneous precipitation in Fe-Y-O and Fe-Ti-O alloys during anisothermal heat treatments. Simulations predict different kinetic behaviors, including transient precipitation of metastable iron oxides followed by precipitation of Y_2O_3 or Ti_2O_3 nanoclusters. Then, precipitation kinetics in ternary alloys are compared. Significant differences in the precipitation behaviour of Y_2O_3 and Ti_2O_3 were observed as result of dramatically different diffusion rates of Y and Ti atoms.