An Influence of the Composition and Annealing Tempera-ture onto Microstructure and Mechanical Properties of Fe–Cr–Al Alloys

A generalized model of the phase field is developed for modelling the dynam-ics of microstructural transformations in iron-based Fe–Cr–Al alloys by tak-ing into account the dynamics of equilibrium point defects. Dynamics of the processes of formation and growth of chromium-enriched precipitates of α′-phase during long-term annealing of solid solution is studied. An influence of both the concentration of alloying elements and the annealing temperature on the dynamic and statistical characteristics of the growing precipitates is analysed. The scaling dynamics of the average size of precipitates, their number as well as the universality of size distribution are shown. A redistri-bution of elastic stresses under mechanical loading in the form of shear de-formation is investigated within the framework of the nonlinear theory of elasticity. The influence of both the composition and the annealing tempera-ture on the mechanical properties of the alloy is analysed.