Modeling microstructure evolution of binary systems subjected to irradiation and mechanical loading

Abstract

We study a change in mechanical properties of binary systems subjected to irradiation influence described by ballistic flux of atomic mixing having regular and stochastic contributions. By using numerical modeling based on the phase field approach we study dynamics of deformation fields in a previously irradiated system and in the binary system deformed during irradiation. An influence of both deterministic and stochastic components of ballistic flux onto both yield strength and ultimate strength is studied. We have found that degradation of mechanical properties relates to the formation of percolating clusters of shear bands. Considering a hardening coefficient we analyze stages of plastic deformation of both initially irradiated alloy and alloy subjected to sustained irradiation. Stability of binary alloy under mechanical loading in the form of shear strain with a constant rate and cyclic deformation is discussed.

Phase field modelling voids nucleation and growth in binary systems

“…Some hybrid approaches can be used to study fundamental mechanisms governing the microstructure evolution by combining several methods working correctly at least on two time and length scales. Among them one can point out a phase field method based on Allen-Cahn and Cahn-Hilliard approaches [33][34][35] allowing one to monitor phase transitions [36], precipitation [37], patterning [38], voids formation [39][40][41], as well as a change in mechanical properties at irradiation [42].…”