Multiscale models of metal behaviour and structural change under the action of high-current electron irradiation

5th International Congress on Energy Fluxes and Radiation Effects 2016

Mayer, A.E.^1 ; Krasnikov, V.S.^1 ; Mayer, P.N.^1 ; Pogorelko, V.V.^1

Department of Physics, Chelyabinsk State University, Bratiev Kashirinykh Street 129, Chelyabinsk

454001, Russia^1

关键词: Atomistic simulations;    Continuum Modeling;    Defects evolution;    High current electron beams;    Irradiated materials;    Macroscopic scale;    Multiscale models;    Structural defect;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/830/1/012072/pdf
DOI  :  10.1088/1742-6596/830/1/012072

来源: IOP

【 摘 要 】

We present our models of the tensile fracture of metals in the solid and molten states, the melting and the plastic deformation of the solid metals. Also we discuss implementation of these models for simulation of the high current electron beam impact on metals. The models are constructed in the following way: the atomistic simulations are used at the first stage for investigation of dynamics and kinetics of structural defects in material (voids, dislocations, melting cites); equations describing evolution of such defects are constructed, verified, and their parameters are identified by means of comparison with the atomistic simulation result; finally, the defects evolution equations are incorporated into the continuum model of the substance behaviour on the macroscopic scale. The obtained continuum models with accounting of defects subsystems are tested in comparison with the experimental results known from literature. The proposed models not only allow one to describe the metal behaviour under the conditions of intensive electron irradiation, but they also allow one to determine the structural changes in the irradiated material.