Dimension Reduction of Irradiation-Induced Defect Properties for Application in 2D Dislocation Dynamics
Ilker Topuz (Materials Innovation Institute & University of Groningen), Erik Van der Giessen (University of Groningen)
Materials for Extreme Environments: Multiscale Experiments and Simulations
Mon 9:00 - 10:30
Salomon 203
While real microstructures are obviously three dimensional, dislocation dynamics simulations of polycrystalline samples in 3D are not likely to become widely available in the near future (apart from the fact that such computations would require a tremendous amount of input information). In contrast, recent progress has demonstrated that 2D discrete dislocation plasticity can have quantitative predictability, provided the model is carefully tuned to capture the dominant physics. Moreover, fracture studies are predominantly 2D in nature. With the purpose of modelling the effect of irradiation on the plastic response of polycrystalline metals, we here present a framework to transfer (experimental) knowledge of the 3D defect structure into a 2D model. Irradiation-induced defects include Stacking fault Tetrahedra (SFT), Frank loops and voids, while irradiation is also known to lead to evolution of precipitates. Our approach aims at transforming, for each defect type, information about the 3D defect density and size into the density and strength of point obstacles to be used in 2D dislocation dynamics. The procedure is illustrated for polycrystalline copper and alloys.