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Dislocation and defect density based modeling of deformation behavior of irradiated fcc polycrystals

By Anand Kanjarla (Indian Institute of Technology Madras)
Co-authors: Aaditya Lakshmanan (IITM)
Darshan Chalapathi (IITM)

Increased yield stress, limited ductility and work softening are often observed in mechanical behavior of irradiated polycrystalline materials. These phenomena are consequence of the presence and interaction between the various kinds of irradiation induced crystal defects such as vacancies, interstitials, prismatic loops and stacking fault tetrahedrons (SFT) along with defects such as dislocations that are introduced due to prior processing of the components. In this talk, we present a slip system based model, within a crystal plasticity framework, that accounts for interactions between the two types of defects: dislocations and the SFTs. The dislocation-density evolution is modeled using the Kocks-Mecking approach. The dislocation-SFT interaction density is modeled in the form of an anisotropic defect density tensor capable of capturing the crystallography of the SFTs. The model is tested on FCC single crystals and polycrystals to capture increased yield stress, subsequent softening and their correlation to inelastic deformation localization. Detailed discussion on the various assumptions made in the current model and their implications on the predicted mechanical behavior are also discussed.

Ⓒ Photos:Toerisme Leuven