Discrete model for diffusion-induced grain boundary deterioration

Andrey Jivkov, John R. Yates, Pavel Sandera (Editor), Jaroslav Pokluda (Editor)

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    Abstract

    Polycrystalline materials may suffer internal damage due to diffusion of chemically aggressive species during service. Diffusion rates are greatly enhanced on grain boundaries (GB). This can be modelled with discrete networks, where the GB structure is represented by links with local diffusivities. We present a site-bond model for concentration-driven diffusion that can be used to study the accumulation of chemical species at GB, leading to deterioration and eventual cracking. We employ realistic distributions of GB energies and corresponding diffusivities from published works. We show how the model can be used to predict macroscopic diffusivities with little experimentation. We demonstrate how the grain boundary structure controls the extent of internal damage resulting from the diffusion of chemical species.
    Original languageEnglish
    Title of host publicationMSMF7
    EditorsPavel Sandera, Jaroslav Pokluda
    Pages1-4
    Number of pages4
    Publication statusPublished - 1 Jul 2013
    Event7th Int Conf on Materials Structure & Micromechanics of Fracture - Brno, Czech Republic.
    Duration: 1 Jul 20133 Jul 2013

    Conference

    Conference7th Int Conf on Materials Structure & Micromechanics of Fracture
    CityBrno, Czech Republic.
    Period1/07/133/07/13

    Keywords

    • polycrystalline materials
    • grain boundary network
    • local diffusivity
    • discrete analysis
    • boundary cracking

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