Superplastic properties of an aluminum alloy, AA7475 were studied experimentally and simulated by a micromechanically based phenomenological model. The superplastic behavior was studied and predicted at different strain rate and temperature. The model assumes that the total deformation is the result of a composite interaction of grain boundary sliding accommodated by matrix deformation (dislocation climb and glide). Hart's constitutive equations for inelastic deformation of polycrystalline materials are used to represent matrix deformation. The grain boundary sliding is represented through a linear viscous equation originally proposed by Ashby-Verrall. The analysis shows that the Hart's model for high temperature climb processes together with grain boundary sliding can predict the superplastic deformation from the very low to moderately high strain rates.


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    Titel :

    A Unified Phenomenological Model for Superplastic Materials


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Li, Dongsheng (Autor:in) / Garmestani, Hamid (Autor:in)

    Kongress:

    SAE World Congress & Exhibition ; 2008



    Erscheinungsdatum :

    14.04.2008




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    A unified phenomenological model for superplastic materials

    Garmestani,H. / Li,D. / Georgia Institute of Technology,US | Kraftfahrwesen | 2008


    Phenomenological Modeling of Superplastic Al 7475

    Booeshaghi, F. / Garmestani, H. / Kalu, P. N. et al. | British Library Conference Proceedings | 1997



    Superplastic Forming of Aerospace Materials

    Padmanabhan, K. A. / Balasivanandha Prabu, S. / Madhavan, S. | Springer Verlag | 2016


    Superplastic Alloys

    Emerald Group Publishing | 1976