Theoretical and experimental study of the isothermal mechanical behaviour of alloys in the semi-solid state |
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| Institution: | 1. School of Physics & Astronomy, University of Leeds, Leeds LS2 9JT, UK;2. Institute for Protein Research, Osaka University, 3-2 Yamadoaka, Suita, Osaka 565-0871, Japan;3. School of Mathematics, University of Leeds, Leeds LS2 9JT, UK;4. Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, UK;1. School of Chemistry and Biochemistry, Thapar Institute of Engineering and Technology, Bhadson Road, Patiala, 147004, Punjab, India;2. Department of Chemical Engineering, Dr. B.R. Ambedkar National Institute of Technology, Jalandhar, Jalandhar, 144011, Punjab, India;3. Department of Chemistry, Aristotle University of Thessaloniki, P.O. Box 454 Plagiari Thes., 57500 Epanomi, Greece |
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| Abstract: | An isothermal constitutive model for semi-solid alloys based on the concepts of mechanics of continuous media and the theory of mixtures is presented. The model is applicable to semi-solid states obtained either by solidification from liquid state or partial remelting from solid state in which each of the solid and the liquid phases is contiguous. During deformation their behaviours are coupled: the densification of the solid matrix considered as a porous viscoplastic medium saturated with a liquid drives the fluid flow behaviour, and the resulting pressure distribution in the liquid affects in turn the stresses and the densification of the solid. The identification procedure of the model uses two types of mechanical tests: uniaxial compression and drained die pressing (filtration) carried out with A356 alloy. The identification results are then validated using drained triaxial compression. |
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