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Revealing the micromechanisms behind semi-solid metal deformation with time-resolved X-ray tomography

Author

Listed:
  • K. M. Kareh

    (Imperial College London)

  • P. D. Lee

    (School of Materials, The University of Manchester)

  • R. C. Atwood

    (Diamond Light Source Ltd, Harwell Science & Innovation campus)

  • T. Connolley

    (Diamond Light Source Ltd, Harwell Science & Innovation campus)

  • C. M. Gourlay

    (Imperial College London)

Abstract

The behaviour of granular solid–liquid mixtures is key when deforming a wide range of materials from cornstarch slurries to soils, rock and magma flows. Here we demonstrate that treating semi-solid alloys as a granular fluid is critical to understanding flow behaviour and defect formation during casting. Using synchrotron X-ray tomography, we directly measure the discrete grain response during uniaxial compression. We show that the stress–strain response at 64–93% solid is due to the shear-induced dilation of discrete rearranging grains. This leads to the counter-intuitive result that, in unfed samples, compression can open internal pores and draw the free surface into the liquid, resulting in cracking. A soil mechanics approach shows that, irrespective of initial solid fraction, the solid packing density moves towards a constant value during deformation, consistent with the existence of a critical state in mushy alloys analogous to soils.

Suggested Citation

  • K. M. Kareh & P. D. Lee & R. C. Atwood & T. Connolley & C. M. Gourlay, 2014. "Revealing the micromechanisms behind semi-solid metal deformation with time-resolved X-ray tomography," Nature Communications, Nature, vol. 5(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5464
    DOI: 10.1038/ncomms5464
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    Cited by:

    1. Ma, Lin & Fauchille, Anne-Laure & Chandler, Michael R. & Dowey, Patrick & Taylor, Kevin G. & Mecklenburgh, Julian & Lee, Peter D., 2021. "In-situ synchrotron characterisation of fracture initiation and propagation in shales during indentation," Energy, Elsevier, vol. 215(PB).

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