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Issue 27, 2017
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Contrasting the dynamics of elastic and non-elastic deformations across an experimental colloidal Martensitic transition

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Abstract

We present a framework to segregate the roles of elastic and non-elastic deformations in the examination of real-space experiments of solid–solid Martensitic transitions. The Martensitic transformation of a body-centred-tetragonal (BCT) to a body-centred-orthorhombic (BCO) crystal structure has been studied in a model system of micron-scale ionic microgel colloids (P. S. Mohanty, P. Bagheri, S. Nöjd, A. Yethiraj and P. Schurtenberger, Phys. Rev. X, 2015, 5, 011030). Non-affine fluctuations, i.e., displacement fluctuations that do not arise from purely elastic (affine) deformations, are detected in particle configurations acquired from the experiment. Tracking these fluctuations serves as a highly sensitive tool in signaling the onset of the Martensitic transition and precisely locating particle rearrangements occurring at length scales of a few particle diameters. Particle rearrangements associated with non-affine displacement modes become increasingly favorable during the transformation process. The nature of the displacement fluctuation modes that govern the transformation are shown to be different from those predominant in an equilibrium crystal. We show that BCO crystallites formed through shear may, remarkably, co-exist with those resulting from local rearrangements within the same sample.

Graphical abstract: Contrasting the dynamics of elastic and non-elastic deformations across an experimental colloidal Martensitic transition

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Publication details

The article was received on 28 Mar 2017, accepted on 04 Jun 2017 and first published on 08 Jun 2017


Article type: Paper
DOI: 10.1039/C7SM00623C
Citation: Soft Matter, 2017,13, 4689-4697
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    Contrasting the dynamics of elastic and non-elastic deformations across an experimental colloidal Martensitic transition

    S. Ganguly, P. S. Mohanty, P. Schurtenberger, S. Sengupta and A. Yethiraj, Soft Matter, 2017, 13, 4689
    DOI: 10.1039/C7SM00623C

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