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

Ganguly, Saswati; Mohanty, Priti S. LU ; Schurtenberger, Peter LU ; Sengupta, Surajit and Yethiraj, Anand (2017) In Soft Matter 13(27). p.4689-4697
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... (More)

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.

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author
organization
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type
Contribution to journal
publication status
published
subject
in
Soft Matter
volume
13
issue
27
pages
9 pages
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85023781774
  • wos:000405432700003
ISSN
1744-683X
DOI
10.1039/c7sm00623c
language
English
LU publication?
yes
id
5e70cee2-cf03-417c-bb96-c8b83ded7d8d
date added to LUP
2017-07-27 14:43:51
date last changed
2018-08-26 04:57:13
@article{5e70cee2-cf03-417c-bb96-c8b83ded7d8d,
  abstract     = {<p>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.</p>},
  author       = {Ganguly, Saswati and Mohanty, Priti S. and Schurtenberger, Peter and Sengupta, Surajit and Yethiraj, Anand},
  issn         = {1744-683X},
  language     = {eng},
  number       = {27},
  pages        = {4689--4697},
  publisher    = {Royal Society of Chemistry},
  series       = {Soft Matter},
  title        = {Contrasting the dynamics of elastic and non-elastic deformations across an experimental colloidal Martensitic transition},
  url          = {http://dx.doi.org/10.1039/c7sm00623c},
  volume       = {13},
  year         = {2017},
}