DSpace
 

RRI Digital Repository >
07. Theoretical Physics >
Research Papers (TP) >

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4074

Title: Early-time particle dynamics and non-affine deformations during microstructure selection in solids
Authors: Sengupta, Surajit
Rao, Madan
Bhattacharya, Jayee
Keywords: Glass-Transition
Metallic Glasses
Disorder
State
Flow
Issue Date: Jul-2011
Publisher: IOP Publishing Ltd.
Citation: Journal of Physics: Condensed Matter, 2011, Vol.23, p295402
Abstract: Solid–solid transitions are invariably associated with groups of particles whose deformations cannot be expressed as an affine strain about a reference configuration. The dynamics of these non-affine zones (NAZ) determine the subsequent microstructure, i.e. the mesoscale patterning resulting from the structural transition. Here, we focus on early-time dynamics of individual particles within an NAZ associated with a nucleation event. We show that the early-time behavior of these particles have distinctive characteristics depending on the transition temperature. The dynamics is heterogeneous, consisting of a few active particles exhibiting complex intermittent jamming and flow in response to internal stresses generated during the transformation. At low temperatures, the dynamics of these active particles is ballistic and the structural transformation proceeds via string-like correlated movement of active particles, along ridges in the potential energy topography set up by inactive particles. On increasing temperature, the dynamics of active particles show an abrupt transition from ballistic to diffusive behavior with a diffusion coefficient which appears to be independent of temperature. This dynamical transition in the nature of the trajectories of particles is coincident with a discontinuous transition in the microstructure of the solid. Finally, we characterize this transition in terms of a dynamical order parameter in the space of trajectories and discuss its connection with the glass transition and rheology of soft and granular matter.
Description: Restricted Access.
URI: http://hdl.handle.net/2289/4074
ISSN: 0953-8984
1361-648X (Online)
Alternative Location: http://dx.doi.org/10.1088/0953-8984/23/29/295402
http://adsabs.harvard.edu/abs/2011JPCM...23C5402S
Copyright: 2011 IOP Publishing Ltd.
Appears in Collections:Research Papers (TP)

Files in This Item:

File Description SizeFormat
2011_JPCM_23_295402.pdfRestricted access630.33 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

    RRI Library DSpace