Please use this identifier to cite or link to this item:
http://hdl.handle.net/2289/3208
Title: | Statistical mechanics of nucleation in solids: a kinetics driven morphological transition |
Authors: | Sengupta, Surajit Rao, Madan |
Keywords: | Solid–solid transitions Phase diagrams and microstructures Nucleation |
Issue Date: | Feb-2003 |
Publisher: | Elsevier B.V. |
Citation: | Physica A: Statistical Mechanics and its Applications, 2003, Vol.318, 251-261 |
Abstract: | We examine in detail, through extensive molecular dynamics simulations, the process of nucleation of a triangular phase in a model two-dimensional square crystal consisting of particles interacting via a pair and three-body potentials. We find that at high temperatures, the critical nucleus of the triangular phase is isotropic with local triangular order. At low temperatures, the critical nucleus consists of a twinned bicrystal which is anisotropic and breaks the symmetry of the underlying square phase. We show that this morphological transition is caused by the dynamics of non-elastic degrees of freedom, viz. interfacial defect fields. This transition is similar to that between ‘ferrite’ and ‘martensite’ as observed in real materials when a solid such as iron is cooled across a structural transition. Based on our simulation results, we arrive at a single theoretical formalism which qualitatively describes the transformation to both a ferrite and a martensite. |
Description: | Restricted Access. |
URI: | http://hdl.handle.net/2289/3208 |
ISSN: | 0378-4371 |
Alternative Location: | http://dx.doi.org/10.1016/S0378-4371(02)01427-9 |
Copyright: | 2003 Elsevier B.V. |
Appears in Collections: | Research Papers (TP) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
2003 Physica-A V318 p251.pdf Restricted Access | Restricted Access | 262.22 kB | Adobe PDF | View/Open Request a copy |
Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.