Abstract
Microstructure evolution in complex nonlinear systems is of great interest from both scientific and engineering viewpoints. Here, we consider an important case of such an evolution, a coherent decomposition of a homogeneous parent phase involving the symmetry-lifting crystal lattice rearrangement of the product phase. It is shown that under certain conditions the transformation develops as a pseudospinodal decomposition, which is defined as a transformation with continuous changes of the compositions of both decomposed phases towards their equilibrium values. The pseudospinodal decomposition starts by the formation of a nanodomain precursor state with a so-called tweed structure. The three-dimensional modelling demonstrates that this tweed structure has an underlying chessboard feature, and this arrangement is a template for the further microstructure development that eventually produces a coherent two-phase chessboard nanowire pattern. The proposed theory and modelling describe the mechanism of the pseudospinodal decomposition and predict all observed three-dimensional features of the chessboard structure.
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Acknowledgements
The authors gratefully acknowledge the support from NSF DMR under the grant NSF DMR-0704045. The simulations were performed on the DataStar in the San Diego Supercomputer Centre.
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Y.N. carried out most of the analysis and simulation in the research. A.G.K. planned the research and supervized it. The article was written by A.G.K. and Y.N.
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Ni, Y., Khachaturyan, A. From chessboard tweed to chessboard nanowire structure during pseudospinodal decomposition. Nature Mater 8, 410–414 (2009). https://doi.org/10.1038/nmat2431
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DOI: https://doi.org/10.1038/nmat2431
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