Coarsening dynamics of self-accommodating coherent patterns |
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| Affiliation: | 1. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA;2. Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA;1. Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, TX, USA;2. Department of Civil and Environmental Engineering, The University of Texas at San Antonio, San Antonio, TX, USA;1. National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 200240 Shanghai, PR China;2. Jiangxi Ganfeng Lithium Co., Ltd, 338004 Xinyu, Jiangxi, PR China;1. School of Mechanical and Materials Engineering, University College Dublin, Ireland;2. Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK |
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| Abstract: | The coarsening kinetics of self-accommodating coherent domain structures is investigated using computer simulations based on a continuum phase-field model. The domain structures are produced from coherent hexagonal to orthorhombic phase transformations. It is found that the long-range elastic interactions arising from the lattice accommodation among different orientation domains of the orthorhombic phase dominate the domain morphologies and the kinetics of domain coarsening. It is shown that the long-range elastic interactions result in several new features for the domain coarsening as compared to normal grain growth. For example, the domain growth rate is reduced significantly and the growth exponent becomes a function of the relative contribution of the elastic energy reduction to the total driving force. In general, the elastic interaction is in favor of fine domains. Although triple junctions are dominant in the microstructure, a significant amount of quadrojunctions exist throughout the domain coarsening process. The average number of sides of the domain is also reduced. |
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