期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 61, 期 6, 页码 1433-1445出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2013.01.012
关键词
Morphological transformation; Particle splitting; Equilibrium shape; Extended finite element method; Level set method
资金
- NSF [CMMI-1200075]
- European Research Council Starting Independent Research Grant (ERC Stg grant) [279578]
- EPSRC [EP/G042705/1]
This paper presents an efficient sharp interface model to study the morphological transformations of misfit particles in phase separated alloys. Both the elastic anisotropy and interfacial energy are considered. The geometry of the material interface is implicitly described by the level set method so that the complex morphological transformation of microstructures can be accurately captured. A smoothed extended finite element method is adopted to evaluate the elastic field without requiring remeshing. The equilibrium morphologies of particles are shown to depend on the elastic anisotropy, interfacial energy as well as the particle size. Various morphological transformations, such as shape changes from spheres to cuboids, directional aligned platelets and particle splitting, are observed. The simulated results are in good agreement with experimental observations. The proposed model provides a useful tool in understanding the morphological transformation of precipitates, which will facilitate the analysis and design of metallic alloys. (C) 2013 Elsevier Ltd. All rights reserved.
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