Evolution of multivariant microstructures with anisotropic misfit: A phase field study
| Autor: | Saswata Bhattacharyya, T.A. Abinandanan |
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| Rok vydání: | 2009 |
| Předmět: |
business.product_category
Materials science Polymers and Plastics Condensed matter physics Field (physics) Metals and Alloys Materials Engineering (formerly Metallurgy) Phase field models Pure shear Microstructure Wedge (mechanical device) Physics::Geophysics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Crystallography Phase (matter) Ceramics and Composites Tensor Anisotropy business |
| Zdroj: | Acta Materialia. 57:646-656 |
| ISSN: | 1359-6454 |
| Popis: | We study, in two dimensions, the effect of misfit anisotropy on microstructural evolution during precipitation of an ordered beta phase from a disordered alpha matrix; these phases have, respectively, 2- and 6-fold rotation symmetries. Thus, precipitation produces three orientational variants of beta phase particles, and they have an anisotropic (and crystallographically equivalent) misfit strain with the matrix. The anisotropy in misfit is characterized using a parameter t = epsilon(yy)/epsilon(xx), where epsilon(xx) and epsilon(yy) are the principal components of the misfit strain tensor. Our phase field, simulations show that the morphology of beta phase particles is significantly influenced by 1, the level of misfit anisotropy. Particles are circular in systems with dilatational misfit (t = 1), elongated along the direction of lower principal misfit when 0 < t < 1 and elongated along the invariant direction when - 1 |
| Databáze: | OpenAIRE |
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