Nonlinear Migration of Faceted Boundaries and Nonstationary Grain Growth in Ceramics

Abstract:

Recent investigations suggest that general grain boundaries can be categorized into two types: rough (atomically disordered) and faceted (atomically ordered). This paper reports our recent investigations on the migration behaviour of faceted boundaries and its effect on grain growth in polycrystalline ceramics. A model experiment has been performed using bi-layer samples of polycrystals with different average grain sizes and single crystals of BaTiO₃ to study the migration behaviour of faceted boundaries. A non-linear relationship between grain boundary migration and the driving force for migration is revealed. Grain growth behaviour with respect to boundary faceting has also been studied in perovskites. The structural transition of boundaries between rough and faceted can be induced by changing oxygen partial pressure, adding dopants and changing temperature. The fraction of faceted boundaries was changed by changing oxygen partial pressure and donor doping. As the facet fraction decreased, the grain growth behaviour changed from stagnant and abnormal to normal. The different types of growth behaviour observed can be explained by the coupling effect of the maximum driving force for the boundary migration and the critical driving force for appreciable migration of faceted boundaries.

• Periodical: Materials Science Forum (Volumes 715-716)
• Pages: 719-724
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.715-716.719
• Online since: April 2012
• Authors: John G. Fisher, Suk Joong L. Kang
• Keywords: Grain Boundary, Microstructure, Nonstationary Grain Growth

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DOI: 10.1016/b978-075066385-4/50015-7

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