Boundary Structure-Dependent Grain Growth Behavior in Polycrystals: Model and Principle

Abstract:

This paper reviews our recent investigations on grain growth in ceramics. Grain growth behavior has been found to be governed by the grain boundary structure: normal growth with a stationary relative grain size distribution for rough boundaries and non-normal (nonstationary) growth for faceted boundaries. Based on the concept of nonlinear migration of faceted boundaries, the mixed control model of grain growth is introduced and the principle of microstructural evolution is deduced. This principle states that various types of grain growth behavior are predicted as a result of the coupling effect between the maximum driving force for growth and the critical driving force for appreciable migration of the boundary. A wealth of experimental results supports the theoretical predictions of grain growth behavior, showing the generality of the suggested principle of microstructural evolution. Application of this principle is also demonstrated for the fabrication of single crystals as well as polycrystals with desired microstructures.

• Periodical: Materials Science Forum (Volume 753)
• Pages: 377-382
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.753.377
• Online since: March 2013
• Authors: Suk Joong L. Kang
• Keywords: Abnormal Grain Growth, Grain Boundary Migration, Grain Boundary Structure, Grain Growth Model, Microstructural Evolution, Nonstationary Grain Growth

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