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Computer Simulation Model for Coupled Grain Growth and Ostwald Ripening—Application to Al 2 O 3 ‐ZrO 2 Two‐Phase Systems
Author(s) -
Chen LongQing,
Fan Danan
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08568.x
Subject(s) - ostwald ripening , thermodynamics , materials science , microstructure , grain growth , phase field models , volume fraction , phase (matter) , ginzburg–landau theory , kinetic energy , grain size , mineralogy , chemical physics , statistical physics , chemistry , condensed matter physics , metallurgy , physics , classical mechanics , superconductivity , organic chemistry
A kinetic model based on generalized continuum time‐dependent Ginzburg‐Landau (TDGL) equations is proposed for studying coupled grain growth and Ostwald ripening in multiphase systems. In this model, an arbitrary multiphase microstructure is described by many orientation field variables which represent crystallographic orientations of grains in each phase and by n — 1 composition field variables which distinguish the compositional differences among n phases. Microstructural development during simultaneous grain growth and Ostwald ripening is predicted by the temporal evolution of these field variables by numerically solving the TDGL equations. A particular example, Al 2 O 3 ‐ZrO 2 particulate composite, was considered. The effects of the volume fraction of ZrO 2 on the microstructural features and their evolution were studied and compared to experimental observations and previous thermodynamic analysis.