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Origins of Planar, Concave, and Convex Boundaries During Exaggerated Grain Growth
Author(s) -
Searcy Alan W.
Publication year - 1986
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.1151-2916.1986.tb04776.x
Subject(s) - nucleation , grain boundary , planar , grain growth , materials science , regular polygon , grain boundary strengthening , dislocation , condensed matter physics , geometry , crystallography , grain size , mathematics , chemistry , thermodynamics , composite material , physics , microstructure , computer graphics (images) , computer science
A new surface thermodynamic theory is used to show that exaggerated grain growth is driven by reductions in grain boundary and dislocation free energies produced when a larger grain sweeps out a volume element formerly occupied by small grains. Whether the advancing boundary is planar, concave, or convex depends on the relative rates of ledge nucleation and growth, on the growth direction, and on whether growth occurs at screw dislocations.