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Coherency Strain Energy and the Direction of Chemically Induced Grain Boundary Migration in Al 2 O 3 –Cr 2 O 3 and Al 2 O 3 –Fe 2 O 3
Author(s) -
Lee Ho Yong,
Kang SukJoong L.,
Yoon Duk Yong
Publication year - 1994
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.1151-2916.1994.tb05406.x
Subject(s) - grain boundary , zigzag , strain (injury) , materials science , strain energy , crystallography , orientation (vector space) , condensed matter physics , surface energy , mineralogy , geometry , composite material , chemistry , thermodynamics , microstructure , physics , medicine , mathematics , finite element method
Using various pairs of Al 2 O 3 crystals of known surface orientation and two solute species of Cr 2 O 3 and Fe 2 O 3 , the direction of chemically induced grain boundary migration has been investigated on the basis of a calculation of coherency strain energy. For all the grain boundaries studied, the chemically induced migration always occurred in the direction of the grain with the surface orientation corresponding to higher coherency strain energy. The migration directions of some grain boundaries were different depending on the solute species because of different strain energy for the same orientation. The zigzag migration was also observed but only in grain boundaries between grains whose coherency strain energies were comparable to each other. These observations have confirmed the prediction of the migration initiation by the coherency strain theory.