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Dislocations in symmetric high angle [001] tilt boundaries in gold
Author(s) -
Schober T.,
Balluffi R. W.
Publication year - 1971
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220440111
Subject(s) - misorientation , grain boundary , materials science , tilt (camera) , condensed matter physics , geometry , crystallography , annealing (glass) , microstructure , physics , composite material , chemistry , mathematics
The structure of high angle tilt boundaries possessing small tilt deviations (i.e., 1 to 2°) from various special high coincidence site density tilt misorientations was studied by transmission electron microscopy. The latter misorientations corresponded to rotations of θ c = 22.6, 28.1, 36.9, 53.1, 61.9, 67.4, and 73.7° around [001]. The grain boundary planes were of the symmetric type, and the tilt deviations from the high coincidence site density misorientations were around various axes lying in the grain boundary planes. The boundaries were examined at normal incidence in bicrystals prepared by welding single crystal thin films together face‐to‐face at predetermined misorientations and also edge‐on in polycrystals obtained by the annealing of welded bicrystals initially containing only twist boundaries. Arrays of parallel dislocations were found in a number of boundaries which appeared to be in good agreement with the structures predicted by use of Bollmann's analysis of the geometry of dislocations in high angle grain boundaries. It is therefore concluded that the structure of such high angle boundaries consists of an array of evenly spaced edge dislocations (or possibly close pairs of dislocations in certain cases) running parallel to the tilt deviation axis embedded in the interface corresponding to the nearby high coincidence site density misorientation. It seems likely that such structures exist over wider ranges of misorientation than were investigated experimentally.