Study of energy vs misorientation for grain boundaries in gold by crystallite rotation method - I. (001) twist boundaries
Small gold crystallites ( about50-80 nm dia) were welded to thin film (001) single crystal gol substrates at a series of predetermined (001) twist angles in the range 0.45/sup 0/. A pure (001) twist boundary therefore existed in each welded neck region which could be observed directly by transmission electron microscopy at normal incidence. Upon annealing, the crystallites rotated around (001) when the boundary energy varied with theta. The crystallites rotated into three misorientations corresponding to the special ..sigma..1 and ..sigma..5 misorientations and a symmetry related misorientation at theta = 45/sup 0/. These results indicate the existence of grain boundary dislocation (GBD) related cusps on the boundary energy vs theta curve a ..sigma..1 and ..sigma..5. The rotations occurred conservatively by the motion of screw GBDs which could be observed directly by the transmission microscopy in certain regimes of theta. The results are relevant to recent calculations of the energies of (001) twist boundaries and the applicability of the GBD/structural unit model for grain boundaries.
- Research Organization:
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA
- OSTI ID:
- 6395389
- Journal Information:
- Acta Metall.; (United States), Vol. 33:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GOLD
ENERGY SPECTRA
GRAIN BOUNDARIES
GRAIN ORIENTATION
ANNEALING
CRYSTALLOGRAPHY
DISLOCATIONS
SUBSTRATES
SYMMETRY
TRANSMISSION ELECTRON MICROSCOPY
WELDING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
ELEMENTS
FABRICATION
HEAT TREATMENTS
JOINING
LINE DEFECTS
METALS
MICROSCOPY
MICROSTRUCTURE
ORIENTATION
SPECTRA
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies