Observation of a grain boundary phase transformation induced by solute segregation
Comparisons were made of the defect structures present in low angle Fe twist boundaries in the absence and in the presence of Au solute. Samples for this study were prepared by sintering together epitaxial Fe--Au dilute alloy thin films, grown by electron beam vapor deposition. Rutherford backscattering spectrometry (RBS) measurements showed that the Au solute was concentrated in the vicinity of the grain boundaries in this study. Transmission electron microscopy observations showed that the Au solute segregated at the boundary induces a transformation in the grain boundary dislocation (GBD) structure from a <110>-oriented GBD network, to a <100>-oriented GBD network. Analytical electron microscopy showed that the grain boundary regions containing the <100>-GBD networks were substantially richer in Au than the regions containing the <110>-GBD networks. These results are evidence for the occurrence of a two-dimensional phase transformation at the grain boundary.
- Research Organization:
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853
- OSTI ID:
- 5673485
- Journal Information:
- J. Vac. Sci. Technol., A; (United States), Journal Name: J. Vac. Sci. Technol., A; (United States) Vol. 3:3; ISSN JVTAD
- Country of Publication:
- United States
- Language:
- English
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Observations of a grain boundary phase transformation induced by solute segregation
Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
BACKSCATTERING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELECTRON MICROSCOPY
ELEMENTS
EPITAXY
FABRICATION
GOLD
GOLD ALLOYS
GRAIN BOUNDARIES
IRON
IRON ALLOYS
LINE DEFECTS
METALS
MICROSCOPY
MICROSTRUCTURE
PHASE TRANSFORMATIONS
SCATTERING
SEGREGATION
SINTERING
SOLUTES
SOLVENT PROPERTIES
TRANSITION ELEMENTS
TRANSMISSION ELECTRON MICROSCOPY