Observation of the effect of solute segregation on grain boundary structure
It is frequently observed that solute atoms segregate to grain boundaries in alloy systems where there is limited solubility in the solid solution. Auger spectroscopy has shown the presence of typically up to a monolayer of solute at internal interfaces in such systems. The practical consequence of such segregation is frequently the embrittlement of the grain boundary region, making it susceptible to fracture at relatively low stresses. It is of considerable interest to learn how the presence of the solute changes the mechanical properties of the boundary. Is the solute changing the chemical bonding across the interface as suggested by Messmer and Briant or is it changing the atomic structure, or perhaps both. In this paper an experiment is described which addresses the question of whether the presence of solute at the boundary influences the structure of the boundary. It is shown that in a small angle (001) twist boundary in the Fe-Au system, a small amount of Au causes a major change i the dislocation structure of the interface. These observations are evidence for the occurrence of a two dimensional phase transformation in the grain boundary.
- Research Organization:
- Department of Materials Science and Engineering, Cornell University, Ithaca, New York
- OSTI ID:
- 6270897
- Journal Information:
- Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 18:2; ISSN SCRMB
- Country of Publication:
- United States
- Language:
- English
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Observation of the effect of solute segregation on grain boundary structure
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
AUGER ELECTRON SPECTROSCOPY
BINARY ALLOY SYSTEMS
CHEMICAL BONDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELECTRON SPECTROSCOPY
FRACTURE MECHANICS
GOLD ALLOYS
GRAIN BOUNDARIES
INTERFACES
IRON ALLOYS
LINE DEFECTS
MECHANICAL PROPERTIES
MECHANICS
METALLURGICAL EFFECTS
MICROSTRUCTURE
SEGREGATION
SOLUBILITY
SPECTROSCOPY
STRESSES