Recent developments concerning segregation and fracture at grain boundaries
Certain trace impurities have long been known to embrittle grain boundaries in polycrystalline metals and alloys. In recent years a large body of evidence, directly connecting impurity segregation to intergranular failure, has become available. Indeed, it was conventional wisdom for a time that all intergranular failure could be attributed to segregation of embrittling impurities, and that all segregation degrades grain boundary cohesion. There have been several interesting experimental and theoretical developments during the last 5 to 10 years that run counter to this conventional wisdom, some of which may significantly advance our understanding of the mechanism by which impurities affect grain boundary cohesion. Several examples of beneficial grain boundary segregants will be presented, and the relationship between segregation behavior and grain boundary cohesion will be discussed. 24 refs., 8 figs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5191619
- Report Number(s):
- CONF-851174-2; ON: DE85018106
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
AUGER ELECTRON SPECTROSCOPY
BORON
CHEMICAL REACTIONS
CORROSION
CRYSTAL STRUCTURE
DATA
DUCTILITY
ELECTRON SPECTROSCOPY
ELEMENTS
EMBRITTLEMENT
EXPERIMENTAL DATA
GRAIN BOUNDARIES
IMPURITIES
INFORMATION
INTERGRANULAR CORROSION
INTERMETALLIC COMPOUNDS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
MICROSTRUCTURE
NICKEL ALLOYS
NUMERICAL DATA
SEMIMETALS
SPECTROSCOPY
STRESSES
TENSILE PROPERTIES