Grain boundary segregation and intergranular failure
Trace elements and impurities often segregate strongly to grain boundaries in metals and alloys. Concentrations of these elements at grain boundaries are often 10/sup 3/ to 10/sup 5/ times as great as their overall concentration in the alloy. Because of such segregation, certain trace elements can exert a disproportionate influence on material properties. One frequently observed consequence of trace element segregation to grain boundaries is the occurrence of grain boundary failure and low ductility. Less well known are incidences of improved ductility and inhibition of grain boundary fracture resulting from trace element segregation to grain boundaries in certain systems. An overview of trace element segregation and intergranular failure in a variety of alloy systems as well as preliminary results from studies on Al 3% Li will be presented.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-76OR00033
- OSTI ID:
- 5136465
- Report Number(s):
- CONF-8005109-1(Draft)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
ANTIMONY
BISMUTH
CRACKS
CRYSTAL STRUCTURE
DUCTILITY
ELEMENTS
FAILURES
FRACTURES
GRAIN BOUNDARIES
LEAD
LITHIUM ALLOYS
MECHANICAL PROPERTIES
METALS
MICROSTRUCTURE
NONMETALS
NUCLEATION
PHOSPHORUS
PRECIPITATION
SEGREGATION
SELENIUM
SEMIMETALS
SEPARATION PROCESSES
SULFUR
TELLURIUM
TENSILE PROPERTIES
TIN
TRACE AMOUNTS