Published 1988 | Version v1
Book Metadata-only

Segregation of Y to grain boundaries in Cr/sub 2/O/sub 3/ and Al/sub 2/O/sub 3/ scales formed on ODS alloys

Creators

  • 1. H. H. Uhlig Corrosion Lab., MIT, Cambridge, MA (USA)

Description

Commercial, oxide-dispersion-strengthened (ODS) alloys, MA754 and MA956, were oxidized at 10000C in Ar-5%)/sub 2/ and in pure O/sub 2/, respectively. The microstructures and compositions of the Cr/sub 2/O/sub 3/ and Al/sub 2/O/sub 3/ scales formed on these alloys were studied by STEM. Using EDX analysis, concentration profiles for Y and Ti across grain boundaries in the scales were measured, which demonstrated strong segregation of Y and Ti to the oxide grain boundaries. Particles of Y/sub 2/O/sub 3/ and mixed Y/sub 2/O/sub 3/-Al/sub 2/O/sub 3/ were found in both scales, along with oxide particles that contained both Y and Ti. the effects of the segregation of Y to oxide grain boundaries on the rates and mechanisms of oxidation, on the scale microstructures, and on scale adhesion are discussed

Additional details

Publishing Information

Publisher
The Electrochemical Society.
Imprint Place
Pennington, NJ (USA)
Imprint Title
High temperature materials chemistry - IV. Volume 88-5
Journal Page Range
p. 306-313.

Conference

Title
4. symposium on high-temperature materials chemistry.
Dates
18-23 Oct 1987.
Place
Honolulu, HI (USA).

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
20048182
Subject category
S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
Resource subtype / Literary indicator
Conference
Descriptors DEI
ADHESION; ALLOYS; ALUMINIUM OXIDES; ARGON; CHEMICAL REACTION KINETICS; CHROMIUM OXIDES; GRAIN BOUNDARIES; OXIDATION; PRECIPITATION; QUANTITATIVE CHEMICAL ANALYSIS; SCALING; SCANNING ELECTRON MICROSCOPY; TITANIUM; TRANSMISSION ELECTRON MICROSCO; VERY HIGH TEMPERATURE; X-RAY DIFFRACTION; YTTRIUM
Descriptors DEC
ALUMINIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL ANALYSIS; CHEMICAL REACTIONS; CHROMIUM COMPOUNDS; COHERENT SCATTERING; CORROSION; CRYSTAL STRUCTURE; DIFFRACTION; ELECTRON MICROSCOPY; ELEMENTS; KINETICS; METALS; MICROSCOPY; MICROSTRUCTURE; NONMETALS; OXIDES; OXYGEN COMPOUNDS; RARE GASES; REACTION KINETICS; SCATTERING; SEPARATION PROCESSES; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS