The effect of alloy grain size on the transient oxidation behavior of an alumina-forming alloy. [Ni-16. 2%Cr-4. 7%Al-2. 5%Fe-0. 01%Si-0. 02%Y]

Journal Article · Wed Apr 01 00:00:00 EST 1992 · Oxidation of Metals; (United States)

DOI:https://doi.org/10.1007/BF00665186· OSTI ID:7018977

Goedjen, J G; Shores, D A ^[1]

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1. Univ. of Minnesota, Minneapolis (United States)

In the early stages of alloy oxidation, diffusion of solute through the metal to the surface is important in determining the composition of the oxide scale that forms during the transient stage. Rapid solute diffusion to the interface will promote the formation of a protective scale, thereby suppressing the formation of base-metal oxide. The effect of alloy grain size on the formation of the transient oxide scale has been studied using a very fine grained NiCrAlY alloy produced by plasma spraying. The long-term oxidation behavior of this alloy was found to be independent of the grain size of the underlying alloy. However, the short-term, transient oxidation rate was found to decrease with decreasing alloy grain size. This is attributed to the rapid grain boundary transport of Al and Cr to the oxide/metal interface which promoted the formation of Cr{sub 2}O{sub 3} and Al{sub 2}O{sub 3}.

• DOE Contract Number: FG02-88ER45337
• OSTI ID: 7018977
• Journal Information: Oxidation of Metals; (United States), Vol. 37:3-4; ISSN 0030-770X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
GRAIN SIZE
OXIDATION
CHROMIUM ALLOYS
IRON ALLOYS
NICKEL BASE ALLOYS
ALUMINIUM
ALUMINIUM OXIDES
CHEMICAL REACTION KINETICS
CHROMIUM
CHROMIUM OXIDES
CORRELATIONS
CRYSTAL GROWTH
DIFFUSION
EXPERIMENTAL DATA
GRAIN BOUNDARIES
HEAT TREATMENTS
INTERFACES
MASS TRANSFER
PLASMA ARC SPRAYING
PROTECTIVE COATINGS
SCANNING ELECTRON MICROSCOPY
SILICON ADDITIONS
TEMPERATURE RANGE 1000-4000 K
THERMAL GRAVIMETRIC ANALYSIS
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
YTTRIUM ADDITIONS
ALLOYS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
COATINGS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DEPOSITION
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
GRAVIMETRIC ANALYSIS
INFORMATION
KINETICS
METALS
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
SCATTERING
SILICON ALLOYS
SIZE
SPECTROSCOPY
SPRAY COATING
SURFACE COATING
TEMPERATURE RANGE
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YTTRIUM ALLOYS
360105* - Metals & Alloys- Corrosion & Erosion
360102 - Metals & Alloys- Structure & Phase Studies