High-temperature oxidation behavior of a Ni-Cr-Al-Fe-Y alloy. [Ni-16Cr-4. 5Al-4Fe-0. 01Y-0. 04C]
- King Fahd Univ. of Petroleum and Minerals, Dhahran (Saudi Arabia)
A study was conducted to examine the isothermal oxidation behavior of a wrought Ni-Cr-Al-Fe-Y alloy in air at temperatures in the range of 950-1,150 C. Oxidation kinetics were determined from weight-change measurements. Analytical electron microscopy, scanning electron microscopy, and X-ray diffraction were used to characterize the morphology, structure, and composition of the oxide scale. Overall oxidation of the alloy was found to follow parabolic kinetics. Under steady-state conditions, the oxidation reaction appeared to be controlled by diffusional transport in an adherent Y-modified a-Al{sub 2}O{sub 3} scale with an activation energy of about 400KJ/mol. Yttrium was found to preferentially segregate to grain boundaries of a-Al{sub 2}O{sub 3} which maintained a fine columnar grain structure about 0.05-0.2 {mu}m in size. Based upon the results obtained, it was suggested that the role of Y was to promote the formation of a thin layer of a-Al{sub 2}O{sub 3} with improved mechanical strength.
- OSTI ID:
- 7068786
- Journal Information:
- Oxidation of Metals; (United States), Vol. 37:3-4; ISSN 0030-770X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HAYNES ALLOYS
OXIDATION
YTTRIUM
METALLURGICAL EFFECTS
ACTIVATION ENERGY
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
CARBON ADDITIONS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHROMIUM ALLOYS
DIFFUSION
EXPERIMENTAL DATA
GRAIN BOUNDARIES
GRAIN SIZE
HEAT TREATMENTS
IRON ALLOYS
MASS TRANSFER
MORPHOLOGY
NICKEL BASE ALLOYS
SCANNING ELECTRON MICROSCOPY
SULFUR ADDITIONS
TEMPERATURE RANGE 1000-4000 K
TRANSMISSION ELECTRON MICROSCOPY
WEIGHT
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY
YTTRIUM ADDITIONS
ALLOYS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT ALLOYS
COBALT BASE ALLOYS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
ENERGY
INFORMATION
KINETICS
METALS
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SCATTERING
SIZE
SPECTROSCOPY
TEMPERATURE RANGE
TRANSITION ELEMENTS
YTTRIUM ALLOYS
360105* - Metals & Alloys- Corrosion & Erosion