Effect of the /theta/-/alpha/-Al/sub 2/O/sub 3/ transformation on the oxidation behavior of /beta/-NiAl + Zr
Journal Article
·
· Oxid. Met.; (United States)
Isothermal oxidation of NiAl + Zr has been performed over the temperature range of 800-1,200/degree/C and studied by TGA, XRD, and SEM. A discontinuous decrease in growth rate of two orders of magnitude was observed at 1,000/degree/C due to the formation of /alpha/-Al/sub 2/O/sub 3/ from /theta/-Al/sub 2/O/sub 3/. This transformation also resulted in a dramatic change in the surface morphology of the scales, as a whisker topography was changed into a weblike network of oxide ridges and radial transformation cracks. It is believed that the ridges are evidence for a short-circuit outward aluminum diffusion growth mechanism that has been documented in a number of /sup 18/O tracer studies.
- Research Organization:
- NASA Lewis Research Center, Cleveland, OH (USA)
- OSTI ID:
- 5677290
- Journal Information:
- Oxid. Met.; (United States), Journal Name: Oxid. Met.; (United States) Vol. 31:3-4; ISSN OXMEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COHERENT SCATTERING
COMPOSITE MATERIALS
CORROSION RESISTANCE
CRACK PROPAGATION
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
DIFFUSION
ELECTRON MICROSCOPY
ELEMENTS
EVEN-EVEN NUCLEI
GRAVIMETRIC ANALYSIS
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
MATERIALS
MATERIALS TESTING
METALLURGICAL EFFECTS
METALS
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
NUCLEI
OXIDATION
OXIDES
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PHASE TRANSFORMATIONS
QUANTITATIVE CHEMICAL ANALYSIS
SCALING
SCANNING ELECTRON MICROSCOPY
SCATTERING
STABLE ISOTOPES
TEMPERATURE EFFECTS
TESTING
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRACER TECHNIQUES
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
ZIRCONIUM
360105* -- Metals & Alloys-- Corrosion & Erosion
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COHERENT SCATTERING
COMPOSITE MATERIALS
CORROSION RESISTANCE
CRACK PROPAGATION
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
DIFFRACTION
DIFFUSION
ELECTRON MICROSCOPY
ELEMENTS
EVEN-EVEN NUCLEI
GRAVIMETRIC ANALYSIS
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
MATERIALS
MATERIALS TESTING
METALLURGICAL EFFECTS
METALS
MICROSCOPY
MICROSTRUCTURE
NICKEL ALLOYS
NUCLEI
OXIDATION
OXIDES
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PHASE TRANSFORMATIONS
QUANTITATIVE CHEMICAL ANALYSIS
SCALING
SCANNING ELECTRON MICROSCOPY
SCATTERING
STABLE ISOTOPES
TEMPERATURE EFFECTS
TESTING
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRACER TECHNIQUES
TRANSITION ELEMENTS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
ZIRCONIUM