Effect of 0. 1 at. % zirconium on the cyclic oxidation resistance of. beta. -NiAl

Journal Article · Thu Dec 01 04:00:00 EST 1988 · Oxid. Met.; (United States)

DOI:https://doi.org/10.1007/BF00659006· OSTI ID:6369099

Barrett, C A

The effect of 0.1 at.% Zr(0.2 wt. % Zr) on the cyclic oxidation of hipped ..beta..-NiAl was studied. Oxidation testing was performed in static air at 1100-1200/sup 0/C, using 1-hr exposure cycles for test times up to 3000 hr. The weight change versus time data were modeled with the COSP computer program to analyze and predict cyclic-oxidation behavior. Zr additions significantly change the nature of the scale-spalling process during cooling so that the oxide spalls near the oxide-air interface at a relatively low depth within the scale. Without Zr, the predominantly ..cap alpha..-Al/sub 2/O/sub 3/ scale tends to spall randomly to bare metal at relatively high effective-scale-loss rates, particularly at 1150/sup 0/C and 1200/sup 0/C. This leads to higher rates of Al consumption for the Zr-free aluminide and much earlier depletion of al, leading to eventual breakaway (i.e., failure).

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA)
• OSTI ID: 6369099
• Journal Information: Oxid. Met.; (United States), Journal Name: Oxid. Met.; (United States) Vol. 30:5-6; ISSN OXMEA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM ALLOYS
C CODES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COATINGS
COHERENT SCATTERING
COMPUTER CODES
COMPUTERIZED SIMULATION
CORROSION PROTECTION
CORROSION RESISTANCE
DESCALING
DIFFRACTION
ELECTRON MICROPROBE ANALYSIS
ELECTRON MICROSCOPY
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
MATERIALS
MATERIALS TESTING
METALLOGRAPHY
METALLURGICAL EFFECTS
MICROANALYSIS
MICROSCOPY
NICKEL ALLOYS
OXIDATION
PROTECTIVE COATINGS
SCALING
SCANNING ELECTRON MICROSCOPY
SCATTERING
SIMULATION
SURFACE FINISHING
TESTING
THERMAL CYCLING
TIME DEPENDENCE
WEIGHT MEASUREMENT
X-RAY DIFFRACTION
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS