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

Journal Article · Thu Dec 01 00:00:00 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), Vol. 30:5-6
• Country of Publication: United States
• Language: English

Related Subjects

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