An /sup 18/O tracer study on the growth mechanism of alumina scales on NiAl and NiAlY alloys

Journal Article · Mon Dec 01 04:00:00 EST 1986 · Oxid. Met.; (United States)

DOI:https://doi.org/10.1007/BF00659341· OSTI ID:7046616

Young, E W; De Wit, J H.W.

The effect of Y additions on the oxidation mechanism of NiAl at 1270 K has been investigated. Mass transport in the alumina scale was examined with /sup 18/O tracers. Proton activation analysis (/sup 18/O(p, ..cap alpha..)/sup 15/N) and SIMS were used to measure the /sup 18/O distribution in the scale. On pure NiAl and low-doped (0.07% Y) NiAl mainly outward scale growth was observed. Addition of 0.5% Y induces oxide formation at both interfaces of the scale. Larger quantities of Y added to the alloy (> 0.5%) do not dissolve completely in the NiAl, but form Y-rich segregates. Internal oxidation of these intergranular segregates was observed. The relation between the modification of the scale-growth mechanism and the improved adherence of the scale to the alloy due to the addition of Y is discussed.

• Research Organization: State Univ. Utrecht, Utrecht
• OSTI ID: 7046616
• Journal Information: Oxid. Met.; (United States), Journal Name: Oxid. Met.; (United States) Vol. 26:5-6; 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
ACTIVATION ANALYSIS
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARYON REACTIONS
CHALCOGENIDES
CHARGED-PARTICLE REACTIONS
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
DISTRIBUTION
HADRON REACTIONS
ION MICROPROBE ANALYSIS
KINETICS
MASS SPECTROSCOPY
MICROANALYSIS
MICROSTRUCTURE
NICKEL ALLOYS
NONDESTRUCTIVE ANALYSIS
NUCLEAR REACTIONS
NUCLEON REACTIONS
OXIDATION
OXIDES
OXYGEN 18 TARGET
OXYGEN COMPOUNDS
PROTON REACTIONS
REACTION KINETICS
SCALING
SPATIAL DISTRIBUTION
SPECTROSCOPY
TARGETS
TEMPERATURE EFFECTS
VERY HIGH TEMPERATURE
YTTRIUM ADDITIONS
YTTRIUM ALLOYS