The cyclic oxidation behavior of oxide-dispersed {beta}-NiAl

Book · Sat Jul 01 04:00:00 EDT 1995

OSTI ID:72506

Pint, B A; Hobbs, L W ^[1]

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1. Massachusetts Inst. of Technology, Cambridge, MA (United States). H.H. Uhlig Corrosion Lab.

Short-term cyclic oxidation tests were performed at 1,200 C and 1,500 C on P-NiAl with 1 vol% oxide dispersions of Y{sub 2}O{sub 3}, La{sub 2}O{sub 3} and Al{sub 2}O{sub 3}. The Y{sub 2}O{sub 3} addition resulted in a very adherent {alpha}-Al{sub 2}O{sub 3} scale at 1,200 C, with some improvement in the scale adhesion at 1,500 C, compared to an undoped {beta}-NiAl alloy. The La{sub 2}O{sub 3} and Al{sub 2}O{sub 3} additions resulted in more severe oxidation than the undoped {beta}-NiAl at 1,200 C. Both Y and La ions are found to segregate to {alpha}-Al{sub 2}O{sub 3} scale grain boundaries using scanning transmission electron microscopy/energy dispersive x-ray analysis. However, at both 1,200 C and 1,500 C, the La addition appears to cause a rapid increase in the isothermal oxidation rate, leading to excessive scale spallation.

• OSTI ID: 72506
• Report Number(s): CONF-941144--; ISBN 1-55899-265-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ALUMINIUM OXIDES
CORROSION PRODUCTS
EXPERIMENTAL DATA
INTERMETALLIC COMPOUNDS
LANTHANUM OXIDES
METALLURGICAL EFFECTS
NICKEL ALLOYS
OXIDATION
TEMPERATURE RANGE 1000-4000 K
YTTRIUM OXIDES