The role of Cr in promoting protective alumina scale formation by {gamma}-based Ti-Al-Cr alloys. 2: Oxidation behavior in air

Journal Article · Sun Jun 01 00:00:00 EDT 1997 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(96)00361-8· OSTI ID:514658

Brady, M P; Smialek, J L ^[1]; Humphrey, D L; Smith, J ^[2]

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1. NASA Lewis Research Center, Cleveland, OH (United States)
2. NYMA, Inc., Cleveland, OH (United States). NASA Lewis Group

The oxidation behavior of single-phase {gamma}, single-phase Laves, and two-phase {gamma} + Laves Ti-Al-Cr alloys was investigated at 1,000 C in air. The addition of 4--5 at.% Cr to the {gamma} phase resulted in protective alumina scale formation in dry air, but titania-based nodule formation in humid room air. Two-phase {gamma} + Laves alloys exhibited protective alumina scale formation in both dry air and humid room air. The difference in oxidation behavior between {gamma} and {gamma} + Laves alloys was interpreted in terms of compositional changes at the alloy/scale interface during oxidation.

• Sponsoring Organization: National Aeronautics and Space Administration, Washington, DC (United States)
• OSTI ID: 514658
• Journal Information: Acta Materialia, Vol. 45, Issue 6; Other Information: PBD: Jun 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TITANIUM ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
OXIDATION
ALUMINIUM OXIDES
PROTECTIVE COATINGS
CHROMIUM
METALLURGICAL EFFECTS
DISSOLUTION
LAVES PHASES
TITANIUM OXIDES