Hot oxidation resistance of an intermetallic Nb-Ti-Al alloy

Book · Sat Jul 01 04:00:00 EDT 1995

OSTI ID:72503

Bannykh, O A; Sheftel, E N; Usmanova, G S; Sharapov, A A ^[1]

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1. Baikov Inst. of Metallurgy, Moscow (Russian Federation)

Structure, phase composition and air oxidation behavior in the temperature range 800 to 1,400 C of a Nb-Ti-Al-based intermetallic alloy with the chemical composition (wt %):Nb-47.0; Ti-23.9; Al-21.0, V-4.4, and Cr-4.1 have been studied. The alloy structure is two-phase {minus}{sigma} (Nb{sub 2}Al type) and {gamma} (TiAl type). Preliminary air oxidation at 1,400 C decreases the oxidation rate at 1,150 C by a factor 2 to 3. It is connected with the formation of a protective scale (rutile and corundum with chromium and vanadium additions), refining of the alloy structure, and the formation of an internally oxidized underscale.

• OSTI ID: 72503
• Report Number(s): CONF-941144--; ISBN 1-55899-265-0
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CORROSION RESISTANCE
EXPERIMENTAL DATA
HEAT RESISTING ALLOYS
INTERMETALLIC COMPOUNDS
MICROSTRUCTURE
NIOBIUM ALLOYS
OXIDATION
PHASE STUDIES
SCALING
TEMPERATURE RANGE 1000-4000 K
TITANIUM ALLOYS