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Hot Oxidation Resistance of an Intermetallic Nb-Ti-Al Alloy

Published online by Cambridge University Press:  22 February 2011

Oleg A. Bannykh ,
Elena N. Sheftel ,
Galina S. Usmanova  and
Anatoly A. Sharapov
Oleg A. Bannykh
Affiliation:
Baikov Institute of Metallurgy, Leninsky Prospect 49, Moscow, 117334, Russia
Elena N. Sheftel
Affiliation:
Baikov Institute of Metallurgy, Leninsky Prospect 49, Moscow, 117334, Russia
Galina S. Usmanova
Affiliation:
Baikov Institute of Metallurgy, Leninsky Prospect 49, Moscow, 117334, Russia
Anatoly A. Sharapov
Affiliation:
Baikov Institute of Metallurgy, Leninsky Prospect 49, Moscow, 117334, Russia
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Abstract

Structure, phase composition and air oxidation behavior in the temperature range 800 to 1400°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 -σ (Nb2Al type) and γ (TiAl type). Preliminary air oxidation at 1400°C decreases the oxidation rate at 1150°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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 969
Copyright
Copyright © Materials Research Society 1995

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