Nitrogen-doped TiAl alloys - Part II - Plastic deformation behavior

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Effects of the nitrogen addition on high temperature tensile properties and creep resistance of the fully lamellar and the duplex Ti-48.5Al-1.5Mo (at.%) alloy were investigated. High temperature yield strength of the nitrogen-doped alloys increased due to solute hardening and precipitation hardening of Ti3AlN. Nitrogen addition led to remarkable improvement of creep resistance in the duplex microstructure as well as in the fully lamellar microstructure. In particular, the primary creep deformation of the 1.0 at.% nitrogen-doped alloy with the duplex microstructure decreased definitely to a similar or superior level of the fully lamellar alloy. We consider that precipitate hardening of p-phase (Ti3AlN) and solute hardening of nitrogen atoms may be responsible for such remarkable creep resistance of the nitrogen-doped alloys. (C) 2000 Kluwer Academic Publishers.
Publisher
KLUWER ACADEMIC PUBL
Issue Date
2000-09
Language
ENG
Article Type
Article
Keywords

GAMMA-TITANIUM ALUMINIDES; CREEP-BEHAVIOR

Citation

JOURNAL OF MATERIALS SCIENCE, v.35, no.18, pp.4533 - 4537

ISSN
0022-2461
URI
http://hdl.handle.net/10203/1789
Appears in Collection
NE-Journal Papers(저널논문)
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