Nitrogen-doped TiAl alloys - Part I - Microstructure control

Effects of nitrogen addition on the microstructure control of two-phase TiAl intermetallic compounds were investigated. 1.0 at.% nitrogen addition leads to remarkable grain refinement in the fully lamellar microstructure but had little effect on the duplex microstructure. Only Ti3AlN precipitate was formed in 0.3 at.% nitrogen-doped alloy and both Ti2AlN and Ti3AlN precipitates were formed in 1.0 at.% nitrogen-doped alloy. Since the formation of the gamma phase is retarded by nitrogen addition, long-term heat treatment is needed for the duplex microstructure in the 1.0 at.% nitrogen-doped alloy. Though 0.3 at.% nitrogen-doped alloy had much lower elongation than the mother alloy, 1.0 at.% nitrogen addition had little effect on room temperature elongation and increased room temperature yield strength by two times in the fully lamellar microstructure. (C) 2000 Kluwer Academic Publishers.
Publisher
KLUWER ACADEMIC PUBL
Issue Date
2000-09
Language
ENG
Keywords

GAMMA-TITANIUM ALUMINIDES; MECHANICAL-PROPERTIES

Citation

JOURNAL OF MATERIALS SCIENCE, v.35, no.18, pp.4527 - 4532

ISSN
0022-2461
URI
http://hdl.handle.net/10203/1790
Appears in Collection
NE-Journal Papers(저널논문)
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