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Ternary Alloying of Gamma Titanium-Aluminides for Hot-Workability

Published online by Cambridge University Press:  26 February 2011

Naoya Masahashi
Affiliation:
R&D. Laboratories-I, Nippon Steel Corporation, Ida, Nakahara, Kawasaki, Kanagawa, 211 JAPAN
Y. Mizuhara
Affiliation:
R&D. Laboratories-I, Nippon Steel Corporation, Ida, Nakahara, Kawasaki, Kanagawa, 211 JAPAN
M. Matsuo
Affiliation:
R&D. Laboratories-I, Nippon Steel Corporation, Ida, Nakahara, Kawasaki, Kanagawa, 211 JAPAN
K. Hashimoto
Affiliation:
R&D. Laboratories-I, Nippon Steel Corporation, Ida, Nakahara, Kawasaki, Kanagawa, 211 JAPAN
M. Kimura
Affiliation:
R&D. Laboratories-I, Nippon Steel Corporation, Ida, Nakahara, Kawasaki, Kanagawa, 211 JAPAN
T. Hanamura
Affiliation:
R&D. Laboratories-I, Nippon Steel Corporation, Ida, Nakahara, Kawasaki, Kanagawa, 211 JAPAN
H. Fujii
Affiliation:
R&D. Laboratories-I, Nippon Steel Corporation, Ida, Nakahara, Kawasaki, Kanagawa, 211 JAPAN
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Abstract

A Microstructurally controlled γ(TiAl)-based alloy containing β(bcc) has shown remarkable tensile properties at high temperatures. It exhibits over 450% tensile elongation at 1473K. The strain rate sensitivity factors are calculated to be over 0.3 above 1273K. A specific texture is not observed from transmission X-ray photograph. TEM observation reveals that the precipitated β phase located at grain boundaries elongates uniformly along γ grain boundaries and causes large ductility. We propose β/γ dual phase alloys as high temperature deformable materials.

Type
Research Article
Copyright
Copyright © Materials Research Society 1991

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References

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