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Environmental embrittlement of γ titanium aluminide

Published online by Cambridge University Press:  31 January 2011

T. Takasugi ,
S. Hanada  and
M. Yoshida
T. Takasugi
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980, Japan
S. Hanada
Affiliation:
Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980, Japan
M. Yoshida
Affiliation:
Miyagi National College of Technology, Natori, Miyagi-prefecture 981-12, Japan
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Abstract

The environmental embrittlement for the nearly stoichiometric TiAl compound, the microstructure of which consists of monophase γ with equiaxed grains, was evaluated by tensile tests, to determine the effects of the atmospheres used (vacuum, O2 gas, air, and H2 gas) and the testing temperatures (R.T. to 1173 K). At room temperature, the highest elongation and UTS values were observed in the samples tested in vacuum, while the worst values were observed in the samples tested in H2 gas. Transgranular cleavage fracture was dominant and primarily independent of the environmental media. At intermediate temperatures, the samples tested in vacuum exhibited higher elongation and UTS values than those tested in air. Intergranular fracture became more dominant as temperature increased but was insensitive to the environmental media. Based on these results, the mechanism responsible for the observed environmental embrittlement and the implications were discussed.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 10 , October 1992 , pp. 2739 - 2746
Copyright
Copyright © Materials Research Society 1992

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References

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