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Increase in γ/α2 Lamellar Boundary Density and its Effect on Creep Resistance of TiAl Alloy

Published online by Cambridge University Press:  26 February 2011

Kouichi Maruyama ,
Jun Matsuda  and
Hanliang Zhu
Kouichi Maruyama
Affiliation:
Graduate School of Environmental Studies, Tohoku University, 6–6–02 Aobayama, Aoba-ku, Sendai 980–8579, Japan
Jun Matsuda
Affiliation:
Graduate School of Environmental Studies, Tohoku University, 6–6–02 Aobayama, Aoba-ku, Sendai 980–8579, Japan
Hanliang Zhu
Affiliation:
Graduate School of Environmental Studies, Tohoku University, 6–6–02 Aobayama, Aoba-ku, Sendai 980–8579, Japan
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Abtsract

Several lamellar microstructures of a Ti-48 % Al alloy were made by changing heating rate in the α+γ dual phase field, and their creep properties were investigated at 1150 K. Average spacing and average length of α2 lamellae decrease with increasing heating rate. The decrease of α2 lamellar spacing is most effective at lower heating rate, and minimum creep rate decreases with increasing the heating rate, since a high density of γ/α2 boundaries stabilizes lamellar microstructure during creep. On the other hand creep rate increases at high heating rate, since α2 lamellar length becomes shorter with increasing heating rate. A reduction of creep rate by one order of magnitude is achieved at the optimum heating rate providing the best combination of narrow spacing and sufficiently long length of α2 lamellae.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S7.10
Copyright
Copyright © Materials Research Society 2005

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References

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