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Strengthening Mechanisms in Some Single-Crystal Superalloys
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Strengthening Mechanisms in Some Single-Crystal Superalloys

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Abstract:

The creep behavior and microstructure of several nickel-base single-crystal superalloys after high-temperature low-stress creep have been investigated. These alloys were designed with varying content of the alloying elements Mo and Ru. At 1100°C and 137 MPa, the large g/g¢ lattice misfit in negative with the addition of Mo leads to the formation of dense interfacial dislocation networks. These dislocation networks are effective to strengthen the alloys during creep by preventing the penetration of the g dislocations into the g¢ phase.

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Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

623-626

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.623

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Online since:

January 2005

Authors:

Yuichiro Koizumi, Hiroshi Harada

Keywords:

Alloying Addition, Creep Deformation, Dislocation, Superalloy

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] T.M. Pollock and A.S. Argon: Acta Metall. Mater. Vol. 40 (1992), p.1.

Google Scholar

[2] R.A. MacKay and L.J. Ebert: Scr. Metall. Vol. 17 (1983), p.1217.

Google Scholar

[3] N. Matan, D.C. Cox, P. Carter, C.M.F. Rae and R.C. Reed: Acta Mater. Vol. 47 (1999), p.1549.

Google Scholar

[4] F.R.N. Nabarro and H.L. Villiers: The Physics of Creep (Taylor & Francis, London 1995).

Google Scholar

[5] J.X. Zhang, T. Murakumao, Y. Koizumi, T. Kobayashi, H. Harada and S. Masaki: Metall. Mater. Trans. Vol. 33A (2002), p.3741.

Google Scholar

[6] J.X. Zhang, T. Murakumo, H. Harada, and Y. Koizumi: Scr. Mater. Vol. 48 (2003), p.287.

Google Scholar

[7] J.X. Zhang, T. Murakumo, Y. Koizumi and H. Harada: J. Mater. Sci. Vol. 38 (2003), p.4883.

Google Scholar

[8] Y. Koizumi, J.X. Zhang, T. Kobayashi, T. Yokokawa, H. Harada, Y. Aoki and M. Arai: J. Japan Inst. Metals Vol. 67 (2003), p.468.

Google Scholar

[9] J.X. Zhang, Y. Koizumi, T. Kobayashi, T. Murakumao and H. Harada: Metall. Mater. Trans. 2004, in press.

Google Scholar

[10] J.X. Zhang, T. Murakumao, H. Harada, Y. Koizumi and T. Kobayashi: submitted to superalloys 2004, USA.

Google Scholar

[11] T. Yokokawa, M. Osawa, K. Nishida, T. Kobayashi, Y. Koizumi and H. Harada: Scr. Mater. Vol. 49 (2003), p.1041. Fig. 4 Minimum creep rates of the superalloys as a function of their interfacial dislocation spacing.

Google Scholar