Superplastic Properties of γ+α2 Titanium Aluminide Alloy Ti-43Al-(Nb,Mo,B) in Cast + Post-Solidification Heat Treated Condition

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A novel approach to fabrication of globularized fine-grained structure in γ+α2 titanium aluminide alloys has been proposed. The approach included the use of a specially designed alloy Ti-43Al-X(Nb,Mo,B) and heat treatment. It was found that the ingot structure of the alloy might be partially globularized on a scale of bulk material using only globularization anneal excluding any hot working procedure. The microstructure and tensile mechanical properties of the alloy in the cast + heat treated condition were investigated. The tensile mechanical tests were performed in air in the temperature range of T=900-1130°C at an initial strain rate of ε′=1.7×10-4 s-1. High elongation (δ=160-230%) and low flow stresses (σ=36-100 MPa) typical of superplastic behavior were measured at T=1050-1130°C. It was demonstrated that the sheet material produced by spark cutting of the cast + heat treated alloy might be successfully hot formed.

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Periodical:

Materials Science Forum (Volumes 551-552)

Edited by:

K.F. Zhang

Pages:

447-452

Citation:

V.M. Imayev et al., "Superplastic Properties of γ+α2 Titanium Aluminide Alloy Ti-43Al-(Nb,Mo,B) in Cast + Post-Solidification Heat Treated Condition", Materials Science Forum, Vols. 551-552, pp. 447-452, 2007

Online since:

July 2007

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$38.00

[1] R.S. Mishra, W.B. Lee and A.K. Mukherjee, in: Gamma Titanium Aluminides, edited by Y. -W. Kim, R. Wagner, M. Yamaguchi, the Minerals, Metals & Mater. Soc. (1995), p.571.

[2] S.L. Semiatin, J.C. Chesnutt, C. Austin and V. Seetharaman, in: Structural Intermetallics, edited by M.V. Nathal et al., the Minerals, Metals & Mater. Soc. (1997), p.263.

[3] D.M. Dimiduk, P.L. Martin and Y-W. Kim: Mater. Sci. Eng., Vol. A243 (1998), p.66.

[4] R.M. Imayev, G.A. Salishchev and V.M. Imayev et al.: Mat. Sci. & Eng., Vol. А300 (2001), p.263.

[5] R. Imayev, V. Imayev, M. Oehring and F. Appel: Intermetallics (2006), accepted to publication.

[6] T. Cheng, in: Gamma Titanium Aluminides, edited by Y-W. Kim, D.M. Dimiduk, M.H. Loretto, the Minerals Metals and Mater. Soc. (1999), p.389.

[7] T.T. Cheng and M.H. Loretto, in: Structural Intermetallics, edited by M.V. Nathal et al., the Minerals, Metals & Mater. Soc. (1997), p.253.

[8] Z. Zhang, K.J. Leonard, D.M. Dimiduk and V.K. Vasudevan, in: Structural Intermetallics, edited by K.J. Hemker et al., the Minerals, Metals & Mater. Soc. (2001), p.515.

[9] R. Kainuma, Y. Fujita, H. Mitsui, I. Ohnuma and K. Ishida: Intermetallics, Vol. 8 (2000), p.855.

[10] S. Mitao and L.A. Bendersky, in: Structural Intermetallics, edited by M.V. Nathal et al., the Minerals, Metals & Mater. Soc. (1997), p.177.

[11] Ju.F. Altunin and S.G. Glazunov: Titanium in industry (Мoscow, Oborongiz, Russia 1961).

[12] F. Sun and D. Lin: Scripta mater., Vol. 44 (2001), p.665.

[13] G. Das, P.A. Bartolotta, H. Kestler et al., in: Structural Intermetallics, edited by K.J. Hemker et al., the Minerals, Metals & Mater. Soc. (2001), p.121.