Work Hardening and Flow Softening of γ-TiAl Containing Ni


Article Preview

This paper presents the true stress - strain curves and data analyses of a Ni-containing TiAl and its reference alloy based on the isothermal compression tests at 1000°C and 0.01 - 1.0s-1 strain rates. The results show that the minor Ni addition makes the flow softening coming sooner and therefore significantly lowers the peak stress. Those effects, in addition with a better balance between the work hardening and flow softening during hot deformation, improve the steady state flow behavior of TiAl. The Ni-influence mechanisms are also suggested based on the TEM observation of dislocation configurations and lamellar breakdown during the deformation.



Materials Science Forum (Volumes 449-452)

Edited by:

S.-G. Kang and T. Kobayashi




J. H. Zhang et al., "Work Hardening and Flow Softening of γ-TiAl Containing Ni", Materials Science Forum, Vols. 449-452, pp. 833-836, 2004

Online since:

March 2004




[1] Y. W. Kim: JOM Vol. 41(1989), p.24.

[2] S. C. Huang and P. A. Siemers: Metall. Trans. A Vol. 20A (1989), p.1899.

[3] Y. W. Kim: Acta Metall. Mater. Vol. 40 (1992), p.1121.

[4] C.T. Liu, J.H. Schneibel, P.J. Wright and D.S. Easton: Intermetallics Vol. 4 (1996), p.429.

[5] G. E. Fuchs: Structural Intermetallics (TMS publications, USA 1993), p.195.

[6] V. Seetharaman and S. L. Semiatin: Metall. Mater. Trans. A Vol. 28A (1997), p.2309.

[7] S. L. Semiatin, N. Frey, S. M. EL-Soudani and J. D. Bryant: Mater. Trans. A Vol. 23A (1992), p.2309.

[8] J. Zhang, X. Su, E. Strom, Z. Y. Zhong and C. H. Li: Mater. Sci. Eng. A Vol. 329 – 331A (2002), p.499.

[9] J. Zhang, Z. Zhang, X. Su, D. Zou, Z. Zhong and C. H. Li: Intermetallics Vol. 8 (2000), p.321.

[10] T. Kawabata, T. Abumiya, T. Kanai and O. Izumi: Philos. Mag. A Vol. 54A (1994), p.681.