Deformation Behavior of Dual-Phase LTSP Ti3Al Based Alloy


Article Preview

Ti3Al based alloys have been widely reported for their admirable superplasticity in the temperature range of 900-1000oC. However, the superplastic behavior of temperature lower than 900oC was seldom reported. Dual phase (α2+β) Ti3Al-10Nb alloy has shown superior superplastic elongation of 1500% at 960oC and 2x10-4 s-1. In this paper, it aims to investigate the superplastic behavior at lower temperature (700-900oC). The relationship of texture characteristics, phase transformation phenomena, and deformation mechanism at lower temperature (below 900oC) are studied. The optimum low-temperature superplastic condition with an elongation of 333% was occurred at 850oC and 5x10-4 s-1. With abundant hexagonal α2’ laths formed inside the β grains, the major accommodation process via dislocation slip across the β grains is impeded. It leads to premature failure and lower tensile elongations at lower temperature. Moreover, with the minor operating of grain rotations and grain boundary sliding, the texture intensity decreases significantly at temperature 850oC.



Key Engineering Materials (Volumes 340-341)

Edited by:

N. Ohno and T. Uehara




K.L. Yang and J.C. Huang, "Deformation Behavior of Dual-Phase LTSP Ti3Al Based Alloy", Key Engineering Materials, Vols. 340-341, pp. 71-76, 2007

Online since:

June 2007





[1] A. Miyazaki, M. Tokizane, and T. Inaba, J. Japan Inst. Metals, 54 (1990) 1279.

[2] A. Dutta and D. Banerjee, Scripta Metall. Mater., 24 (1990) 1319.

[3] Y. T. Wu and C. H. Koo, Intermetallics, 5 (1997) 29.

[4] K. L. Yang, J. C. Huang, and Y. N. Wang, Acta Mater., 51(2003) 2577.

[5] H. C. Fu, J. C. Huang, T. D. Wang, and C. C. Bampton, Acta Mater., 46 (1998) 465.

[6] T. K. Nandy and D. Banerjee, Intermetallics, 8 (2000) 915.

[7] H. Nakajima, W. Sprengel, and K. Nonaka, Intermetallics, 4 (1996) s17.

[8] J. Rusing and Chr. Herzig, Intermetallics, 4 (1996) 647.

[9] A. M. Brown and M. F. Ashby, Acta Metal., 28 (1980) 1085.

[10] K. L. Yang and J. C. Huang, Metall. Trans. A, 35A (2004) 3803. Fig. 5 Misorientation angle distributions of the (a) α2 and (b) β phases in the post-SP specimen at 850 o C under the optimum LTSP condition.

Fetching data from Crossref.
This may take some time to load.