Abstract
Room temperature tensile properties of polycrystal Ti–47Al–2Mn–2Nb alloy with near lamellar (NL) microstructures were investigated at the strain rates between 10−5 and 1000 s−1 using a self-designed Split-Hopkinson tensile bar setup with a rotating disk and conventional testing machine. It was found that tensile ductility varies within a narrow range with the strain rate, while dynamic strengths (σd) of the alloy are obviously higher than static strengths (σs). There exists linear relationship between σs and the logarithm of the strain rate (ln έ), and between σd and the strain rate itself (έ). Fractography analysis indicates that the alloy fractures in a mixed mode of predominant transgranular cleavage and minor intergranular cracking under static and dynamic strain rates. Environmental effect is excluded from the main cause for the room temperature brittleness of the investigated alloy.
Similar content being viewed by others
References
Y.-W. Kim, Journal of Metals 46 (1994) 30.
E. S. C. Chin, T. Weerasooriya and P. Woolsey, in "Gamma Titanium Aluminides," edited by Y.-W. Kim, R.Wagner and M. Yamaguchi (TMS, Warrendale, PA, 1995). p. 451.
S. A. Maloy and G. T. Gray III, Acta Mater. 44 (1996) 1741.
G. T. Gray III, J. de Phys. IV, 4 (1994) C8–373.
S. A. Maloy and G. T. Gray III, in "Gamma Titanium Aluminides," edited by Y.-W. Kim, R. Wagner, and M. Yamaguchi (TMS, Warrendale, PA, 1995) p. 307.
Z. Jim, G. T. Gray III and Y.-W. Kim, accepted by Metall. Trans. A, (1998).
L. S. Harbison, D. A. Koss and R. J. Boucier, in "Titanium '92, Science and Technology," edited by F. H. Froes and I. Caplan (TMS, Warrendale, PA) 1993, p. 1661.
Z. Wang, Y. Zhou and Y. Xia, J. Mater. Sci. 32 (1997) 2387.
M. Chen, D. Lin (T. L. Lin), and C. T. Liu, "Influence of Strain rate on Fracture mode of A polycrystalline Ni3Al," to be published in Scrip. Mater.
_ M. Chen, D. Lin, D. Chen, D. Wang, Y. Xia and M. Yamaguchi, "Dynamic Mechanical Properties of polysynthetically twined (PST) crystals of TiAl with Hard Orientation under Tensile Impact," to be published in Scrip. Mater.
_ D. Lin, Y. Wang and C. C. Law, Mater. Sci. Eng. A 239/240 (1997) 369.
D. Schechtman, M. Blackburn and H. A. Lipitt, Metall. Trans. 5 (1974) 2.
M. H. Yoo and C. T. Liu, ISIJ International, 31 (1991) 1049.
Y.-W. Kim, Acta Metall. 40 (1992) 1121.
C. T. Liu and Y.-W. Kim, Scrip. Metall. Mater. 27 (1992) 599.
E. Nadgornyi, Prog. Mater. Sci. 31 (1988) 1.
G. Regazzoni, U. F. Kocks and P. S. Follansbee, Acta Metall. 35 (1987) 2865.
J. Harding, Archives in Mechanics 27 (1975) 715.
Rights and permissions
About this article
Cite this article
Wang, Y., Lin, D., Lin, T.L. et al. Dynamic tensile properties of Ti–47Al–2Mn–2Nbs alloy. Journal of Materials Science 34, 509–513 (1999). https://doi.org/10.1023/A:1004538511115
Issue Date:
DOI: https://doi.org/10.1023/A:1004538511115