Abstract
A comparison of the superplastic deformation behaviour of Ti-6Al-4V (wt%) between 760 and 940‡ C and Ti-6Al-2Sn-4Zr-2Mo between 820 and 970‡ C has been carried out on sheet materials possessing similar as-received microstructures. High tensile elongations were obtained with maximum values being recorded at 880‡ C for Ti-6Al-4V (Ti-6/4) and at 940‡ C for Ti-6Al-2Sn-4Zr-2Mo (Ti-6/2/4/2), under which conditions both alloys possessed aΒ phase proportion of approximately 0.40. For a given deformation temperature the Ti-6/4 alloy had a slightly lower flow stress than the Ti-6/2/4/2, and this was attributed to the lowerΒ phase proportion in the latter alloy. However, at the respective optimum deformation temperatures the Ti-6/2/4/2 alloy had the lower flow stress. The results show that suitably processed Ti-6/2/4/2 alloy is capable of withstanding substantial superplastic strains at relatively low flow stresses, although the optimum deformation temperature is higher for this alloy than for Ti-6/4 material possessing a similar microstructure.
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N. E. Paton andC. H. Hamilton Met. Trans. A 10A (1979) 241.
A. K. Ghosh andC. H. Hamilton ibid. 10A (1979) 699.
A. Arieli andA. K. Mukherjee,Mat. Sci. Eng. 43 (1980) 47.
O. A. Kaibyshev, I. V. Kazachkov andR. M. Galeev,J. Mater. Sci. 16 (1981) 2501.
N. Furushiro, H. Ishibashi, S. Shimoyama andS. Hori, in Proceedings of 4th International Conference on Titanium Science and Technology, Kyoto, May 1980, edited by H. Kimura and O. Izumi (Metallurgical Society of AIME, Warrendale, Pennsylvania, 1980) p. 993.
E. D. Weisert andG. W. Stacher, in Proceedings of International Conference on Superplastic Forming of Structural Alloys, San Diego, June 1982 edited by N. E. Paton and C. H. Hamilton (Metallurgical Society of AIME, Warrendale, Pennsylvania, 1982) p. 273.
J. R. Williamson,ibid.in, p. 241.
B. W. Kim,ibid.in, p. 291.
D. Eylon, S. Fujishiro, P. J. Postans andF. H. Froes,J. Metals 36(11) (1984) 55.
S. M. L. Sastry, R. J. Lederich, T. L. Mackay andW. R. Kerr,ibid. 35(1) (1983) 48.
M. T. Cope, MSc thesis, University of Manchester (1982).
I. Polmear, “Metallurgy of the Light Metals” (Edward Arnold, London, 1982) p. 165.
J. W. D. Patterson andN. R. Ridley,J. Mater. Sci. 16 (1981) 457.
J. R. Leader, C. Hammond andD. F. Neal, in Proceedings of International Conference on Superplastic Forming of Structural Alloys, San Diego, June 1982, edited by N. E. Paton and C. H. Hamilton (Metallurgical Society of AIME, Warrendale, Pennsylvania, 1982) p. 355.
J. A. Wert andN. E. Paton, in Proceedings of 6th International Conference on Strength of Metals and Alloys, Melbourne, 1982, edited by R. C. Gifkins (Pergamon Press, Oxford, 1982) p. 727.
Idem, Met. Trans. A 14A (1983) 2535.
N. E. Paton andJ. A. Hall, US Patent 4 299 626 (1981).
C. Hammond andJ. Nutting Metal Sci. 11 (1977) 474.
C. H. Hamilton, A. K. Ghosh andM. W. Mahoney, in Proceedings of Conference on Advanced Processing Methods for Titanium, edited by D. F. Hasson and C. H. Hamilton (Metallurgical Society of AIME, Warrendale, Pennsylvania, 1982) p. 124.
J. W. Edington, K. N. Melton andC. P. Cutler,Prog. Mater. Sci. 21(3) (1976) 61.
M. T. Cope, unpublished research (1983).
M. J. Stowell, in Proceedings of International Conference on Superplastic Forming of Structural Alloys, San Diego, June 1982, edited by N. E. Paton and C. H. Hamilton (Metallurgical Society of AIME, Warrendale, Pennsylvania, 1982) p. 321.
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Cope, M.T., Evetts, D.R. & Ridley, N. Superplastic deformation characteristics of two microduplex titanium alloys. J Mater Sci 21, 4003–4008 (1986). https://doi.org/10.1007/PL00020272
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DOI: https://doi.org/10.1007/PL00020272