Abstract
The deformation behavior of a superplastic Ti-6A1-4V alloy at 927°C has been characterized by means of constant strain-rate tensile tests up to large plastic strain. Significant hardening has been recorded in the course of deformation. Microstructural studies on deformed samples indicate the occurrence of simultaneous strain-rate induced grain growth, which explains nearly all of the hardening. A small amount of hardening may also be expected from grain elongation or grain clustering effects. As a result of concurrent grain growth, the strain-rate sensitivity is found to decrease with strain, thus indicating that stress-strain rate behavior determined initially may not be applicable after large amounts of plastic strain. The stressJstrain-rate data obtained from step strain-rate test for a variety of grain sizes, together with the grain growth kinetics plots, provide a means for developing a constitutive description for this material at large strains.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
C. H. Hamilton:Formability, Analysis, Modeling and Experimentation, Proceedings of AIME Fall Meeting, Chicago, TMS-AIME Publication, 1978.
N. Paton:J. Eng. Mater Techno!., 1976, vol. 97, p. 313.
D. Lee and W. A. Backofen:Trans. TMS-AIME, 1967, vol. 239, pp. 1034–40.
A. K. Ghosh and R. A. Ayers:Met. Trans. A, 1976, vol. 7A, pp. 1589–91.
J. Hedworth and M. J. Stowell:J Mater. Sa., 1971, vol. 6, p. 1061.
C. P. Cutler: Ph.D. Thesis, University of Cambridge, 1971.
A. Arieli and A. Rosen:Met.Trans. A, 1977, vol. 8A, p. 1591.
B. M. Watts and M. J. Stowell:J. Mater. Sci., 1971, vol. 6, pp. 228–37.
M. Surey and B. Baudelet:J. Mater. Sci., 1973, vol. 8, pp. 363–69.
A. K. Ghosh:Met. Trans. A, 1977, vol. 8A, pp. 1221–31.
W. Rostoker and J. R. Drorak:Interpretation of Metallographic Structures, p. 224, Academic Press, 1976.
S. P. Agrawal, C. H. Hamilton, and E. D. Weisert: Unpublished research, Rockwell International Corporation, Los Angeles Division, 1977.
R.C. Gifkins:Trans. TMS-AIME, 1959, vol. 215, pp. 1015–22.
P. Ducheyne and P. DeMeester:J. Mater. Sci., 1974, vol. 9, pp. 109–16.
M. F. Ashby and R. A. Verrai:ActaMet., 1973, vol. 21, p. 149.
D. J. Dingley:Trends in Physics, p. 319, European Physics Soc, Geneva, 1973.
F. R. N. Nabarro:Report on Conf. on Strength of Solids, p. 75, Phys. Soc, London,1948.
C. Herring:J. Appl. Phys., 1950, vol. 21, p. 437.
R. L. Coble:J. Appl. Phys., 1963, vol. 34, p. 1679.
N. F. Mort:Proc. Phys. Soc. B, 1951, vol. 64, p. 729.
A. S. M. Eleiche: Air Force Report AFML-TR-72-125, Wright Patterson AFB, Dayton, OH, September 1972.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ghosh, A.K., Hamilton, C.H. Mechanical behavior and hardening characteristics of a superplastic Ti-6AI-4V alloy. Metall Trans A 10, 699–706 (1979). https://doi.org/10.1007/BF02658391
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02658391