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Assessing Failure Mechanisms During Transformation Superplasticity of Ti-6Al-4V

Published online by Cambridge University Press:  10 February 2011

C. Schuh  and
D. C. Dunand
C. Schuh
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA
D. C. Dunand
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA
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Abstract

During thermal cycling through the α/β phase transformation under the action of a small external biasing stress, Ti alloys exhibit an average deformation stress exponent of unity and achieve superplastic strains. We report tensile experiments on Ti-6Al-4V with an applied stress of 4.5 MPa, aimed at understanding the failure processes during transformation superplasticity. The development of cavities is assessed as a function of superplastic elongation, and macroscopic neck formation is quantified at several levels of elongation by digital imaging techniques. The effects of thermal inhomogeneity on neck initiation and propagation are also elucidated experimentally.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 55
Copyright
Copyright © Materials Research Society 2000

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References

1. Nieh, T.G., Wadsworth, J., and Sherby, O. D., Superplasticity in Metals and Ceramics. (Cambridge University Press, Cambridge, 1997).10.1017/CBO9780511525230Google Scholar
2. Schuh, C and Dunand, D. C., Acta Mater. 46, 5663 (1998).10.1016/S1359-6454(98)00252-3Google Scholar
3. Dunand, D. C. and Bedell, C. M., Acta Mater. 44, 1063 (1996).10.1016/1359-6454(95)00224-3Google Scholar
4. Dunand, D. C. and Myojin, S., Mater. Sci. Eng. 230A, 25 (1997).10.1016/S0921-5093(97)00033-6Google Scholar
5. Schuh, C, Zimmer, W., and Dunand, D. C.. in Creep Behavior ofAdvanced Materialsfor the 21st Century edited by Mishra, R. S., Mukherjee, A.K., and Murty, K.L. (Warrendale PA, TMS, 1999) p. 61.Google Scholar
6. Kot, R., Krause, G., and Weiss, V.. in The Science, Technology and Applications of Titanium edited by Jaffe, R.I. and Promisel, N.E. (Oxford, Pergamon, 1970) p. 597 10.1016/B978-0-08-006564-9.50067-1Google Scholar
7. Zwigl, P. and Dunand, D. C., Metall. Mater. Trans. 29A, 2571 (1998).10.1007/s11661-998-0229-4Google Scholar
8. Szkliniarz, W. and Smolka, G., J. Mater. Proc. Tech. 53, 413 (1995).10.1016/0924-0136(95)01998-TGoogle Scholar
9. Green, D. W. and Maloney, J. O., eds. Perry‘s Chemical Engineer‘s Handbook, (New York, McGraw-Hill, 1984).Google Scholar
10. Greenwood, G. W. and Johnson, R. H., Proc. Roy. Soc. Lond. 283A, 403 (1965).Google Scholar
11. Schuh, C. and Dunand, D. C., Int. J. Plastic. (in print).Google Scholar
12. Sato, K., Nishimura, T., and Kimura, Y., Mater. Sci. Forum. 170–172, 207 (1994).10.4028/www.scientific.net/MSF.170-172.207Google Scholar
13. Ashby, M. F. and Dyson, B. F.. in Advances in Fracture Research, Fracture 84, edited by Valluri, S. R., et al. (Oxford, Pergamon, 1984) p. 3.Google Scholar
14. Cope, M. T. and Ridley, N., Mat. Sci. Technol. 2, 140 (1986).10.1179/mst.1986.2.2.140Google Scholar
15. Semiatin, S. L., Seetharaman, V., Ghosh, A. K., Shell, E. B., Simon, M. P., and Fagin, P. N., Mater. Sci. Eng. A256, 92 (1998).10.1016/S0921-5093(98)00814-4Google Scholar