Hostname: page-component-7c8c6479df-fqc5m Total loading time: 0 Render date: 2024-03-27T13:14:47.561Z Has data issue: false hasContentIssue false

Eutectoid Decomposition in Three Ti-Co Alloys

Published online by Cambridge University Press:  15 February 2011

E. Coomber
Affiliation:
School of Mechanical and Materials Engineering, University of Surrey, Guildford, UK
M. J. Whiting
Affiliation:
School of Mechanical and Materials Engineering, University of Surrey, Guildford, UK
P. Tsakiropoulos
Affiliation:
School of Mechanical and Materials Engineering, University of Surrey, Guildford, UK
Get access

Abstract

The mechanisms of eutectoid decomposition are important because of the widespread use of alloys which exhibit a eutectoid transformation. However, the transformation remains a matter of controversy for a number of reasons. The Ti-Co system is examined in order to test current understanding of eutectoid decomposition.

The high temperature beta phase can transform on cooling into several products - alpha plates, a non-lamellar mixture of alpha and Ti2Co which can be designated bainite, lamellar pearlite, spheroidal pearlite and Ti2Co allotriomorphs. In this study the high temperature beta phase was decomposed in hypoeutectoid, eutectoid and hypereutectoid alloys, for a range of undercoolings. The microstructure and crystallography of the transformation products was characterised by reflected light microscopy, SEM, XRD and TEM. The classification of the transformation products is discussed.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Diebold, T. P., Aaronson, H. I. and Franti, G. W., Metall. Trans. A, 9A, pp. 13391341 (1978).Google Scholar
2. Franti, G. W., Williams, J. C., and Aaronson, H.I., Metall. Trans. A, 9A, pp. 16411649 (1978).Google Scholar
3. Lee, H. J. and Aaronson, H. I., Acta Metall., 36, pp. 11411153 (1988).Google Scholar
4. Lee, H. J. and Aaronson, H. I., Acta Metall., 36, pp. 11551164 (1988).Google Scholar
5. Lee, H. J. and Aaronson, H. I., J. Mat. Sci., 23, pp. 150160 (1988).Google Scholar
6. Bhaskaran, T. A., Krishnan, R. V. and Ranganathan, S., Metall. Mat. Trans. A, 26A, pp. 13671377 (1995).Google Scholar
7. Hackney, S. A. and Shiflet, G. J. in Phase Transformations in Ferrous Alloys, edited by Marder, A. R and Goldstein, J. I., TMS-AIME, Warrendate, PA, pp. 237241 (1984).Google Scholar
8. Hackney, S. A. and Shiflet, G. J., Acta Metall., 35, 10071017 (1987).Google Scholar
9. , Zhou and Shiflet, G. J., Metall. Trans. A, 23A, pp. 12591269 (1992).Google Scholar
10. Beatty, J. H., Hackney, S. A. and Shiflet, G. J., Phil. Mag. A, 57, pp. 457466 (1988).Google Scholar
11. Whiting, M J. and Tsakiropoulos, P., Scripta Metall. Mat., 29, pp. 401406 (1993).Google Scholar
12. Whiting, M. J. and Tsakiropoulos, P., Mat. Sci. Tech. 11, pp. 717727 (1995).Google Scholar
13. Whiting, M. J. and Tsakiropoulos, P., Acta Mater. 45, pp. 20272042 (1997).Google Scholar
14. Hackney, S. A. and Shiflet, G. J., Acta Metall., 35, 10191028 (1987).Google Scholar
15. H. Lee, J., Spanos, G., Shiflet, G. J. and Aaronson, H. I., Acta Metall., 36, pp. 11291140 (1988).Google Scholar
16. Bhadeshia, H. K. D. H., Bainite in Steels, Institute of Materials(1992).Google Scholar