Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-25T15:18:47.975Z Has data issue: false hasContentIssue false
  • English
  • Français

Cavitation in a Uniaxially deformed Superplastic Al-Mg Alloy

Published online by Cambridge University Press:  10 February 2011

D. H. Bae  and
A. K. Ghosh
D. H. Bae
Affiliation:
Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109
A. K. Ghosh
Affiliation:
Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109
Get access

Abstract

Cavitation caused by superplastic straining of a fine-grained Al-Mg-Mn-Cu alloy under uniaxial tension has been systematically evaluated. Tensile tests were conducted in the strain-rate range of 10−4s−1 to 10−2s−1 and in the temperature range of 450°C to 550°C. Measurements of the number and size of cavities were made by image analysis through optical microscopy on tested specimens. With increasing imposed strain, the cavity population density increases. Cavity growth has been found to be primarily due to the plastic deformation of the matrix. These results are characterized by the total volume fraction of cavities which is found to increase exponentially with strain. However, the dependencies of cavity volume fraction on strain-rate and temperature are not straightforward and the notion of just a few large cavities controlling the total cavity volume is not always true. Attempts to explain these complex dependencies have been carried out based on the concepts of debonding between the matrix and non-deformable particles, the continuous nucleation of new cavities, and plasticity-based cavity growth for large cavities.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 61
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. Ghosh, A. K. and Bae, D. H., Mat. Sci. Forum, Trans. Tech. Publications, Switzerland, 243–245, 89 (1997).Google Scholar
2. Ridley, N., Livesey, D. W. and Mukherjee, A. K., J. Mat. Sci., 19, 1321 (1984).10.1007/BF01120044Google Scholar
3. Pilling, J. and Ridley, N., Res. Mechanica, 23, 31 (1988).Google Scholar
4. Hull, D. and Rimmer, D. E., Philos. Mag., 4, 673 (1959).10.1080/14786435908243264Google Scholar
5. Bae, D. H. and Ghosh, A. K., to be submitted to Acta Mater., (1999).Google Scholar
6. Hancock, J. W., Metal Sci., 10, 319 (1976).10.1179/msc.1976.10.9.319Google Scholar
7. Cocks, A. C. F. and Ashby, M. F., Metal Sci., 14, 395 (1980).10.1179/030634580790441187Google Scholar
8. Stowell, M. J., Metal Sci., 17, 1 (1983).10.1179/030634583790427513Google Scholar
9. Pilling, J. and Ridley, N., Acta Metall., 34, 669 (1986).10.1016/0001-6160(86)90182-3Google Scholar
10. Stowell, M. J., Livesey, D. W. and Ridley, N., Acta Metall., 32, 35 (1984).10.1016/0001-6160(84)90199-8Google Scholar
11. Ghosh, A. K., Bae, D. H. and Semiatin, S. L., Mat. Sci. Forum, Trans. Tech. Publications, Switzerland, 304–306, 609 (1999).Google Scholar
12. Watanabe, H., Ohori, K. and Takeuchi, Y., Trans., ISIJ, 27, 730 (1987).10.2355/isijinternational1966.27.730Google Scholar
13. Friedman, P. A. and Ghosh, A. K., Metall. Trans., 27A, 3030 (1996).10.1007/BF02663852Google Scholar