Hostname: page-component-745bb68f8f-mzp66 Total loading time: 0 Render date: 2025-01-27T03:03:01.968Z Has data issue: false hasContentIssue false
  • English
  • Français

Shape Transformations of Ge Precipitates in Al

Published online by Cambridge University Press:  25 February 2011

P. Lours ,
K. H. Westmacott  and
U. Dahmen
P. Lours
Affiliation:
National Center for Electron Microscopy, Materials Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, Ca 94720
K. H. Westmacott
Affiliation:
National Center for Electron Microscopy, Materials Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, Ca 94720
U. Dahmen
Affiliation:
National Center for Electron Microscopy, Materials Sciences Division, Lawrence Berkeley Laboratory, University of California, Berkeley, Ca 94720
Get access

Abstract

Ge precipitates in Al-Ge alloys have been observed to undergo a transformation in shape during in-situ temperature cycling in a high voltage electron microscope. Octahedral precipitates with a parallel-cube orientation relationship spheroidized on heating and refaceted to the octahedral shape on cooling. This shape transformation was essentially conservative if the temperature excursions were kept small. These observations are discussed in terms of an interface roughening transformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 207
Copyright
Copyright © Materials Research Society 1992

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

REFERENCES

1. Köster, U., Mat. Sci. Eng. 5, 174 (1969)CrossRefGoogle Scholar
2. Hugo, G.R. and Muddle, B.C., Mat. Forum 13, 147 (1989)Google Scholar
3. Douin, J., Dahmen, U. and Westmacott, K.H., Phil. Mag. B 63, 867 (1991)Google Scholar
4. Hugo, G.R. and Muddle, B.C., Acta Metall, and Mat., 28, 351 (1990)CrossRefGoogle Scholar
5. Gouthama, and Kishore, , Proc. Int. Conference on Phase Transformations '87, Ed. Lorimer, G.W. (1989), andGoogle Scholar
Gouthama, , Ph.D. Thesis, Indian Inst. of Sci., Bangalore (1989)Google Scholar
6. Stephens, D.E. and Purdy, G.R., Acta Met. 23, 1343 (1975)CrossRefGoogle Scholar
7. Alexander, K.B., LeGoues, F.K., Aaronson, H.I. and Laughlin, D.E., Acta Met. 32, 2241 (1984)Google Scholar
8. Aikin, R.M. Jr, Plichta, M.R., Acta Met. 38. 77 (1990)Google Scholar
9. Merle, P. and Doherty, R.D., Scr. Met. 16, 357 (1982)Google Scholar
10. Zhang, D.L. and Cantor, B., Phil. Mag. A 62, 557, (1990)Google Scholar
11. Gräbæk, L., Bohr, J., Andersen, H.H., Johanson, A., Johnson, E. and Sarholt-Kristensen, L., Phys. Rev. B 45, Feb. 1992 Google Scholar
12. Moore, K.I., Chattopadhyay, K. and Cantor, B., Proc. Roy. Soc. London A 414, 499 (1987)Google Scholar
13. Saka, H., Nishikawa, Y. and Imura, T., Phil. Mag. A 57, 895 (1988)CrossRefGoogle Scholar
14. Andersen, H.H., Bohr, J., Johanson, A., Johnson, E., Sarholt-Kristensen, L. and Surganov, V., Phys. Rev. Lett. 52, 1589 (1987)Google Scholar