Hostname: page-component-78c5997874-v9fdk Total loading time: 0 Render date: 2024-11-05T13:45:55.175Z Has data issue: false hasContentIssue false
  • English
  • Français

Evolution of Ge Precipitate Morphology in Al

Published online by Cambridge University Press:  29 November 2013

U. Dahmen
Get access

Extract

Static electron microscopy provides views of microstructures frozen in time. For many problems, such snapshots give a clear picture of the material's characteristics after a particular processing step, but for other problems it is the evolution of the microstructure itself, its mechanisms and kinetics, that are important to understand. For this class of problem, in situ electron microscopy is an indispensable tool because it can provide real-time dynamic observations of processes, showing, for example, where dislocations nucleate, how a particle grows, by what mechanism and how fast an interface migrates. The major limitation to such experiments is that foils must be extremely thin to be electron transparent. The proximity of the free surfaces can have a strong effect on the dynamic equilibrium. For that reason, high-voltage electron microscopes are particularly useful for in situ TEM experiments. The greater penetration depth of high energy electrons makes it possible to observe processes in foils that are thick enough to avoid the dominant influence of the surfaces.

This article will describe some experiments in which the dynamic behavior of precipitates in a simple alloy system was examined during in situ temperature cycling in order to understand the effect of bicrystal anisotropy on the characteristics of interface motion.

Type
Materials Science in the Electron Microscope
Information
MRS Bulletin , Volume 19 , Issue 6 , June 1994 , pp. 22 - 25
Copyright
Copyright © Materials Research Society 1994

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.Burton, W.K., Cabrera, N., and Frank, F.C., Trans. R. Soc. London, Ser. A 243 (1951) p. 299.Google Scholar
2.Herring, C., in Structure and Properties of Solid Surfaces, edited by Gomer, R. and Smith, C.S. (University of Chicago Press, Chicago, 1953) p. 5.Google Scholar
3.Cahn, J.W., Acta Metall. 8 (1960) p. 554.CrossRefGoogle Scholar
4.Kalonji, G. and Cahn, J.W., J. Phys. (Paris), Coll. 43 (1982) p. C6–25.Google Scholar
5. For example, Pond, R.C., in Dislocations in Solids, Volume 8, edited by Nabarro, F.R.N. (North Holland, Amsterdam. 1989) p. 1.Google Scholar
6. For example, Khachaturyan, A.G., Semenovskaya, S.M., and Morris, J.W. Jr., Acta Metall. 36 (1988) p. 1563.CrossRefGoogle Scholar
7.Köster, U., Mater. Sci. Eng. 5 (1969) p. 174.CrossRefGoogle Scholar
8.Hugo, G.R. and Muddle, B.C., Mater. Forum 13 (1989) p. 147.Google Scholar
9.Douin, J., Dahmen, U., and Westmacott, K.H., Philos. Mag. B 63 (1991) p. 867.CrossRefGoogle Scholar
10.Hugo, G.R. and Muddle, B.C., Acta Metall. Mater 38 (1990) p. 351.CrossRefGoogle Scholar
11.Gouthama, and Kishore, , Proc. Int. Conf. Phase Transformations '87, edited by Lorimer, G.W. (1989); Gouthama, PhD thesis, Indian Institute of Science, 1989.Google Scholar
12.Lours, P., Westmacott, K.H., and Dahmen, U., in Structure & Properties of Interfaces in Materials, edited by Clark, W.A.T., Dahmen, U., and Briant, C.L. (Mater. Res. Soc. Symp. Proc. 238, Pittsburgh, PA, 1992) p. 207.Google Scholar
13.Hinderberger, S., Xiao, S.Q., K.H. MSA Proc. 53 (1994) in press.Google Scholar
14.Thangaraj, N., Hinderberger, S., Westmacott, K.H., and Dahmen, U.. in Advanced Metallization for ULSI Applications in 1993, edited by Favreau, D.P., Shacham-Diamand, Y., and Horiike, Y. (Mater. Res. Soc. Conf. Proc., Pittsburgh, PA, 1994) p. 247.Google Scholar