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A Study of Guinier-Preston Zone Growth Kinetics Through the Use of X-Ray Small-Angle Scattering*

  • Samuel D. Harkness (a1) and Robert W. Gould (a2)

Abstract

The relation of the X-ray small-angle scattering parameters to the results of transmission electron microscopy for spherical Guinier-Preston zones was investigated. Experimentally, the Guinier radius is found to equal (<R7>/<R5>1/2) and the Porod radius to equal <R3>/<R2>. These results were theoretically predicted by Baur and Gerold, A log normal distribution was found to be in close agreement with the experimental data. The use of this distribution allowed the size-distribution curve of spherical Guinier-Preston zones to be constructed from the X-ray parameters and from a knowledge of the metastable miscibility gap. This approach is used to follow the evolution of size distribution in both Al-Ag and Al-Zn alloys. The application of this approach to nncleation and growth as well as redistribution processes is discussed. Growth paths are established from the size distribution evolution curves through an Nv> construction. A brief discussion of the technique is included.

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*

This work performed under Air Fores Contract No. AF-AFOSR-l142-66.

*

This work performed under Air Fores Contract No. AF-AFOSR-1142-66.

Footnotes

References

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1. Harkness, S. D., Gould, R. W., and Hren, J. J., “A Critical Evaluation of X-ray Small Angle Scattering Parameters”, Phil. Mag., in the press.
2. Gerold, V., “The Zone Formation in Aluminum-Zinc Alloys”, Phys. stat. solidi, 1: 37, 1961.
3. Baur, R. and Gerold, V., “Comparative X-ray and Electron Microscopy Studies of the Size of Guinier-Preston Zones in Aluminum- Silver”, Acta Met. 12: 1448, 1964.
4. Hilliard, J. E., “The Counting and Sizing of Partials in Transmission Microscopy”, TAIME 224: 906, 1962.
5. DeHoff, R. T., “The Estimation of Particle- Size Distributions from Simple Counting Measurements Made on Random Plane Sections”, TAME 233: 25, 1965.
6. Borelius, G., Defects in Crystalline Solids, 169, Phys. Soc, London 1955.
7. DeHoff, R. T., Private communication.

A Study of Guinier-Preston Zone Growth Kinetics Through the Use of X-Ray Small-Angle Scattering*

  • Samuel D. Harkness (a1) and Robert W. Gould (a2)

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