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

Published online by Cambridge University Press:  06 March 2019

Samuel D. Harkness  and
Robert W. Gould
Samuel D. Harkness
Affiliation:
Argonne National Laboratory, Argonne, Illinois
Robert W. Gould
Affiliation:
University of Florida, Gainesville, Florida
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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.

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 12: Seventeenth Annual Conference on Applications of X-ray Analysis, August 21-23, 1968 , 1968 , pp. 97 - 112
Copyright
Copyright © International Centre for Diffraction Data 1968

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Footnotes

*

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

*

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

References

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