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Determination of Particle Size Distribution in a Dispersion Hardened Nickel Alloy Using Small Angle X-Ray Scattering

  • R. W. Gould (a1) and S. R. Bates (a1)

Abstract

It has been recently shown that particle size distributions can be determined from small angle x-ray scattering data. Size distributions have previously been measured in aluminum-zinc and aluminum-silver alloys containing spherical Guinier-Preston zones. Inorder to obtain the size distribution it is only necessary to calculate the Guinier radius and the Porod radius.

Dispersion hardened nickel alloys containing small spherical particles of thoria appear to be amenable to this type of analysis. A nickel-20% chromium-2% ThO2 alloy was selected for this study. The particle size distribution obtained by small angle x-ray scattering is compared with the transmission electron microscopy results found in the literature.

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1. Guinier, A. et al, Small Angle Scattering of X-rays, J. Wiley and Sons, New York, 1955.
2. Gerold, V., “Application of Small Angle X-ray Scattering to Problems in Physical Metallurgy and Metal Physics,” in H. Brumberger, Editor, Small Angle X-ray Scattering, Gorden and Breach, New York, 1955, p. 277317.
3. Letcher, J. H. and Schmidt, P. W., “Small Angle X-ray Scattering Determination of Particle-Diameter Distributions in Polydisperse Suspensions of Spherical Partials,” J. Applied Physics 37:649655, 1966.
4. Harkness, S. D., Gould, R. W. and Hren, J. J., “A Critical Evaluation of X-ray Small Angle Scattering Parameters by Transmission Electron Microscopy: GP Zones in Al Alloys,” Phil. Mag., 1968 (accepted for publication).
5. Baur, R. and Gerold, V., “Vergleichende röntgengraphische und electron mikroskopische Untersuchungen der Grösse von Guinier-Preston-Zonen in Aluminium-Silber,” Acta Met. 12: 14491453, 1964.
6. Bousquet, P. L., Masters Degree Thesis, Department of Metallurgical and Materials Engineering, University of Florida, 1968.
7. Gerold, V., “Die Zonenbildung in Aluminium-Zink Legierungen,” Physica Status Solidi 1:3749, 1961.
8. Gould, R. W. and Sanvald, R. C., “A Computer Program for Simple Small Angle Scattering Calculations,” Norelco Reporter XIV: 2224, 1967.
9. Wilcox, B. A., Clauer, A. H. and McCain, W. S., “Creep and Creep Fracture of a Ni-20Cr-2ThO2 Alloy,” Trans. AIME 239:17911795, 1967
10. Mee, P. B. and Sinclair, R. A., “Cold Rolling and Annealing Behavior in Nickel-Thoria Sheet, with Particular Reference to Preferred-Orientation Development,” J. Inst. Metals 94:319326, 1966.

Determination of Particle Size Distribution in a Dispersion Hardened Nickel Alloy Using Small Angle X-Ray Scattering

  • R. W. Gould (a1) and S. R. Bates (a1)

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