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Residual Stresses in Aluminum-Mullite (α-Alumina) Composites*

Published online by Cambridge University Press:  06 March 2019

Davor Balzar  and
Hassel Ledbetter
Davor Balzar
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80303
Hassel Ledbetter
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80303
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Abstract

We studied particle-reinforced 6061-aluminum-alloy composites with particle volume fractions ranging from 0 to 0.25. The mullite particles are approximately spherical and contain embedded α-alumina phase. We obtained lattice parameters of all three phases in the composites and starting materials by using Rietveld refinement of x-ray diffraction patterns. In all three phases stresses are tensile and approximately of the same magnitude, contradicting a requirement for mechanical equilibrium. Stresses increase with both increasing particle size and volume fraction. Measurements of extracted-from-composites particles showed no evidence of a possible chemical reaction at the matrix-particle interface. The matrix is [111] and [100] textured, but measurements of elastic constants reveal only small anisotropy. Thus, explanation of the mechanical-equilibrium violation remains uncertain.

Type
IX. Stress and Strain Determination by Diffraction Methods, Peak Broadening Analysis
Information
Advances in X-Ray Analysis , Volume 36: Forty-First Annual Conference on Applications of X-ray Analysis, August 3-7, 1992 , 1992 , pp. 489 - 497
Copyright
Copyright © International Centre for Diffraction Data 1992

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Footnotes

**

On leave from Department of Physics, Faculty of Metallurgy, University of Zagreb, 44000 Sisak, Croatia.

*

Noncopyrightable in United states

References

1. Angel, R. J. and Prewitt, C. T., Am. Mineral. 71: 1476 (1986).Google Scholar
2. Cohen, J. B., Pow. Diffr. 1: 15 (1986).Google Scholar
3. Noyan, I. C. and Cohen, J. B., “Residual stress”, Springer-Verlag, New York (1987).Google Scholar
4. Dolle, H., J. Appl. cryst. 12: 489 (1979).Google Scholar
5. Cameron, W. E., Am. ceram. Soc. Bull. 56: 1003 (1977).Google Scholar
6. Mizuno, M. and Saito, H., J. Am. Ceram. Soc. 72: 377 (1989).Google Scholar
7. Larson, A. C. and Von Dreele, R. B., “Los Alamos National Laboratory Rept. LAUR 86-748”, Los Alamos (1988).Google Scholar
8. Ledbetter, H. M. and Austin, M. W., Mater. Sci. Eng. 89: 53 (1987).Google Scholar
9. Reed, R. P. and Schramm, R. E., J. Appl. Phys. 45: (4705) 1974 .Google Scholar
10. Mura, T., “Micromechanics of Defects in solids”, Martinus Nijhoff, The Hague (1982).Google Scholar
11. Lee, J. K., Earmme, Y. Y., Aaronson, H. I., and Russel, K. C., Metal. Trans. 11A:1837(1980).Google Scholar