Skip to main content Accessibility help
×
Home

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

  • Davor Balzar (a1) and Hassel Ledbetter (a1)

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.

Copyright

Footnotes

Hide All
**

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

*

Noncopyrightable in United states

Footnotes

References

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

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed