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Orientation Relationships and Interfaces Between Low Symmetry Phases in The Yttria-Alumina System

Published online by Cambridge University Press:  15 February 2011

R. S. Hay
R. S. Hay*
Affiliation:
Wright Laboratory, Materials Directorate WPAFB, Dayton, OH 45433
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Abstract

Interphase boundaries and orientation relationships for yttria - yttrium-aluminum monoclinic and yttrium-aluminum monoclinic - yttrium-aluminum perovskite eutectics were observed by standard and high resolution TEM techniques. Three and five orientation relationships were found for each system, respectively. These eutectics all had a monoclinic phase and therefore had little potential for high symmetry overlap. In many cases low index planes with similer spacings or spacing multiples were parallel. However, presence of a monoclinic phase made definition of a three-dimensional low index near-CSL very difficult, so a combination of planes corresponding to reciprocal-space directions and zones corresponding to real-space directions were often needed for a geometric description of the orientation relationship. In general, two planes and the real-space direction corresponding to the zone for these planes described the orientation relationships. The disregistry between reciprocal-space coincidence sites was not localized by dislocations large enough to be visible.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 357: Symposium C – Structure and Properties of Interfaces in Ceramics , 1994 , 145
Copyright
Copyright © Materials Research Society 1995

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References

1. Royer, L., Bull. Soc. Fr. Mineral. Crist. 51, 7 (1928).Google Scholar
2. Dahmen, U., Acta metall. 30, 63 (1982).Google Scholar
3. Bollmann, W., Crystal Lattices, Interfaces, and Matrices, published by the author (1982).Google Scholar
4. Pond, R. C. and Vlachavas, D. S., Proc. R. Soc. Lond. A 386, 95 (1983).Google Scholar
5. Cahn, J. W. and Kalonji, G., Solid-Solid Phase Transformations (edited by Aaaronson, H. I., Laughlin, D. E., Sekerka, R. F., and Wayman, C. M.), pp. 3–14, Am. Inst. Min. Engrs., Philadelphia, PA (1982).Google Scholar
6. Bollmann, W. and Nissen, H.-U., Acta Cryst. A24, 546 (1968).Google Scholar
7. Hay, R. S. and Matson, L. E., Acta metall. mater. 39, [8] 1981 (1991).Google Scholar
8. Pond, R. C., Dislocations in Solids, edited by Nabarro, F. R. N., Elsevier Science Publishers B. V., pp. 1–66 (1989).Google Scholar
9. Jesser, W. A. and Merwe, J. H. van der, Dislocations in Solids, edited by Nabarro, F. R. N., Elsevier Science Publishers B. V., pp. 423–460 (1989).Google Scholar
10. Zhang, W.-Z. and Purdy, G. R., Phil. Mag. A68, [2] 279 (1993).Google Scholar
11. Brandon, D. G., Ralph, B., Ranganathan, S., and Wald, M. S., Acta metall. 12, 813 (1964).Google Scholar
12. Sutton, A. P. and Balluffi, R. W., Acta metall. 35, 2177 (1987).Google Scholar
13. Read, W. T. and Shockley, W., Phys. Rev. 78, 275 (1950).Google Scholar
14. Sutton, A. P., Phil. Mag. Let. 59 [2], 53 (1989).Google Scholar
15. Frost, H. J., Spaepen, F., and Ashby, M. F., Scripta metall. 16, 1165 (1982).Google Scholar
16. , Swanson and , Fuyat, NBS Circular 539, Vol. III, 28 (1954).Google Scholar
17. Reed, J. W. and Chase, A. B., Acta Cryst. 15, 812 (1962).Google Scholar
18. Lehmann, M. S., Christensen, A. N., Fjellvag, H., Feidenhans'l, R., and Nielsen, M., J. Appl. Cryst. 20, 123 (1987).Google Scholar
19. Christenesen, A. N. and Hazell, R. G., Acta Chem. Scan. 45, 226 (1991).Google Scholar
20. Geller, S. and Wood, E. A., Acta Cryst. 9, 563 (1956).Google Scholar
21. Diehl, R. and Brandt, G., Mater. Res. Bull. X, 85 (1975).Google Scholar
22. Yamane, H., Omori, M., Okubo, A., and Hirai, T., J. Am. Ceram. Soc. 76 [9], 2382 (1993).Google Scholar
23. Takizawa, H., Shimada, M., Shimoyashiki, K., and Endo, T., J. Am. Ceram. Soc. 77 [9], 2489 (1994).Google Scholar