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High Temperature Oxidation of β-NiAl

Published online by Cambridge University Press:  21 February 2011

Joseph K. Doychak ,
T. E. Mitchell  and
J. L. Smialek
Joseph K. Doychak
Affiliation:
Dept. of Metallurgy and Matl's Sci., Case Western Reserve University Cleveland, OH 44106
T. E. Mitchell
Affiliation:
Dept. of Metallurgy and Matl's Sci., Case Western Reserve University Cleveland, OH 44106
J. L. Smialek
Affiliation:
NASA Lewis Research Center, Cleveland, OH 44135
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Abstract

The oxidation of single crystal β-NiAl has been studied primarily using electron microscopy. Oriented metastable Al2O3 phases form during transient oxidation at 800°C. Specific orientation relationships exist on all metal orientations studied and are a result of the small mismatch along aligned close-packed directions in the cation sublattices of the metal and oxide. Transformation of the metastable Al2O3, phases at 1100°C results in an oxide morphology described as the “lacey” structure of α-Al2O3 scales. This structure results from impingement of oriented patchei α a-Al2O3 as the transformation initiates and moves radially parallel to the sugfhce. Scale growth occurs by diffusion along high angle grain boundaries. A drastic reduction in oxidation rate accompanies the change in oxide morphology.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 39: Symposium G – High-Temperature Ordered Intermetallic Alloys I , 1984 , 475
Copyright
Copyright © Materials Research Society 1985

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References

REFERENCES

1. Pettit, F.S., Trans. Met. Soc. AIME, 239, p. 1296 (1967).Google Scholar
2. Young, E.W.A. and de Wit, J.H.W., Surface and Interface Analysis, 5, No. 5, p. 177 (1983).Google Scholar
3. Tien, J.K. and Pettit, F.S., Met. Trans., 3, p. 1587 (1972).CrossRefGoogle Scholar
4. Kear, B.H., Pettit, F.S., Fornwalt, D.E. and Lemaire, L.P., Oxid. Met., 3, p. 557 (1971).Google Scholar
5. Smialek, J.L.: “Microstructure of Al2O3 Scales Formed on NiCrAl Alloys,” Ph.D. Thesis, Case Western Reserve University, Cleveland, OH, 1981.Google Scholar
6. Gitzen, W.H.: Alumina as a Ceramic Material, American Ceramic Society, Columbus, OH, 1970.Google Scholar
7. Verwey, E.J.W., J. Chem. Phys., 3, p.592 (1935).Google Scholar
8. Donlon, W.T., Mitchell, T.E. and Heuer, A.H., J. Mat. Sci., 17, p.1389 (1982).CrossRefGoogle Scholar
9. Whittle, D.P. and Stringer, J., Phil. Trans. Roy. Soc., A 295, p. 309 (1980).Google Scholar
10. Doychak, J.K. in: Proceedings of the 42nd Annual Meeting of the Electron Microscopy Society of America, Detroit, MI, 1984, p. 598.Google Scholar
11. Doychak, J.K.: “The Transient Oxidation of Single Crystal NiAl + Zr,” M.S. Thesis, Case Western Reserve University, Cleveland, OH, 1984.Google Scholar
12. Doychak, J.K., Smialek, J.L. and MItchell, T.E. in: Proceedings of the 9th International Congress on Metallic Corrosion, Toronto,1984, Vol.1, p. 35.Google Scholar
13. Hindam, H.M. and Smeltzer, W.W., J. Electrochem. Soc., 127, No. 7, p. 1622 (1980).Google Scholar
14. Rybicki, G.C. and Smialek, J.L.: NASA Lewis Research Center, 1982, to be published.Google Scholar
15. Sheasby, J.S. and Jory, D.B., Oxid. Met., 12, No. 6, p. 527 (1978).Google Scholar
16. Felten, E.J. and Pettit, F.S., Oxid. Met., 10, No. 3, p. 189 (1976).Google Scholar
17. Hindam, H.M. and Smeltzer, W.W., J. Electrochem. Soc., 127, No. 7, p. 1630 (1980).CrossRefGoogle Scholar
18. Basu, S.N.: “Analysis Techniques for Tracer Studies of Oxidation,” M.S. Thesis, Case Western Reserve University, Cleveland, OH, 1985.Google Scholar