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The Effect of Surface Oxide Films on the Mechanical Behavior of NiAl

Published online by Cambridge University Press:  21 February 2011

R. D. Noebe  and
R. Gibala
R. D. Noebe
Affiliation:
The University of Michigan, Dept. of Materials and Metallurgical Engineering, Ann Arbor, MI 48109
R. Gibala
Affiliation:
The University of Michigan, Dept. of Materials and Metallurgical Engineering, Ann Arbor, MI 48109
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Abstract

Thin surface films have been shown to enhance the ductility and decrease the flow stress of several body-centered cubic metals at temperatures T < 0.2 Tm. The origin of this effect lies in the large difference in the intrinsic mobilities of edge and screw dislocations in body-centered cubic crystals. B2 ordered intermetallic alloys, although simple cubic in structure, are based on the body-centered cubic structure and have dislocation core structures, dislocation mobilities and temperature and orientation dependent deformation qualitatively similar to that of bcc metals. This investigation was initiated to examine possible effects of surface films on the mechanical behavior of B2 ordered intermetallic alloys, using oxidized NiAl as the initial material for investigation. Experiments were performed on an impure non-stoichiometric (47.1 at.% Al) single crystal material with an axial orientation near [123]. Surface film softening was observed at room temperature in compression at a strain rate of 2 x 10-4 s-1. Flow stresses of the oxide coated crystals were as much as 20% lower than those of identically prepared uncoated crystals. The strains to fracture of coated specimens were larger than those of uncoated specimens and in a few instances the ductility enhancement was as much as four times. Of the several oxides examined, the largest softening effects were found for a thermally deposited delta-A1203 film formed at 1000 °C for 1 hour. The current results for NiAl are compared to results previously obtained for bcc metals. Experiments which could further enhance the film softening effects observed in B2 ordered intermetallic alloys are suggested.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 39: Symposium G – High-Temperature Ordered Intermetallic Alloys I , 1984 , 319
Copyright
Copyright © Materials Research Society 1985

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References

REFERENCES

1. Liu, C.T. and Steigler, J.O., Science 226, 636(1984).CrossRefGoogle Scholar
2. Hindman, H. and Whittle, D.P., Oxid. Met. 18, 245(1982).Google Scholar
3. Westbrook, J.H., J. Electrochem. Soc. 103, 63654(1956).Google Scholar
4. Sethi, V.K. and Gibala, R., Scripta Met. 9, 527(1975).CrossRefGoogle Scholar
5. Sethi, V.K. and Gibala, R., Thin Solid FiTms 39, 79(1976).CrossRefGoogle Scholar
6. Sethi, V.K. and Gibala, R., Acta Met. 25, 636321(1977).CrossRefGoogle Scholar
7. Sethi, V.K. and Gibala, R., in Surface Effects in Crystal Plasticity, Latanision, R.M. and Fourie, J.T. (eds.), p. 599, Noordoff, Int. Pub., Reading, Mass.(1977).Google Scholar
8. Sethi, V.K. and Gibala, R., Phil. Mag. 37, 419(1978).CrossRefGoogle Scholar
9. Talia, J.E., Fernandez, L. and Gibala, R., Scripta Met. 12, 737(1978).CrossRefGoogle Scholar
10. Tottori, T., Talia, J.E. and Gibala, R., Scripta Met. 14,-1153(1980).CrossRefGoogle Scholar
11. Kojima, K., Kobayashi, S. and Meshii, M., Scripta Met. 10, 347(1976).CrossRefGoogle Scholar
12. Kobayashi, S. and Meshii, M., Acta Met. 25, 1515(1977)CrossRefGoogle Scholar
13. Kojima, K. and Meshii, M., phys. stat. sol. (a) 39, 491(1977).CrossRefGoogle Scholar
14. Christian, J.W., Met. Trans. 14A, 1237(1983).CrossRefGoogle Scholar
15. Yamaguchi, M., in Mechanical Properties of BCC Metals, Meshii, M. (ed.), p. 31, The Metallurgical Society of AIME, Warrendale, Pa. (1982).Google Scholar
16. Pascoe, R.T. and Newey, C.W.A., Metal Sci. J. 5, 50(1971).CrossRefGoogle Scholar
17. Takeuchi, S., Phil. Mag. 41, 541(1980).CrossRefGoogle Scholar
18. Doychak, J.K., Thesis, M.S., Case Western Reserve, Cleveland, Ohio (1984).Google Scholar
19. Rybicki, G.C., NASA Lewis Research Center, Cleveland, Ohio (personal com.).Google Scholar
20. Lowell, C. and Santoro, G., NASA TN D-6838 (1972).Google Scholar
21. Hindman, H.M. and Smeltzer, W.W., J. Electrom. Soc. 127, 1630(1980).Google Scholar
22. Talia, J.E., Fernandez, L., Sethi, V.K. and Gibala, R., Fifth Int. Conf. on Strength of Metals and Alloys, p. 127, Pergamon Press, New York (1979).CrossRefGoogle Scholar
23. Christian, J.W., Proc. Second Int. Conf Strenath of Metals and Alloys, p. 31, ASM(1970).Google Scholar
24. Leslie, W.C., Met. Trans. 3, 5(1972).CrossRefGoogle Scholar
25. Sato, A. and Meshii, M., Scripta Met. 8, 851(1974).CrossRefGoogle Scholar
26. Spitzig, W.A. and Keh, A.S., Acta Met. 18, 611(1970).CrossRefGoogle Scholar
27. Sato, A. and Meshii, M., phys stat. sol. (a) 28, 561(1975).CrossRefGoogle Scholar
28. Yamaguchi, M. and Vitek, V., J. Phys. F: Metal Physics 3, 523(1973).CrossRefGoogle Scholar
29. Yamaguchi, M. and Vitek, V., J. Phys. F: Metal Physics 3, 537(1973).CrossRefGoogle Scholar
30. Yang, W., Dodd, R.A. and Strutt, P.R., Met. Trans. 3, 2049(1972).CrossRefGoogle Scholar
31. Tisone, T.C., Marshall, G.W. and Brittain, J.O., J. Appl. Physics 39, 3714 (1972).CrossRefGoogle Scholar
32. Polvani, R.S., Strutt, P.R. and Kear, B.H., Proc. 4th Int. Conf. on Strength of Metals and Alloys, Vol.1, p. 314(1976).Google Scholar
33. Yang, W.J. and Dodd, R.A., Met. Sci. J. 7, 41(1973).CrossRefGoogle Scholar
34. Liu, H.C. and Mitchell, T.E., J. Nuc. Mat. 107, 318(1982).CrossRefGoogle Scholar
35. Parthasarathi, A. and Fraser, H.L., Phil. Mag. A 50, 89(1984).CrossRefGoogle Scholar
36. Lautenschlager, E.P., Tisone, T.C. and Brittain, J.O., phys. stat. sol. 20, 443(1967).CrossRefGoogle Scholar
37. Ball, A. and Smallman, R.E., Acta Met. 14, 1517(1966).CrossRefGoogle Scholar
38. Wasilewski, R.J., Butler, S.R. and Hanlon, J.E., Trans. Met. Soc. AIME 239, 1351(1967).Google Scholar
39. Loretto, M.H. and Wasilewski, R.J., Phil. Mag. 23, 1131(1971).CrossRefGoogle Scholar
40. Bevk, J., Dodd, R.A. and Strutt, P.R., Met. Trans. 4, 159(1973).CrossRefGoogle Scholar
41. Fraser, H.L., Smallman, R.E. and Loretto, M.H., PhiT. Mag. 28, 651(1973).CrossRefGoogle Scholar
42. Sethi, V.K., Gibala, R. and Heuer, A.H., Amr. Cer. Soc. Bull. 57, 308(1978).Google Scholar
43. Pawel, R.E. and Campbell, J.J., Acta Met. 14, 1827(1966).CrossRefGoogle Scholar
44. Cathcart, J.V. (ed.), Stress Effects and The Oxidation of Metals, AIME, New York (1975).Google Scholar
45. Ashby, M.F., in Strengthening Mechanisms in Crystals, Kelly, A. and Nicholson, R.B. (eds.), p. 137, Halsted/Wiley, New York (1971).Google Scholar
46. Tottori, T., Thesis, M.S., Case Western Reserve U., Cleveland, OH (1982).Google Scholar
47. Talia, J.E., Ph.D. Thesis, Case Western Reserve U., Cleveland, OH (1980).Google Scholar
48. Lixin, Z., Yaode, Y., Liguang, L., Qi, Z., Bingshen, Z., in High Temperature Corrosion, Rapp, R.A. (ed.), NACE, Houston, Texas (1983).Google Scholar
49. Oxx, G.D., Prod. Eng., Jan. 20 (1958). A.J. Kumnick and L.J. Ebert, NASA Report No. NAG 3–39(1981).Google Scholar
50. Kingery, W.D., Bowen, H.K. and Uhlmann, D.R., Introduction to Ceramics, 2nd. ed., John Wiley and Sons, New York(1976).Google Scholar