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The location of tantalum atoms in Ni3(Al, Ta)

Published online by Cambridge University Press:  31 January 2011

Hui Lin  and
David P. Pope
Hui Lin
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
David P. Pope
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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Abstract

An x-ray powder diffraction method was used to determine the location of tantalum atoms in Ni3Al. A series of Ni3(Al, Ta) alloys were produced with tantalum contents ranging from 0.1 to 3.0 at.%. Fine powders with average particle sizes less than 80 μm were made from melt-spun ribbons by a grinding process. The values of the intensity of the (100) superlattice peak normalized to that of the (200) fundamental peak as a function of tantalum content agreed with the calculated values, assuming that tantalum atoms substitute on aluminum sites, not on nickel sites, and also assuming small amounts of anti-site defects exist in the ordered fee structure of Ni3(Al, Ta) alloys. It is concluded from our experiments that tantalum atoms substitute for aluminum in Ni3Al. The long-range order parameters thus calculated of the Ni3(Al, Ta) alloys are generally above 0.84 and below 0.95, except for Ni75Al24.8Ta0.2, at which composition the long-range order parameter is close to unity.

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Type
Articles
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Journal of Materials Research , Volume 5 , Issue 4 , April 1990 , pp. 763 - 768
Copyright
Copyright © Materials Research Society 1990

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References

REFERENCES

1Pope, D.P. and Ezz, S.S., Int. Metals Rev. 29, 136 (1984).Google Scholar
2Heredia, F. and Pope, D. P., in High-Temperature Ordered Intermetallic Alloys II, edited by Stoloff, N.S., Koch, C.C., Liu, C.T., and Izumi, O. (Mater. Res. Soc. Proc, Pittsburgh, PA, 1986), Vol. 60, pp. 213–220.Google Scholar
3Ochiai, S., Oya, Y., and Suzuki, T., Acta Metall. 32, 289 (1984).Google Scholar
4Drijver, J.W. and van der Woude, F., J. Phys. F: Metal Phys. 3, L206–L211 (October 1973).Google Scholar
5Miller, M. K. and Horton, J. A., in High-Temperature Ordered Intermetallic Alloys II, edited by Stoloff, N.S., Koch, C.C., Liu, C.T., and Izumi, O. (Mater. Res. Soc. Proc, Pittsburgh, PA, 1986), Vol. 60, pp. 117–122.Google Scholar
6Bentley, J., in Proc. of 44th Meeting of Electron Microscopy Society of America, edited by Bailey, G.W. (San Francisco Press, San Francisco, CA, 1986), p. 704.Google Scholar
7Miller, M. K. and Bentley, J., J. de Physique C7, 463 (1986).Google Scholar
8Williams, J.M., Bohn, H.G., Barrett, J.H., Liu, C.T., and Sjoreen, T.P., in High-Temperature Ordered Intermetallic Alloys II, edited by Stoloff, N. S., Koch, C. C., Liu, C.T., and Izumi, O. (Mater. Res. Soc. Proc, Pittsburgh, PA, 1986), Vol. 60, pp. 127–133.Google Scholar
9Lin, H., Seiberling, L.E., Lyman, P. E., and Pope, D. P., ibid., pp. 165–170.Google Scholar
10Bohn, H. G., Schumacher, R., and Vianden, R. J., ibid., pp. 123–126.Google Scholar
11Cullity, B. D., Elements of X-ray Diffraction, 2nd ed. (Addison-Wesley, 1978), p. 139.Google Scholar
12International Tables for X-ray Crystallography (Kynoch Press, Birmingham, England, 1962), Vol. Ill, p. 233.Google Scholar
13International Tables for X-ray Crystallography (Kynoch Press, Birmingham, England, 1974), Vol. IV, pp. 148–151.Google Scholar
14Levitin, V.V., Orzhitskaya, L.K., and Pospelova, L.I., Ukr. Fiz. Zh. 24 (8), 1155–1160 (1979).Google Scholar
15Aoki, K. and Izumi, O., Phys. Status Solidi (a) 32, 657 (1975).Google Scholar
16Paidar, V., Pope, D. P., and Vitek, V., Acta Metall. 32 (3), 435–448 (1984).Google Scholar
17Pope, D. P. and Garin, J. L., J. Appl. Cryst. 10, 14–17 (1977).Google Scholar