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Site selectivity of Mn atoms in γ–TiAl alloys determined by x-ray scattering

  • V. Suresh Babu (a1) and Mohindar S. Seehra (a1)

Abstract

The relative variations of the intensities of the superlattice peaks in the x-ray scattering of Ti50−xMnxAl50 alloys (x = 0, 0.77, 1.85, and 3.30) are used to determine the site occupancy by Mn atoms. It is concluded that up to x = 1.85, Mn occupies the Ti sites whereas for x = 3.30, some Al sites may also be occupied in the L10 structure of γ–TiAl alloys.

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1 See, e.g., High Temperature Ordered Intermetallic Alloys III, edited by Liu, C. T., Taub, A. I., Stoloff, N. S., and Koch, C. C. (Mater. Res. Soc. Symp. Proc. 133, Pittsburgh, PA, 1989).
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4Tsujimoto, T. and Hashimoto, K., Ref. 1, page 391.
5Chubb, S. R., Papaconstantopoulos, D. A., and Klein, B. M., Phys. Rev. B 38, 12120 (1988).
6Lin, H. and Pope, D. P., J. Mater. Res. 5, 763 (1990).
7Cullity, B. D., Elements of X-Ray Diffraction, 2nd ed. (Addison-Wesley, 1978), p. 139.
8International Tables for X-Ray Crystallography (Kynoch Press, Birmingham, England), Vol. III, p. 233 and Vol. IV, pp. 71–91.
9Coletti, J., Babu, V. Suresh, Pavlovic, A. S., and Seehra, M. S., Phys. Rev. B (in press).
10Khowash, P. K., Price, D. L., and Cooper, B. R., Phys. Rev. B (submitted for publication).

Site selectivity of Mn atoms in γ–TiAl alloys determined by x-ray scattering

  • V. Suresh Babu (a1) and Mohindar S. Seehra (a1)

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