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Site selectivities and magnetic moments of V, Cr, and Mn doped in γ–TiAl alloys

Published online by Cambridge University Press:  31 January 2011

Suresh V. Babu ,
Arthur S. Pavlovic  and
Mohindar S. Seehra
Suresh V. Babu
Affiliation:
Physics Department, West Virginia University, P. O. Box 6315, Morgantown, West Virginia 26506-6315
Arthur S. Pavlovic
Affiliation:
Physics Department, West Virginia University, P. O. Box 6315, Morgantown, West Virginia 26506-6315
Mohindar S. Seehra
Affiliation:
Physics Department, West Virginia University, P. O. Box 6315, Morgantown, West Virginia 26506-6315
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Abstract

Magnetic and x-ray diffraction measurements on the system (Ti50Al50)100−xMx (M = V, Cr) are used to determine, respectively, the magnetic moment (associated with the dopants M) and changes in the lattice parameters. In addition, site selectivity by the dopants between the Ti and Al sites in the L10 structure is determined by measuring the changes with x (x = 0.12, 0.33, 0.71, and 1.21 at. % for V and x = 0.17, 0.41, 0.88, 1.14, and 1.91 at. % for Cr) the intensities of the (001) and (110) superlattice peaks. These results are compared with our earlier studies of the Mn-doped system that showed that the Mn substitutes for Ti and carries a moment of 2.3 μB/Mn atom. For V and Cr dopings, μ/atom decreases as x increases, the largest values being 1.01 μB/V and 0.55 μB/Cr at the lowest dopings. At the lowest x, V and Cr occupy the Ti sites, but for higher dopings, Ti and Al sites are occupied with about equal probability and μ approaches constant magnitudes of about 0.3 μB. These results suggest that only Ti occupancy results in a localized moment on the dopant. For Mn and V dopings, the magnitudes of the moments are in good agreement with a recent calculation of Khowash et al.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 5 , May 1993 , pp. 989 - 994
Copyright
Copyright © Materials Research Society 1993

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References

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