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Analysis of interdiffusion of Dy, Nd, and Pr in Mg

Published online by Cambridge University Press:  31 January 2011

Y. Xu ,
L. S. Chumbley ,
G. A. Weigelt  and
F. C. Laabs
Y. Xu
Affiliation:
Ames Laboratory and the Materials Science & Engineering Department, Iowa State University, Ames, Iowa 50011
L. S. Chumbley
Affiliation:
Ames Laboratory and the Materials Science & Engineering Department, Iowa State University, Ames, Iowa 50011
G. A. Weigelt
Affiliation:
Ames Laboratory and the Materials Science & Engineering Department, Iowa State University, Ames, Iowa 50011
F. C. Laabs
Affiliation:
Ames Laboratory and the Materials Science & Engineering Department, Iowa State University, Ames, Iowa 50011
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Abstract

The diffusion characteristics of Mg–rare-earth diffusion couples were studied. Cylinders of pure Mg and rare earth (Dy, Nd, and Pr) were abutted and annealed at 500 °C for 100 h or 300 h. Point-by-point composition profiles were collected starting in pure Mg, across the diffusion zone, and ending in the pure rare earth, using energy dispersive x-ray spectroscopy with a scanning electron microscope. The intermetallic phases that resulted due to diffusion were identified and compared to existing phase diagrams, for which the data is limited. For each diffusion couple, a plot of concentration versus distance perpendicular to the original plane of contact was obtained and analyzed using the Boltzman–Matano method. The interdiffusion coefficients for each set of phases were then calculated. The results show that diffusion through the intermetallic phases is much slower than is expected in a solid solution.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 11 , November 2001 , pp. 3287 - 3292
Copyright
Copyright © Materials Research Society 2001

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References

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