Diffusion Measurements of 67Ga in Polycrystalline Magnesium

Abstract:

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Gallium grain boundary (GB) diffusion of Ga in polycrystalline magnesium was investigated by radiotracer residual activity technique using 67Ga isotope. The diffusion measurements were carried out under conditions of Harrison’s B-type kinetics in temperature range 639 – 872 K. An approximate evaluation procedure was proposed to calculate both volume diffusion coefficient Dv and GB diffusivity P = s dDb (s is the segregation factor, d the GB width and Db the GB diffusion coefficient). The obtained results showed the following linear Arrhenius relationships: Dv = 1.2 × 10-4 × exp (–134.3 kJ mol-1/RT) m2 s-1 and P = 3.8 × 10-9 × exp (–94.9 kJ mol-1/RT) m3 s-1, where R is universal gas constant and T the temperature. Obtained results were compared with literature data on Mg self-diffusion and with In impurity diffusion in magnesium.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 237-240)

Edited by:

M. Danielewski, R. Filipek, R. Kozubski, W. Kucza, P. Zieba, Z. Zurek

Pages:

1287-1292

DOI:

10.4028/www.scientific.net/DDF.237-240.1287

Citation:

I. Stloukal and J. Čermák, "Diffusion Measurements of 67Ga in Polycrystalline Magnesium", Defect and Diffusion Forum, Vols. 237-240, pp. 1287-1292, 2005

Online since:

April 2005

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$35.00

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