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Diffusion of Zinc in Two-Phase Mg-Al Alloy

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Abstract:

Coefficient of 65Zn heterodiffusion in Mg17Al12 intermetallic and in eutectic alloy Mg - 33.4 wt. % Al was measured in the temperature region 598 – 698 K using serial sectioning and residual activity methods. Diffusion coefficient of 65Zn in the intermetallic can be written as DI = 1.7 × 10-2 m2 s-1 exp (-155.0 kJ mol-1 / RT). At temperatures T ≥ 648 K, where the mean diffusion path was greater than the mean interlamellar distance in the eutectic, the effective diffusion coefficient Def = 2.7 × 10-2 m2 s-1 exp (-155.1 kJ mol-1 / RT) was evaluated. At two lower temperatures, the diffusion coefficients 65Zn in interphase boundaries were estimated: Db (623 K) = 1.6 × 10-12 m2 s-1 and Db (598 K) = 4.4 × 10-13 m2 s-1.

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Periodical:

Defect and Diffusion Forum (Volume 263)

Pages:

189-194

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.263.189

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Online since:

March 2007

Authors:

Ivo Stloukal, Jiří Čermák

Keywords:

Magnesium, Mg17Al12 Intermetallic Compound, Mg-33.4wt. % Al Eutectic Alloy, Zinc Diffusion

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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