Metallurgical and Materials Transactions A

, Volume 45, Issue 9, pp 3800–3805 | Cite as

The Diffusion Coefficient of Scandium in Dilute Aluminum-Scandium Alloys

  • Marcel A. Kerkove
  • Thomas D. Wood
  • Paul G. Sanders
  • Stephen L. Kampe
  • Douglas Swenson
Article

Abstract

The diffusion coefficient of Sc in dilute Al-Sc alloys has been determined at 748 K, 823 K, and 898 K (475 °C, 550 °C, and 625 °C, respectively) using semi-infinite diffusion couples. Good agreement was found between the results of the present study and both the higher temperature, direct measurements and lower temperature, indirect measurements of these coefficients reported previously in the literature. The temperature-dependent diffusion coefficient equation derived from the data obtained in the present investigation was found to be \( D \left( {{\text{m}}^{2} /{\text{s}}} \right) = \left( {2.34 \pm 2.16} \right) \times 10^{ - 4} \left( {{\text{m}}^{2} /{\text{s}}} \right) { \exp }\left( {\frac{{ - \left( {167 \pm 6} \right) \left( {{\text{kJ}}/{\text{mol}}} \right)}}{RT}} \right). \) Combining these results with data from the literature and fitting all data simultaneously to an Arrhenius relationship yielded the expression \( D \left( {{\text{m}}^{2} /{\text{s}}} \right) = \left( {2.65 \pm 0.84} \right) \times 10^{ - 4} \left( {{\text{m}}^{2} /{\text{s}}} \right) { \exp }\left( {\frac{{ - \left( {168 \pm 2} \right) \left( {{\text{kJ}}/{\text{mol}}} \right)}}{RT}} \right). \) In each equation given above, R is 0.0083144 kJ/mol K, T is in Kelvin, and the uncertainties are ±1 standard error.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2014

Authors and Affiliations

  • Marcel A. Kerkove
    • 1
  • Thomas D. Wood
    • 1
  • Paul G. Sanders
    • 1
  • Stephen L. Kampe
    • 1
  • Douglas Swenson
    • 1
  1. 1.Department of Materials Science and EngineeringMichigan Technological UniversityHoughtonUSA

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