Paper Title:
Cross Interdiffusion Coefficients in Nickel- and Iron-Based Ternary Alloys
  Abstract

It is known that two main interdiffusion coefficients, ık Dii and ık Djj , as well as two cross interdiffusion coefficients, ık Dij and ık Dji , are necessary for understanding the atomic diffusion for ternary system. Here, k is the host element of ternary system, and i and j are solute elements. These four interdiffusion coefficients are obtained from a series of experiments using two kinds of ternary diffusion couples. In general, it is believed that ık Dij and ık Dji indicate the same sign to each other, but there are a lot of experimental data showing that ık Dij and ık Dji indicate opposite sign [1]. In such a case, the physical meaning of the cross interdiffusion coefficient has not always been understood thoroughly. The purposes of this study are to measure the interdiffusion coefficients by a series of experiments and to elucidate the physical meaning of the two cross interdiffusion coefficients on the basis of the consideration about the relationship between the thermodynamic functions and the cross interdiffusion coefficients. It is concluded that ık Dij exhibits the opposite sign to ık Dji without contradicting the Onsarger’s reciprocity theorem when the ( 2 2 ) c j ∂ G ∂c shows the opposite sign to ( 2 2 ) c i ∂ G ∂c . Here, c G is Gibbs free energy of the ternary system.

  Info
Periodical
Defect and Diffusion Forum (Volumes 273-276)
Edited by
Andreas Öchsner and Graeme E. Murch
Pages
419-424
DOI
10.4028/www.scientific.net/DDF.273-276.419
Citation
Y. Murata, S. Sakurai, E. Mabruri, T. Koyama, M. Morinaga , "Cross Interdiffusion Coefficients in Nickel- and Iron-Based Ternary Alloys", Defect and Diffusion Forum, Vols. 273-276, pp. 419-424, 2008
Online since
February 2008
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