Accession Number : AD0770076

Title :   Ternary Diffusion.

Descriptive Note : Final technical rept.,


Personal Author(s) : DeHoff,Robert T. ; Guy,Albert G.

Report Date : JUL 1971

Pagination or Media Count : 80

Abstract : A new viewpoint on the analysis of diffusion behavior in ternary systems is presented, in which the matrix of diffusion coefficients is replaced by the 'relative penetration tendencies' of the three species. This procedure makes the calculation of the diffusion path and Kirkendall shift for a given ternary couple very simple and straightforward: this in turn facilitates the calculation of a complete pattern of composition paths and Kirkendall shifts on the Gibbs triangle for any given model of relative penetration tendencies of the components. The availability of such patterns makes it easy to recognize and model the relative penetration tendencies in systems for which the composition path pattern has been experimentally determined. The approach is then successfully applied to generating relatively simple penetration tendency models which reproduce experimental composition path and Kirkendall shift patterns in Cu-Ni-Zn, Fe-Ni-Co, and Cu-Ag-Au. (Modified author abstract)

Descriptors :   (*Alloys, *Diffusion), Copper alloys, Nickel alloys, Zinc alloys, Iron alloys, Cobalt alloys, Silver alloys, Gold alloys, Crystal structure, Phase diagrams

Subject Categories : Physical Chemistry
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE