Accession Number : AD0708633

Title :   AN ANALYSIS OF INTRINSIC DIFFUSION AND INTERDIFFUSION IN SINGLE PHASE BINARY DIFFUSION COUPLES,

Corporate Author : IOWA STATE UNIV AMES ENGINEERING RESEARCH INST

Personal Author(s) : Patterson,John W.

Report Date : AUG 1969

Pagination or Media Count : 19

Abstract : The Matano method and Darken method for deducing interdiffusion coefficients and intrinsic diffusion coefficients are reexamined. It is shown that the coordinate system with the Matano interface as origin is inconsistent with Boltzmann's analysis. An alternative coordinate system with origin at the weld interface is proposed and is used to rederive the formulas for interdiffusion coefficients and intrinsic diffusion coefficients in terms of marker displacements and concentration profile data. The new formula for the interdiffusion coefficient has not been pointed out previously but the formulas deduced for the intrinsic diffusion coefficients are identical with results deduced independently by Heumann. (Author)

Descriptors :   (*SOLID STATE PHYSICS, DIFFUSION), INTEGRAL EQUATIONS, PARTIAL DIFFERENTIAL EQUATIONS, ANNEALING, WELDING

Subject Categories : Metallurgy and Metallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE