Movement of Multiple Markers in Cu/Zn Multiple Phase Diffusion Couples and Its Numerical Analysis

• Published in: Journal of phase equilibria and diffusion Vol. 37; no. 5; pp. 548 - 555
• Main Authors: Shimozaki, Toshitada, Lee, Je-hyun, Lee, Chan-Gyu
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-10-2016; Springer Nature B.V
• Subjects: Alignment; Alumina; Annealing; Ceramics; Composites; Constants; Crystallography and Scattering Methods; Diffusion; Diffusion annealing; Diffusion coefficient; Diffusion layers; Engineering Thermodynamics; Gamma phase; Glass; Heat and Mass Transfer; Markers; Mathematical models; Metallic Materials; Natural Materials; Numerical analysis; Physics; Physics and Astronomy; Stainless steel; Thermodynamics; interdiffusion; Kirkendall effect; frame of reference; binary system; diffusivity measurements
• ISSN: 1547-7037; 1863-7345; 1934-7243
• DOI: 10.1007/s11669-016-0479-6

Movement of multiple markers (M-Ms) embedded in the Cu end member of a Cu/Zn multiple phases diffusion couple (M-couple) has been experimentally investigated at 623 K and the alignment of the M-Ms after diffusion anneal was reproduced by the numerical analysis that the authors have previously reported. Two intermediate phases, γ and ɛ, were found in the Cu/Zn M-couple. The M-Ms bent toward Zn side at Cu/γ phase interface and show almost a linear line in the γ phase. They again bent at γ/ɛ interface toward Zn side. The Kirkendall marker position,
X
k
, locates in the ɛ phase layer. From this result, ratio,
R
 = 
D
Zn
/
D
Cu
, of the intrinsic diffusion coefficients with respect to the mole fixed frame of reference was determined to be about 46 at
X
k
. On the assumption of a constant value of
R
 = 46 in the ɛ phase and appropriate constant values of
R
 = 10-1000 in the γ phase, alignments of M-Ms after diffusion anneal were numerically reproduced. By fitting the alignment of M-Ms obtained numerically on the experimental result, the value
R
in γ phase is estimated to be very large value of 500.