Diffusion of ⁶⁵Zn in Mg and in Mg–x Al solid solutions

Abstract

Heterodiffusion of 65Zn in Mg, Mg–x Al (x = 1.77, 3.9 and 9 wt% Al) and the commercial AZ91 alloy was studied in the temperature interval 498–848 K by serial sectioning and residual activity methods. The concentration and temperature dependence of the Zn bulk diffusion coefficient D is described by the relation D = exp (0.1c Al – 9.16) exp (–125.8 kJ mol–1/RT ) m2 s–1 (c Al – concentration of Al in wt%). The Zn grain boundary diffusivity P = sδD b (s – segregation factor, δ – grain boundary width and D b – diffusion coefficient in the grain boundary) was also determined and obeyed the Arrhenius law P = 7.2 × 10–15 exp (–46 kJ mol–1/RT ) m3 s–1. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Interdiffusion and impurity diffusion in polycrystalline Mg solid solution with Al or Zn

“…9 along with those reported by others. Neumann and Tuijn [8] summarized the tracer diffusion coefficients from isotopic tracer diffusion experiments carried out by Č ermák and Stoukal [24] and Lal [25]. Ganeshan et al [23] calculated Zn impurity diffusion coefficients based on first principles model, and Das et al [26] extrapolated impurity diffusion coefficients from interdiffusion studies.…”

Exact Model of Vacancy-Mediated Solute Transport in Magnesium

“…Magnesium alloys may substitute for aluminum and steel in aerospace and automotive industries with their higher specific strengths [9][10][11]. The growing interest in magnesium has driven experimental [12][13][14][15][16][17][18][19] and computational [20][21][22][23] studies of transport coefficients of the common Al and Zn solutes that improve strength and rare earth elements that improve ductility. Transport coefficients are fundamental inputs for models at the length and time scales of microstructure evolution.…”

Impurity Diffusion Coefficients of Al and Zn in Mg Determined from Solid‐to‐Solid Diffusion Couples

“…Figure 5 presents the impurity diffusion coefficients determined in this study with those determine in other studies. Čermák used isotopic tracer techniques to determine the Zn impurity diffusivity [9]. Brennan ascertained the Al impurity diffusion coefficients through thin film depth profiling procedures [10].…”