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Diffusion of 65 Zn in Mg and in Mg– x Al solid solutions
Author(s) -
Čermák Jiří,
Stloukal Ivo
Publication year - 2006
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200622219
Subject(s) - grain boundary diffusion coefficient , grain boundary , diffusion , arrhenius equation , effective diffusion coefficient , analytical chemistry (journal) , thermal diffusivity , activation energy , chemistry , alloy , materials science , thermodynamics , crystallography , metallurgy , microstructure , physics , medicine , radiology , chromatography , magnetic resonance imaging
Heterodiffusion of 65 Zn 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 (0.1 c Al – 9.16) exp (–125.8 kJ mol –1 / RT ) m 2 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 ) m 3 s –1 . (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)