Grain Boundary Diffusion of Fe in High-Purity Copper

Jens Ribbe; Guido Schmitz; Sergiy V. Divinski

doi:10.4028/www.scientific.net/DDF.289-292.211

Paper Titles

Microstructure of the Passive Layer Formed on Different Austenitic Stainless Steels Implanted with Molybdenum
p.175

Synthesis and Characterization of a Porous Silicon Filter with Si₃N₄ Whiskers
p.185

Effect of the Si Additions on the Mechanical Behaviour and High-Temperature Performance of Hydrogen Sintered 434L Stainless Steels
p.195

Hydrogen Embrittlement of High Strength Steels
p.203

Grain Boundary Diffusion of Fe in High-Purity Copper
p.211

Investigation of Phase Transformation of Forged Steel Cold Rolls due to Heat Affecting and Prevent its Failure
p.219

Diffusion Enhanced Rumpling Associated with Martensitic Transformation upon Cycling of Aluminide Bond-Coats
p.227

Diffusion of a Corroding Electrolyte through Defective Electroplated Ceria Based Coatings
p.235

Long Term Diffusion Studies in Fe Aluminide Coatings Deposited by Slurry Application on Ferritic Steel
p.243

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Grain Boundary Diffusion of Fe in High-Purity Copper

Abstract:

Grain boundary (GB) diffusion of 59Fe in high purity polycrystalline copper was measured using the radiotracer technique and precision parallel sectioning in an extended temperature interval. The results of diffusion measurements below 900 K are consistent with Harrison's C kinetics and yield the GB diffusion coefficient of Fe in Cu with the pre-exponential factor of 5.610-6 m2/s and the activation enthalpy of 121 kJ/mol. Unexpectedly strong GB segregation of Fe in Cu hindered reliable determination of the Fe diffusivity in the B kinetics. Additionally, unconventional penetration profiles were measured for GB diffusion of 59Fe in Cu at high temperatures. Molecular dynamics simulation with the literature Finnis-Sinclair type interatomic potentials was performed to shed light into the observed features. A strong effect of the Fe coverage on GB structure and kinetics in pure Cu is predicted at increased temperatures above 900 K.