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Grain boundary self-diffusion in polycrystalline nickel of different purity levels / Sergiy V. Divinski in Acta materialia, Vol. 58 N° 2 (Janvier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 386-395 Titre : Grain boundary self-diffusion in polycrystalline nickel of different purity levels Type de document : texte imprimé Auteurs : Sergiy V. Divinski, Auteur ; Gerrit Reglitz, Auteur ; Gerhard Wilde, Auteur Article en page(s) : pp. 386-395 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Nickel  Grain  boundary  diffusion  Grain  boundary  segregation  Grain  boundary  width Index. décimale : 669 Métallurgie Résumé : Grain boundary self-diffusion in Ni materials of two different purity levels (99.6 and 99.999 wt.%) was measured over wide temperature intervals using the radiotracer technique and applying the 63Ni radioisotope. The diffusion experiments were performed in both Harrison’s type B and type C kinetic regimes. The diffusional grain boundary width, δ, was found to be equal to 0.54 ± 0.1 nm, that is reasonably close to the accepted value of View the MathML source in face-centred cubic metals. The purer the material, the higher the grain boundary diffusivity and the lower the corresponding activation enthalpy of self-diffusion along general high-angle grain boundaries. Using the semi-empirical approach of Borisov et al., the average energy of high-angle grain boundaries was estimated to be about 0.79 and 0.98 J m−2 in the low- and high-purity Ni materials at room temperature, respectively. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Grain boundary self-diffusion in polycrystalline nickel of different purity levels [texte imprimé] / Sergiy V. Divinski, Auteur ; Gerrit Reglitz, Auteur ; Gerhard Wilde, Auteur . - pp. 386-395. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 386-395 Mots-clés : Nickel  Grain  boundary  diffusion  Grain  boundary  segregation  Grain  boundary  width Index. décimale : 669 Métallurgie Résumé : Grain boundary self-diffusion in Ni materials of two different purity levels (99.6 and 99.999 wt.%) was measured over wide temperature intervals using the radiotracer technique and applying the 63Ni radioisotope. The diffusion experiments were performed in both Harrison’s type B and type C kinetic regimes. The diffusional grain boundary width, δ, was found to be equal to 0.54 ± 0.1 nm, that is reasonably close to the accepted value of View the MathML source in face-centred cubic metals. The purer the material, the higher the grain boundary diffusivity and the lower the corresponding activation enthalpy of self-diffusion along general high-angle grain boundaries. Using the semi-empirical approach of Borisov et al., the average energy of high-angle grain boundaries was estimated to be about 0.79 and 0.98 J m−2 in the low- and high-purity Ni materials at room temperature, respectively. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]