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Selective dissolution of nanolamellar Ti–41 at.% Al alloy single crystals / Yuichiro Koizumi in Acta materialia, Vol. 58 N° 8 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2876–2886 Titre : Selective dissolution of nanolamellar Ti–41 at.% Al alloy single crystals Type de document : texte imprimé Auteurs : Yuichiro Koizumi, Auteur ; Atsushi Sugihara, Auteur ; Hiroaki Tsuchiya, Auteur Année de publication : 2011 Article en page(s) : pp. 2876–2886 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Titanium  aluminides  Multilayers  Nanostructure  Corrosion  Electrochemistry Résumé : The selective dissolution behavior of Ti–41 at.% Al single crystals having a α2/γ-lamellar structure with a lamellar thickness in the range 20 nm to 1 μm have been investigated in 0.5 M NaCl aqueous solution focusing on the effect of lamellar thickness on the dissolution of γ-lamellae. In the case where γ-lamellae were thicker than ∼100 nm on average, γ-lamellae were selectively dissolved and, as a result, crevasses whose widths were close to the γ-lamellae thicknesses were formed. However, not all γ-lamellae were dissolved and the distribution of crevasses was much less uniform compared with that of the γ-lamellae. On the other hand, when the average γ-lamellae thickness was <100 nm relatively thick γ-lamellae were preferentially dissolved, but the distribution of the crevasses was relatively uniform compared with that obtained from the coarse lamellar structure. The reasons for this difference are discussed from the viewpoint of the absence of misfit dislocations in nanoscaled lamellae and the difference in ion transport through crevasses of different width formed by dissolution of γ-lamellae. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000303 [article] Selective dissolution of nanolamellar Ti–41 at.% Al alloy single crystals [texte imprimé] / Yuichiro Koizumi, Auteur ; Atsushi Sugihara, Auteur ; Hiroaki Tsuchiya, Auteur . - 2011 . - pp. 2876–2886. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2876–2886 Mots-clés : Titanium  aluminides  Multilayers  Nanostructure  Corrosion  Electrochemistry Résumé : The selective dissolution behavior of Ti–41 at.% Al single crystals having a α2/γ-lamellar structure with a lamellar thickness in the range 20 nm to 1 μm have been investigated in 0.5 M NaCl aqueous solution focusing on the effect of lamellar thickness on the dissolution of γ-lamellae. In the case where γ-lamellae were thicker than ∼100 nm on average, γ-lamellae were selectively dissolved and, as a result, crevasses whose widths were close to the γ-lamellae thicknesses were formed. However, not all γ-lamellae were dissolved and the distribution of crevasses was much less uniform compared with that of the γ-lamellae. On the other hand, when the average γ-lamellae thickness was <100 nm relatively thick γ-lamellae were preferentially dissolved, but the distribution of the crevasses was relatively uniform compared with that obtained from the coarse lamellar structure. The reasons for this difference are discussed from the viewpoint of the absence of misfit dislocations in nanoscaled lamellae and the difference in ion transport through crevasses of different width formed by dissolution of γ-lamellae. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000303