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On the infiltration mode during fabrication of aluminium composite / Peng Yu in Acta materialia, Vol. 58 N° 10 (Juin 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3790–3797 Titre : On the infiltration mode during fabrication of aluminium composite Type de document : texte imprimé Auteurs : Peng Yu, Auteur ; Ma Qian, Auteur ; Ling Li, Auteur Année de publication : 2011 Article en page(s) : pp. 3790–3797 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Infiltration  Al  alloy  Slug  flow  Eutectic Résumé : Porous Al 6061–2Mg–1Sn–3nylon preforms were nitrided and subsequently infiltrated with Al–Si and Al–Si–Mg alloys at different temperatures. Different infiltration modes were identified and confirmed by numerical simulation. When infiltration happens under conditions close to the eutectic points, it proceeds in the conventional slug flow mode with a well-defined infiltration front. However, as the infiltration conditions depart from the eutectic points, the infiltration mode changes gradually to extreme non-slug flow, where the infiltrant preferentially fills small pores irrespective of their distance from the infiltrant entrance, leading to homogeneous infiltrated structures without any infiltration front. The occurrence of different infiltration modes can be attributed to the competition between thermodynamic and kinetic factors. Extreme non-slug flow occurs under thermodynamically favourable conditions where the preform is well wetted by an infiltrant with sufficient fluidity. In contrast, slug flow occurs under kinetically favourable conditions when the low infiltration temperature at the eutectic points makes mass transport difficult. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001679 [article] On the infiltration mode during fabrication of aluminium composite [texte imprimé] / Peng Yu, Auteur ; Ma Qian, Auteur ; Ling Li, Auteur . - 2011 . - pp. 3790–3797. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 10 (Juin 2010) . - pp. 3790–3797 Mots-clés : Infiltration  Al  alloy  Slug  flow  Eutectic Résumé : Porous Al 6061–2Mg–1Sn–3nylon preforms were nitrided and subsequently infiltrated with Al–Si and Al–Si–Mg alloys at different temperatures. Different infiltration modes were identified and confirmed by numerical simulation. When infiltration happens under conditions close to the eutectic points, it proceeds in the conventional slug flow mode with a well-defined infiltration front. However, as the infiltration conditions depart from the eutectic points, the infiltration mode changes gradually to extreme non-slug flow, where the infiltrant preferentially fills small pores irrespective of their distance from the infiltrant entrance, leading to homogeneous infiltrated structures without any infiltration front. The occurrence of different infiltration modes can be attributed to the competition between thermodynamic and kinetic factors. Extreme non-slug flow occurs under thermodynamically favourable conditions where the preform is well wetted by an infiltrant with sufficient fluidity. In contrast, slug flow occurs under kinetically favourable conditions when the low infiltration temperature at the eutectic points makes mass transport difficult. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410001679