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Damage evolution and domain-level anisotropy in metal/ceramic composites exhibiting lamellar microstructures / Siddhartha Roy in Acta materialia, Vol. 58 N° 7 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2300–2312 Titre : Damage evolution and domain-level anisotropy in metal/ceramic composites exhibiting lamellar microstructures Type de document : texte imprimé Auteurs : Siddhartha Roy, Auteur ; Benjamin Butz, Auteur ; Alexander Wanner, Auteur Année de publication : 2011 Article en page(s) : pp. 2300–2312 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Metal  matrix  composites  (MMC)  Compression  test  Scanning  electron  microscopy  Analytical  electron  microscopy Résumé : Aluminium/alumina composites based on ceramic preforms prepared via freeze-casting are examined. Domains composed of alternating but also interpenetrating ceramic and metallic lamellae are observed. Single-domain samples were extracted from composites processed under different conditions. In situ scanning electron microscopy analyses were carried out to investigate the damage evolution under compressive load. The composite is strong and brittle when loaded along directions parallel to the freezing direction. When compressed in other directions, the behavior is controlled by the soft metal. The plastic anisotropy is less pronounced than theoretical predictions for laminates, which is explained by the presence of bridges between the ceramic lamellae. Coating the preform with Cu or Cu2O prior to melt infiltration reduces the compressive strengths of the composites. Transmission electron microscopy analysis shows that even in the case of a Cu coating a Cu2O layer is formed during processing, weakening the interface and preventing the dissolution of Cu in the aluminium alloy. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964540900857X [article] Damage evolution and domain-level anisotropy in metal/ceramic composites exhibiting lamellar microstructures [texte imprimé] / Siddhartha Roy, Auteur ; Benjamin Butz, Auteur ; Alexander Wanner, Auteur . - 2011 . - pp. 2300–2312. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 7 (Avril 2010) . - pp. 2300–2312 Mots-clés : Metal  matrix  composites  (MMC)  Compression  test  Scanning  electron  microscopy  Analytical  electron  microscopy Résumé : Aluminium/alumina composites based on ceramic preforms prepared via freeze-casting are examined. Domains composed of alternating but also interpenetrating ceramic and metallic lamellae are observed. Single-domain samples were extracted from composites processed under different conditions. In situ scanning electron microscopy analyses were carried out to investigate the damage evolution under compressive load. The composite is strong and brittle when loaded along directions parallel to the freezing direction. When compressed in other directions, the behavior is controlled by the soft metal. The plastic anisotropy is less pronounced than theoretical predictions for laminates, which is explained by the presence of bridges between the ceramic lamellae. Coating the preform with Cu or Cu2O prior to melt infiltration reduces the compressive strengths of the composites. Transmission electron microscopy analysis shows that even in the case of a Cu coating a Cu2O layer is formed during processing, weakening the interface and preventing the dissolution of Cu in the aluminium alloy. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964540900857X