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Influence of high-temperature solution treatments on mechanical properties of an Al–Si–Cu aluminum alloy / Hiroyuki Toda in Acta materialia, Vol. 58 N° 6 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 2014–2025 Titre : Influence of high-temperature solution treatments on mechanical properties of an Al–Si–Cu aluminum alloy Type de document : texte imprimé Auteurs : Hiroyuki Toda, Auteur ; Takanori Nishimura, Auteur ; Kentaro Uesugi, Auteur Année de publication : 2011 Article en page(s) : pp. 2014–2025 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Cast  aluminum  alloys  High-temperature  solution  heat  treatment  X-ray  tomography  K-edge  subtraction  imaging  Chemical  concentration  mapping Résumé : It has been demonstrated that the strength of an Al–Si–Cu alloy is maximized by high-temperature solution treatment at 807 K, which is approximately 16 K higher than the ternary eutectic temperature. The dual-energy K-edge subtraction imaging technique has been employed to obtain the spatial distribution of copper and its change during its solution treatment in three dimensions quantitatively, providing interpretations of the improved mechanical properties in terms of age-hardenability and its spatial variation. It has been also confirmed that the occurrence of incipient local melting and the accompanying growth of micro pores adjacent to the melt regions lead to fractures caused by these defects. However, it can be inferred that the positive effects can outweigh the negative effects even above the eutectic temperature, thereby realizing the maximum strength at such relative high temperature levels. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008234 [article] Influence of high-temperature solution treatments on mechanical properties of an Al–Si–Cu aluminum alloy [texte imprimé] / Hiroyuki Toda, Auteur ; Takanori Nishimura, Auteur ; Kentaro Uesugi, Auteur . - 2011 . - pp. 2014–2025. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 2014–2025 Mots-clés : Cast  aluminum  alloys  High-temperature  solution  heat  treatment  X-ray  tomography  K-edge  subtraction  imaging  Chemical  concentration  mapping Résumé : It has been demonstrated that the strength of an Al–Si–Cu alloy is maximized by high-temperature solution treatment at 807 K, which is approximately 16 K higher than the ternary eutectic temperature. The dual-energy K-edge subtraction imaging technique has been employed to obtain the spatial distribution of copper and its change during its solution treatment in three dimensions quantitatively, providing interpretations of the improved mechanical properties in terms of age-hardenability and its spatial variation. It has been also confirmed that the occurrence of incipient local melting and the accompanying growth of micro pores adjacent to the melt regions lead to fractures caused by these defects. However, it can be inferred that the positive effects can outweigh the negative effects even above the eutectic temperature, thereby realizing the maximum strength at such relative high temperature levels. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008234