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Microstructure-based multiscale modeling of elevated temperature deformation in aluminum alloys / Paul E. Krajewski in Acta materialia, Vol. 58 N° 3 (Fevrier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 1074-1086 Titre : Microstructure-based multiscale modeling of elevated temperature deformation in aluminum alloys Type de document : texte imprimé Auteurs : Paul E. Krajewski, Auteur ; Louis G. Hector, Auteur ; Ningning Du, Auteur Article en page(s) : pp. 1074-1086 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Aluminum  alloys  Creep  Superplasticity  Grain  boundaries  Micromechanical  modeling Index. décimale : 669 Métallurgie Résumé : A multiscale model for predicting elevated temperature deformation in Al–Mg alloys is presented. Constitutive models are generated from a theoretical methodology and used to investigate the effects of grain size on formability. Flow data are computed with a polycrystalline, microstructure-based model which accounts for grain boundary sliding, stress-induced diffusion, and dislocation creep. Favorable agreement is found between the computed flow data and elevated temperature tensile measurements. A creep constitutive model is then fit to the computed flow data and used in finite-element simulations of two simple gas pressure forming processes, where favorable results are observed. These results are fully consistent with gas pressure forming experiments, and suggest a greater role for constitutive models, derived largely from theoretical methodologies, in the design of Al alloys with enhanced elevated temperature formability. The methodology detailed herein provides a framework for incorporation of results from atomistic-scale models of dislocation creep and diffusion. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Microstructure-based multiscale modeling of elevated temperature deformation in aluminum alloys [texte imprimé] / Paul E. Krajewski, Auteur ; Louis G. Hector, Auteur ; Ningning Du, Auteur . - pp. 1074-1086. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 3 (Fevrier 2010) . - pp. 1074-1086 Mots-clés : Aluminum  alloys  Creep  Superplasticity  Grain  boundaries  Micromechanical  modeling Index. décimale : 669 Métallurgie Résumé : A multiscale model for predicting elevated temperature deformation in Al–Mg alloys is presented. Constitutive models are generated from a theoretical methodology and used to investigate the effects of grain size on formability. Flow data are computed with a polycrystalline, microstructure-based model which accounts for grain boundary sliding, stress-induced diffusion, and dislocation creep. Favorable agreement is found between the computed flow data and elevated temperature tensile measurements. A creep constitutive model is then fit to the computed flow data and used in finite-element simulations of two simple gas pressure forming processes, where favorable results are observed. These results are fully consistent with gas pressure forming experiments, and suggest a greater role for constitutive models, derived largely from theoretical methodologies, in the design of Al alloys with enhanced elevated temperature formability. The methodology detailed herein provides a framework for incorporation of results from atomistic-scale models of dislocation creep and diffusion. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]