Multiscale modeling of Equal Channel Angular Extruded aluminium with strain gradient crystal plasticity and phenomenological models

L. Duchêne, M.G.D. Geers, W.A.M. Brekelmans, E. Chen, B. Verlinden, A.M. Habraken

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

1 Citaat (Scopus)

Samenvatting

The Equal Channel Angular Extrusion process is used to modify the microstructure of an AA1050 aluminum alloy in order to produce an ultra fine grained material. Due to the severe plastic deformation undergone by the material during the ECAE process, the subsequent behavior of the material is non-conventional and difficult to model with classical constitutive laws (e.g. ECAE aluminum presents a large initial back-stress which must be adequately incorporated in the model). In this study, the evolution of the back-stress during the ECAE process is analyzed. Two different numerical models were investigated in this respect. The first one is a single crystal strain gradient plasticity model based on dislocation densities. The second model is the Teodosiu and Hu's hardening model, which is a microstructuraly based phenomenological model at the macroscale. The results provided by the two models are obviously distinct. Nevertheless, some common trends can be pointed out, among which the amplitude of the back-stress that is similar. In agreement with the cyclic deformation mode of the studied route C ECAE process, the evolution of the predicted back-stress is also cyclic in both models
Originele taal-2Engels
TitelMaterials Processing and Texture - 15th International Conference on Textures of Materials, ICOTOM 15
Plaats van productiePittsburgh, PA
Pagina's671-678
DOI's
StatusGepubliceerd - 2008

Publicatie series

NaamCeramic Transactions
Volume200
ISSN van geprinte versie1042-1122

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