This paper addresses the challenge of reconstructing randomly distributed second-phase particle-strengthened microstructure of AA7075-O aluminum sheet material for computational analysis.The particle characteristics in 3D space were obtained from focused ion beam and scanning electron mi-croscopy(FIB-SEM)and SEM-based Electron Backscatter Diffraction/Energy Dispersive X-ray Spectrom-etry(EBSD/EDS)techniques.A theoretical framework for analysis of elastic-plastic deformation of such 3D microstructures is developed.Slip-induced shear band formation,void initiation,growth and linkage at large plastic strains during uniaxial tensile loading were investigated based on reconstructed 3D rep-resentative volume element(RVE)models with real-distribution of particles and the results compared with experimental observations.In-situ SEM interrupted tension tests along transverse direction(TD)and rolling direction(RD),employing microscopic-digital image correlation(μ-DIC)technique,were carried out to investigate slip bands,micro-voids formation and obtain microstructural strain maps.The resulting local strain maps were analyzed in relation to the experimentally observed plastic flow localization,fail-ure modes and local stress maps from simulations of RVE models.The influences of particle size,shape,orientation,volume fraction as well as matrix-particle interface properties on local plastic deformation,global stress-strain/strain-hardening curves and interfacial failure mechanisms were studied based on 3D RVE models.When possible,the model results were compared with in-situ tensile test data.In general,good agreement was observed,indicating that the real 3D microstructure-based RVE models can accu-ratelv predict the plastic deformation and interfacial failure evolution in AA7075-O aluminum sheet.

College of Aerospace and Civil Engineering,Harbin Engineering University,Harbin 150001,China;Department of Mechanical Engineering,McMaster University,Hamilton,ON L8S4L7,Canada

[1]Qingping Sun;Shahryar Asqardoust;Abhishek Sarmah;Mukesh K.Jain-.Elastoplastic analysis of AA7075-O aluminum sheet by hybrid micro-scale representative volume element modeling with really-distributed particles and in-situ SEM experimental testing)[J].材料科学技术（英文版）,2022(28):201-221

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