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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Delannay, Laurent
in Cooperation with on an Cooperation-Score of 37%
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Publications (39/39 displayed)
- 2024Combining nano-DIC and ACOM TEM to study the ductility enhancement of aluminium films by grain boundary sliding
- 2019Modelling creep induced by internal stresses in freestanding submicron Cu film
- 2019Influence of M23C6 dissolution on the kinetics of ferrite to austenite transformation in Fe-11Cr-0.06C stainless steelcitations
- 2018Modeling of microscopic strain heterogeneity during wire drawing of pearlitecitations
- 2018Residual ferrite in martensitic stainless steels: the effect of mechanical strength contrast on ductilitycitations
- 2017Constitutive law for thermally-activated plasticity of recrystallized tungstencitations
- 2016Dislocation and back stress dominated viscoplasticity in freestanding sub-micron Pd filmscitations
- 2016Atomistically-informed crystal plasticity in MgO polycrystals under pressure
- 2013Crystal plasticity modeling of through-thickness texture heterogeneity in heavily rolled aluminumcitations
- 2013Ductile fracture initiated by interface nucleation in two-phase elastoplastic systemscitations
- 2012Modelling the combined effect of grain size and grain shape on plastic anisotropy of metalscitations
- 2012A Macro- and micromechanics investigation of hot cracking in duplex steelscitations
- 2012Crystal plasticity modeling of texture development and hardening in TWIP steelscitations
- 2011Duplex Stainless Steel Microstructural Developments as Model Microstructures for Hot Ductility Investigationscitations
- 2011A variational formulation for the incremental homogenization of elasto-plastic compositescitations
- 2011First pseudo-grain failure model for inelastic composites with misaligned short fiberscitations
- 20103D modelling of deformation and recrystallization in polycrystals, combining a level set framework with adaptive meshing techniques
- 2010Assessment of plastic heterogeneity in grain interaction models using crystal plasticity finite element methodcitations
- 2010Void growth and coalescence in single crystalscitations
- 2010Influence of grain shape on the planar anisotropy of rolled steel sheets - evaluation of three modelscitations
- 2009Linking plastic deformation to recrystallization in metals, using digital microstructurescitations
- 2009Adaptive mesh refinement and automatic remeshing in crystal plasticity finite element simulationscitations
- 2009Crystal plasticity prediction of Lankford coefficient using the MULTISITE model: influence of the critical resolved shear stressescitations
- 2008Adaptive mesh refinement in crystal plasticity finite element simulations of large deformations in polycrystalline aggregates
- 2008Modelling of the plastic flow of trip-aided multiphase steel based on an incremental mean-field approachcitations
- 2007Reducing Computational Cost and Allowing Automatic Remeshing in FEM Models of Metal Forming Coupled With Polycrystal Plasticitycitations
- 2007Crystal-plasticity-based FE modelling of a dual-phase microstructure in which grains have non-uniform shape and sizecitations
- 2007Using Lagrangian particles to efficiently describe microstructure evolution in metal forming - Application to texture-induced mechanical anisotropycitations
- 2006Multiscale modelling of the plastic anisotropy and deformation texture of polycrystalline materials
- 2006A texture discretization technique adapted to polycrystalline aggregates with non-uniform grain sizecitations
- 2006Strategies of transport of microstructural variables for remeshing - application to texture induced mechanical anisotropy in metals
- 2005The application of multiscale modelling for the prediction of plastic anisotropy and deformation textures
- 2005Deformation texture prediction: from the Taylor model to the advanced Lamel model
- 2005Simulation of cup-drawing based on crystal plasticity applied to reduced grain samplingscitations
- 2004Decreasing computation time in finite element simulations coupled with polycrystalline plasticitycitations
- 2003Prediction of residual stresses and springback after bending of a textured aluminium plate
- 2002Comparison of two grain interaction models for polycrystal plasticity and deformation texture prediction
- 2001A disclination-based model for grain subdivisioncitations
- 2001Modelling the initial stage of grain subdivision with the help of a coupled substructure and texture evolution algorithmcitations
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document
Combining nano-DIC and ACOM TEM to study the ductility enhancement of aluminium films by grain boundary sliding
Abstract
The viscoplastic response of metallic nano-crystalline films has been widely studied in the literature by means of nanomechanical testing, such as with in situ TEM experiments [1], [2] or dedicated on chip test methods [3]. The enhancement of ductility (as compared to large grain samples) has been attributed to different mechanisms, including grain boundary sliding, grain growth or kinematic hardening due to dislocation pile up [2], [4]. However, observations of the polycrystal deformation are challenging due to highly refined grain sizes. The correlative methodology developed in this work allows probing the relationships between the microstructural changes and the total strain field, at a scale never resolved before – i.e. sample size of 2.5 x 25 µm and strain field resolution of 50 nm. The aluminium films deposited by sputtering (210 nm thickness) are mechanically loaded with an on chip method [3] and then observed after deformation in the transmission electron microscope (TEM). Nanoscale digital image correlation (nano-DIC) reveals multiple necking regions appearing at low plastic strains and further spreading along the sample gauge without leading to critical failure. Automated crystal orientation mapping (ACOM TEM) indicates that strain localization bands correspond to grain boundaries (GB) and that the global texture remains unchanged. The local shear amplitude achieved by such GB sliding correlates, to some extent, with the GB character. The complementary results obtained by both techniques shed some new light on the link between GB mediated plasticity and enhanced macroscopic ductility. REFERENCES [1] H. Idrissi et al., Applied Physics Letters, vol. 104, no. 10, p. 101903, 2014. [2] J. P. Liebig et al., Acta Materialia, vol. 215, p. 117079, 2021. [3] S. Gravier et al., J. Microelectromech. Syst., vol. 18, no. 3, pp. 555–569, 2009. [4] F. Mompiou et al., Acta Materialia, vol. 61, no. 1, pp. 205–216, 2013.