| People | Locations | Statistics |
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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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Karnthaler, Hans-Peter
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (21/21 displayed)
- 2012Synthesis and characterization of electrodeposited hierarchical nanodendritic NiCoFe alloy powderscitations
- 2011Growth of nanosized chemically ordered domains in intermetallic FeAl made nanocrystalline by severe plastic deformationcitations
- 2011Three-Dimensional Analysis by Electron Diffraction Methods of Nanocrystalline Materialscitations
- 2011Nanocrystalline Zr3Al made through amorphization by repeated cold rolling and followed by crystallizationcitations
- 2011Thermally induced transition from a ferromagnetic to a paramagnetic state in nanocrystalline FeAl processed by high-pressure torsioncitations
- 2011Preparation of CoNi high surface area porous foams by substrate controlled electrodepositioncitations
- 2010Electron microscopy of severely deformed L12 intermetallicscitations
- 2010Quantitative local profile analysis of nanomaterials by electron diffractioncitations
- 2010In situ TEM study of microplasticity and Bauschinger effect in nanocrystalline metalscitations
- 2010Structural modifications during heating of bulk nanocrystalline FeAl produced by high-pressure torsioncitations
- 2008The stability of screw dipoles in Ni3Al studied by TEMcitations
- 2008TEM study of local disordering: a structural phase change induced by high-pressure torsioncitations
- 2008Extensive disordering in long-range-ordered Cu3Au induced by severe plastic deformation studied by transmission electron microscopycitations
- 2008High pressure torsion of intermetallic Zr3Alcitations
- 2007Coherent x-ray diffraction imaging of grown-in antiphase boundaries in Fe65 Al35citations
- 2007Formation and structures of bulk nanocrystalline intermetallic alloys studied by transmission electron microscopycitations
- 2004Nanostructures in L12-ordered Cu3Au processed by torsion under high pressurecitations
- 2004HRTEM analysis of nanostructured alloys processed by severe plastic deformationcitations
- 2004TEM of nanostructured metals and alloyscitations
- 2003TEM investigation of the structure of deformation-induced antiphase boundary faults in Ni3Alcitations
- 2001On the origin of work softening of Ni3Al deformed along [001] above the peak temperaturecitations
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article
In situ TEM study of microplasticity and Bauschinger effect in nanocrystalline metals
Abstract
In situ transmission electron microscopy straining experiments with concurrent macroscopic stress–strain measurements were performed to study the effect of microstructural heterogeneity on the deformation behavior of nanocrystalline metal films. In microstructurally heterogeneous gold films (mean grain size dm = 70 nm) comprising randomly oriented grains, dislocation activity is confined to relatively larger grains, with smaller grains deforming elastically, even at applied strains approaching 1.2%. This extended microplasticity leads to build-up of internal stresses, inducing a large Bauschinger effect during unloading. Microstructurally heterogeneous aluminum films (dm = 140 nm) also show similar behavior. In contrast, microstructurally homogeneous aluminum films comprising mainly two grain families, both favorably oriented for dislocation glide, show limited microplastic deformation and minimal Bauschinger effect despite having a comparable mean grain size (dm = 120 nm). A simple model is proposed to describe these observations. Overall, our results emphasize the need to consider both microstructural size and heterogeneity in modeling the mechanical behavior of nanocrystalline metals.