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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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Maier-Kiener, Verena
Montanuniversität Leoben
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2024Advanced Nanoindentation Testing for Studying Strain-Rate Sensitivity and Activation Volume
- 2024Advancements in metal additive manufacturingcitations
- 2024Investigation of Phase Transformations and Ordering Mechanisms in a Pd–Cu–Ag–Ru Alloycitations
- 2023Nanoindentation creep of supercrystalline nanocompositescitations
- 2022Nanoindentation creep of supercrystalline nanocomposites
- 202230 Years of Oliver–Pharr: Then, Now and the Future of Nanoindentationcitations
- 2022Tuning mechanical properties of ultrafine-grained tungsten by manipulating grain boundary chemistrycitations
- 2021Extracting information from noisy data: strain mapping during dynamic in situ SEM experimentscitations
- 2021Grain boundary segregation in Ni-base alloys: A combined atom probe tomography and first principles studycitations
- 2021Bending behavior of zinc-coated hot stamping steelscitations
- 2021Copper and its effects on microstructure and correlated tensile properties of super duplex stainless steelscitations
- 2021Controlling the high temperature deformation behavior and thermal stability of ultra-fine-grained W by re alloyingcitations
- 2021How grain boundary characteristics influence plasticity close to and above the critical temperature of ultra-fine grained bcc Ta2.5Wcitations
- 2021Geometrical model for calculating the effect of surface morphology on total x-ray output of medical x-ray tubescitations
- 2021Rate-depending plastic deformation behaviour in a nickel-base alloy under hydrogen influencecitations
- 2021Assessment of grain boundary cohesion of technically pure and boron micro-doped molybdenum via meso-scale three-point-bending experimentscitations
- 2020Thermally activated deformation mechanisms and solid solution softening in W-Re alloys investigated via high temperature nanoindentationcitations
- 2020Microstructural evolution of W-10Re alloys due to thermal cycling at high temperatures and its impact on surface degradationcitations
- 2019Deformation-induced phase transformation in a Co-Cr-W-Mo alloy studied by high-energy X-ray diffraction during in-situ compression testscitations
- 2019Rate limiting deformation mechanisms of bcc metals in confined volumescitations
- 2019Beryllium – A challenge for preparation and mechanical characterization
- 2018Activation volume and energy of bulk metallic glasses determined by nanoindentationcitations
- 2018Bulk metallic dual phase glasses by severe plastic deformationcitations
- 2017Phase Decomposition of a Single-Phase AlTiVNb High-Entropy Alloy after Severe Plastic Deformation and Annealingcitations
Places of action
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article
Rate limiting deformation mechanisms of bcc metals in confined volumes
Abstract
<p>The influence of microstructure on the strength scaling behaviour of ultrafine-grained bcc metals is investigated by scale-bridging experiments spanning four orders of length on tungsten and chromium. By performing macroscopic compression experiments, nanoindentation and in-situ micro-compression tests in a scanning electron microscope, the plastically deformed volume was thoroughly reduced until a transition from bulk behaviour to single crystalline deformation characteristics was achieved. The stress-strain behaviour and local sample deformation characteristics were related to apparent deformation mechanisms established for polycrystalline bcc metals. The influence of small dimensions, interfaces and free surfaces on the deformation behaviour is considered with respect to the single crystal situation. The increasing fraction of free surfaces in small volumes explicitly alters the strength scaling behaviour in dependence of the intergranular dislocation accumulation processes. Furthermore, thermally activated deformation was analysed based on rate- and temperature-dependent properties, such as strain-rate sensitivity and activation volume. To mechanistically interpret this data, a dislocation based model predicting the temperature dependent activation volume was developed. We find that thermally activated kinks control the rate dependent properties below the critical temperature for all length scales and microstructure states.</p>