| 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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Alfreider, Markus
Montanuniversität Leoben
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (21/21 displayed)
- 2024Stabilization of mechanical strength in a nanocrystalline CoCrNi concentrated alloy by nitrogen alloying
- 2024Micro-Mechanical Fracture Investigations on Grain Size Tailored Tungsten-Copper Nanocompositescitations
- 2024Automatic and time-resolved determination of fracture characteristics from in situ experimentscitations
- 2023Deformation and failure behavior of nanocrystalline WCucitations
- 2023Magnetic Properties of a High-Pressure Torsion Deformed Co-Zr Alloycitations
- 2023Revealing the nano-scale mechanisms of the limited non-basal plasticity in magnesium
- 2023Nanoscale printed tunable specimen geometry enables high-throughput miniaturized fracture testingcitations
- 2022In situ micromechanical analysis of a nano-crystalline W-Cu compositecitations
- 2022Interface mediated deformation and fracture of an elastic–plastic bimaterial system resolved by in situ transmission scanning electron microscopycitations
- 2022The influence of chemistry on the interface toughness in a WTi-Cu systemcitations
- 2021Prospects of Using Small Scale Testing to Examine Different Deformation Mechanisms in Nanoscale Single Crystals—A Case Study in Mgcitations
- 2021Extracting information from noisy data: strain mapping during dynamic in situ SEM experimentscitations
- 2020Correlation between fracture characteristics and valence electron concentration of sputtered Hf-C-N based thin filmscitations
- 2020In situ fracture observations of distinct interface types within a fully lamellar intermetallic TiAl alloycitations
- 2020Probing defect relaxation in ultra-fine grained Ta using micromechanical spectroscopycitations
- 2019Bioinspired nacre-like alumina with a bulk-metallic glass-forming alloy as a compliant phasecitations
- 2019Rate limiting deformation mechanisms of bcc metals in confined volumescitations
- 2018In-situ elastic-plastic fracture mechanics on the microscale by means of continuous dynamical testingcitations
- 2018In-situ TEM observation of {101¯2} twin-dominated deformation of Mg pillarscitations
- 2017The influence of deformation and proton-irradiation on the mechanical behaviour in nano-crystalline stainless steels
- 2016Synthesis and Mechanical Characterisation of an Ultra-Fine Grained Ti-Mg Compositecitations
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>