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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
Tuning mechanical properties of ultrafine-grained tungsten by manipulating grain boundary chemistry
Abstract
Tungsten is, due to a combination of high strength and good physical properties, frequently considered for high-performance applications in the harshest environments. Oftentimes its inherent brittleness and low ductility stand in the way of a successful deployment in these fields. Since tungsten has been proposed as divertor material for nuclear fusion reactors, an improvement of ductility and fracture toughness is essential. An obvious first step to increase these properties is to reduce the grain size to the ultrafine-grained regime. As this still leaves the material with a relatively low-energy intercrystalline fracture mode, this work takes a step further. With the help of doping elements, which are identified from ab-initio simulations, an attempt to increase grain boundary cohesion of ultra-fine grained tungsten to improve ductility is made. After fabrication of the doped samples from powders using severe plastic deformation, thorough microstructural investigations and extensive mechanical characterization, utilizing various small-scale testing techniques, are combined to assess the properties of the materials. We report that the addition of boron and hafnium can significantly increase the bending strength and bending ductility of ultra-fine grained tungsten. An additional heat treatment of the boron doped sample amplifies this effect even further, drastically increasing the strength and overall mechanical properties due to a combination of hardening-by-annealing and increased grain boundary segregation. Thus, an effective way to adaptively improve the mechanical properties of tungsten by manipulating grain boundary chemistry is reported, validating grain boundary segregation engineering as a powerful tool for enhancing damage tolerance in brittle materials.