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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
Geometrical model for calculating the effect of surface morphology on total x-ray output of medical x-ray tubes
Abstract
<p>Purpose: Correlation of characteristic surface appearance and surface roughness with measured air kerma (kinetic energy released in air) reduction of tungsten-rhenium (WRe) stationary anode surfaces. Methods: A stationary anode test system was developed and used to alter nine initially ground sample surfaces through thermal cycling at high temperatures. A geometrical model based on high resolution surface data was implemented to correlate the measured reduction of the air kerma rate with the changing surface appearance of the samples. In addition to the nine thermally cycled samples, three samples received synthetic surface structuring to prove the applicability of the model to nonconventional surface alterations. Representative surface data and surface roughness values were acquired by laser scanning confocal microscopy. Results: After thermal cycling in the stationary anode test system, the samples showed surface features comparable to rotating anodes after long-time operation. The established model enables the appearance of characteristic surface features like crack networks, pitting, and local melting to be linked to the local x-ray output at 100 kV tube voltage, 10° anode take off angle and 2 mm of added Al filtration. The results from the conducted air kerma measurements were compared to the predicted total x-ray output reduction from the geometrical model and show, on average, less than 10 % error within the 12 tested samples. In certain boundaries, the calculated surface roughness R<sub>a</sub> showed a linear correlation with the measured air kerma reduction when samples were having comparable damaging characteristics and similar operation parameters. The orientation of the surface features had a strong impact on the measured air kerma rate which was shown by testing synthetically structured surfaces. Conclusions: The geometrical model used herein considers and describes the effect of individual surface features on the x-ray output. In close boundaries arithmetic surface roughness R<sub>a</sub> was found to be a useful characteristic value on estimating the effect of surface damage on total x-ray output.</p>