Andreas Ludwig
University of Leoben
ConvectionComposite materialCastingChemistryMetallurgyMaterials scienceTurbulenceIngotContinuous castingAlloyPhase (matter)MechanicsNucleationFlow (psychology)Mechanical engineeringDendrite (crystal)Equiaxed crystalsCell biologyThermodynamics
Publications 393
#2Menghuai WuH-Index: 27
#3Peter SchumacherH-Index: 21
Last. Abdellah KharichaH-Index: 18
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#2Abdellah KharichaH-Index: 18
#3Menghuai WuH-Index: 27
In this study, a first attempt is made to bridge capillary-driven fragmentation and grain transport using a mixed columnar-equiaxed solidification model. Grain transport is an intrinsic feature of the employed solidification model which has been extensively investigated over the years. Regarding the capillary-driven fragmentation event, a new correlation between the number of fragments and interfacial area density of the columnar structure was recently established by Cool and Voorhees (2017) bas...
A comprehensive numerical model is proposed to study the influence of an axial magnetic field (AMF) on the solidification behavior of a Titanium-based (Ti–6Al–4V) vacuum arc remelting (VAR) ingot. Both static and time-varying AMF are examined. The proposed 2D axisymmetric swirl model includes calculating electromagnetic and thermal fields in the entire system composed of the electrode, vacuum plasma, ingot, and mold. A combination of vector potential formulation and induction equation is propose...
#2Abdellah KharichaH-Index: 18
Last. Sven Eckert (HZDR: Helmholtz-Zentrum Dresden-Rossendorf)H-Index: 32
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A numerical study is presented that deals with the flow in the mold of a continuous slab caster under the influence of a DC magnetic field (electromagnetic brakes (EMBrs)). The arrangement and geometry investigated here is based on a series of previous experimental studies carried out at the mini-LIMMCAST facility at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR). The magnetic field models a ruler-type EMBr and is installed in the region of the ports of the submerged entry nozzle (SEN). The cur...
2 CitationsSource
A forced flow was experimentally shown to influence the solidification microstructure of metal alloys by modifying the coarsening/ripening law. In some technical alloys (AlSi7Fe1), this flow effect can also be significantly suppressed due to the formation of intermetallic precipitates (β-Al5FeSi) that can block the flow in the mushy region. The forced flow was induced by a rotating magnetic field (RMF). Herein, a three-phase volume-average-based solidification model is introduced to reproduce th...
1 CitationsSource
#1Chen Zhou (RWTH Aachen University)H-Index: 2
#2Sebastian Bette (RWTH Aachen University)H-Index: 3
Last. Uwe Schnakenberg (RWTH Aachen University)H-Index: 33
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Abstract Stretchable microelectrodes paired with an ultra-elastic substrate can be used for electrical sensing of mechanically stretched cells and cell monolayers. Here, we present the development of a cell-stretching platform with thin-film interdigitated microelectrodes. Up to 35% cyclic stretch are feasible with a novel interlaced meander design connected to the microelectrodes and using Poly(dimethylsiloxane) (PDMS) with a Young’s modulus of 50 kPa as an ultra-elastic substrate. Reliable ele...
#1Puja Jain (Leibniz Association)H-Index: 2
#2Akihiro Nishiguchi (National Institute for Materials Science)H-Index: 14
Last. Smriti Singh (MPG: Max Planck Society)H-Index: 1
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Alveolar-capillary basement membrane (BM) is ultra-thin (<2 µm) extracellular matrix that maintains integral epithelial-endothelial cell layers. In vitro reconstructions of alveolar-capillary barrier supported on synthetic scaffolds closely resembling the fibrous and ultra-thin natural BM are essential in mimicking the lung pathophysiology. Although BM topology and dimensions are well known to significantly influence cellular behavior, conventionally used BM mimics fail to recreate this natural ...