| 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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Henein, Hani
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2023The most sustainable high entropy alloys for the future
- 2023Influence of Minor Additions of Be on the Eutectic Modification of an Al-33wt.%Cu Alloy Solidified under Transient Conditionscitations
- 2023Development and Application of a Thermal Microstructure Model of Laminar Cooling of an API X70 Microalloyed Steel
- 2017Solidification of Undercooled Melts of Al-Based Alloys on Earth and in Spacecitations
- 2016Quantification of Primary Dendritic and Secondary Eutectic Nucleation Undercoolings in Rapidly Solidified Hypo-Eutectic Al-Cu Dropletscitations
- 2015Characterization of dendrite morphologies in rapidly solidified Al–4.5wt.%Cu dropletscitations
- 2015Evolution of the dendritic morphology with the solidification velocity in rapidly solidified Al- 4.5wt.%Cu dropletscitations
- 2014Dendrite growth morphologies in rapidly solidified Al-4.5wt.%Cu dropletscitations
- 2013Quantification of primary dendritic and secondary eutectic undercoolings of rapidly solidified Al-Cu droplets
- 2013Quantification of primary dendritic and secondary eutectic undercoolings of rapidly solidified Al-Cu droplets
- 2012Quatification of primary phase undercooling of rapidly solidified droplets with 3D microtomographycitations
- 2012Quatification of primary phase undercooling of rapidly solidified droplets with 3D microtomographycitations
- 2012Neutron diffraction analysis and solidification modeling of Impulse-Atomized Al-36 wt%Nicitations
- 2011Containerless solidification and characterization of industrial alloys (NEQUISOL)citations
- 2011Non-equilibrium solidification, modelling for microstructure engineering of industrial alloys (NEQUISOL)
- 2010Droplet Solidification of Impulse Atomized Al-0.61Fe and Al-1.9Fe
- 2009A Solidification Model for Atomizationcitations
- 2008Non-equilibrium and near-equilibrium solidification of undercooled melts of Ni- and Al-based alloyscitations
- 2008The Effect of Eutectic Undercooling on Microsegregation of Rapidly Solidified Al-Cu Droplets
- 2006Atomized droplet solidification as an equiaxed growth modelcitations
- 2004X-ray tomography study of atomized al-cu droplets citations
- 2004Modeling of Heat and Solute Flows during Solidification of Droplets
Places of action
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conferencepaper
Non-equilibrium solidification, modelling for microstructure engineering of industrial alloys (NEQUISOL)
Abstract
Within NEQUISOL project, crystallisation kinetics and microstructure evolution in undercooled melts of Al-based alloys is investigated. Different techniques are applied for containerless processing of the different alloys. These allow for undercooling a liquid far below its equilibrium melting temperature. An undercooled melt is in a metastable state giving access of different solidification pathways the system can take. Solidification starts with nucleation and is completed by subsequent growth of crystals. The negative temperature gradient in front of the solid-liquid interface and the concentration gradient in alloys destabilize a planar interface leading to dendrite growth. Dendrite growth dynamics and microstructure evolution in undercooled melts is investigated on drops undercooled by Electro-Magnetic Levitation (EML). The speed of the propagating solidification front is monitored by means of a high-speed camera with a maximum frequency of 120 000 pictures per second. Under Earth conditions strong alternating electromagnetic fields are needed to compensate the gravitational force. This, in turn, causes forced convection due to the strong stirring effects. Therefore, equivalent experiments are conducted under microgravity conditions using the TEMPUS facility for electromagnetic levitation in reduced gravity during parabolic flights and during TEXUS sounding rocket missions. Experiments on four selected alloys, Al 40Ni 60, Al 70Ni 30, Al 65Ni 35 and Al 89Cu 11 are in preparation to be performed on board the ISS using the Electro-Magnetic Levitator currently under development by DLR/ESA. In addition atomization facilities are operated that combines containerless processing with large cooling rates and reduced gravity on Earth. Atomization is an industrial processing route to produce metastable materials in large amount. We present a comparison of first experiments conducted in reduced gravity (parabolic flight, TEXUS) and reference experiments on Earth of measurements of the growth velocity as a function of undercooling of the congruently melt-ing Al 50Ni 50 alloy and the Raney type alloy Al 68.5Ni 31.5. The latter one is of special interest for industry because of its extraordinary potency as a catalyst. The experiments clearly demonstrate how important convection is in heat and mass transport processes which control dendrite growth dynamics and, hence, microstructure evolution. A sharp interface theory is presented that takes into account heat and mass transport by forced convection. This mesoscopic model is able to predict the dendrite growth kinetics obtained both on Earth as well as in reduced gravity. In addition, mesoscopic modelling is combined with macroscopic modelling to describe the entire solidification process involving several recalescences and the non-equilibrium solidification of several solid microstructures.