Global ETD Search

31	Řízená krystalizace odlitků z hliníkových slitin ve skořepinových formách / Controled crystallisation of aluminium alloys castings poured in shell moulds Mašková, Lenka January 2010 (has links) The aim of this thesis is to verify a possibility of controlling the crystallisation of aluminium alloys poured in shell moulds in order to achieve directional solidification. For this purpose, new cooling plant has been designed and fabricated. Several sample castings were produced under different initial conditions. Based on the evaluation of measured temperatures, a numerical simulation of heat transfer was created using the ProCAST software. Finally, the sample castings were sectioned into specimens that were, subsequently, metallographically polished and the evaluation of their structure with respect to the amount and types of defects was performed.
32	Modeling of directional solidification of multicrystalline silicon in a traveling magnetic field Dadzis, Kaspars 30 November 2012 (has links) Melt flow plays an important role in directional solidification of multicrystalline silicon influencing the temperature field and the crystallization interface as well as the transport of impurities. This work investigates the potential of a traveling magnetic field (TMF) for an active control of the melt flow. A system of 3D numerical models was developed and adapted based on open-source software for calculations of Lorentz force, melt flow, and related phenomena. Isothermal and non-isothermal model experiments with a square GaInSn melt were used to validate the numerical models by direct velocity measurements. Several new 3D flow structures of turbulent TMF flows were observed for different melt heights. Further numerical parameter studies carried out for silicon melts showed that already a weak TMF-induced Lorentz force can stir impurities near to the complete mixing limit. Simultaneously, the deformed temperature field leads to an increase of the deflection of crystallization interface, which may exhibit a distinct asymmetry. The numerical results of this work were implemented in a research-scale silicon crystallization furnace. Scaling laws for various phenomena were derived allowing a limited transfer of the results to the industrial scale. info:eu-repo/classification/ddc/530 ddc:530
33	Effect of Step Change in Growth Speed During Directional Solidification on Array Morphology of Al-7 wt% Si Alloy Pakiru, Swapna January 2011 (has links) No description available. Chemical Engineering Materials Science Metallurgy Directional Solidification Step change Growth Speed Morphology Nearest Neighbor Spacing Trunk diameter Side branch length Side branch orientation Al- 7 wt% Si alloy thermal gradient step increase step decrease steady state transition.
34	Effect of Convection Associated with Cross-section Change during Directional Solidification of Binary Alloys on Dendritic Array Morphology and Macrosegregation Ghods, Masoud 17 July 2017 (has links) No description available. Aerospace Materials Automotive Materials Chemical Engineering Condensed Matter Physics Engineering Fluid Dynamics High Temperature Physics Materials Science Metallurgy Directional Solidification Natural Convection Fluid Flow Binary Alloys Macrosegregation Dendritic Array Dendrite Morphology Solutal Remelting Thermosolutal Convection Aluminum Alloy Cross section Change
35	Influence Of Cross-Section Change During Directional Solidification On Dendrite Morphology, Macrosegregation And Defect Formation In Pb-6 wt Sb Alloy Lacdao, Claudine 25 August 2017 (has links) No description available. Chemical Engineering Cross-Section Change Directional Solidification Dendrite Morphology Density Inversion Dendrite Trunk Diameter Nearest Neighbor Spacings Lead Antimony Alloy Binary Alloy

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