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Silvere Akamatsu (CNRS - SU - INSP)19/06/2019, 10:30HighlightDirectionally solidified binary eutectics are of great practical interest as self-organized composite materials with tunable microstructural features. In a first approach, eutectic microstructures can be classified into rod-like and lamellar ones. Their formation dynamics, which results from a complex diffusion controlled dynamics of coupled-growth front patterns, has been extensively studied...Go to contribution page
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Amber Genau (University of Alabama at Birmingham)19/06/2019, 10:50Oral PresentationDuring the solidification of ternary eutectics, three solid phases form simultaneously from the melt. One system often employed to study this complex multi-phase solidification behavior is ternary eutectic $Al$-$Al_2Cu$-$Ag_2Al$. In this system the solubility of silver in the α-Al phase decreases by approximately 50% in a range of less than 20 K below the ternary eutectic temperature. This...Go to contribution page
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Isaac Chang (BCAST, Brunel University London)19/06/2019, 11:10Oral PresentationOur comprehensive understanding of binary eutectic solidification is largely due to years of extensive studies of many metallic and non-metallic systems. Recently, there has been increasing effort to understand ternary eutectic solidification due to the potential for refinement of microstructure resulting from increased number of co-existing crystalline phases during the solidification of...Go to contribution page
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Zsolt Veres (University of Miskolc)19/06/2019, 11:30Oral PresentationAl-Si alloys, which contains eutectic, are used in large quantities. Those are used not only like cast alloys but for base material of brazing technology as well. It is well known that too long Si lamellae can reduce the joining force of brazing, therefor it is necessary to produce finer eutectic structure. During manufacturing of brazing materials, the use of modifying agent (Na, Sr) is not...Go to contribution page
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Marco Seiz (Karlsruhe Institute of Technology)19/06/2019, 11:50Oral PresentationThe solidification of alloys shows a large variety of different microstructures depending on the material system and processing conditions. Since materials properties such as tensile strength are dependent on the microstructure, its prediction is a topic of high interest in order to produce materials with tailored properties. Whereas theory is capable of investigating simple geometries,...Go to contribution page
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Mathis Plapp (Laboratoire PMC - Ecole Polytechnique)19/06/2019, 13:30KeynoteLamellar eutectic two-phase growth is in principle well understood for alloys in which the solid-liquid and solid-solid interfaces are isotropic. However, there are numerous experimental observations that cannot be explained by theories and numerical models with isotropic interfaces. Examples are the occurrence of lamellar growth directions that markedly differ from the direction of the...Go to contribution page
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101. ANISOTROPY EFFECTS ON LAMELLAR-EUTECTIC SOLIDIFICATION MICROSTRUCTURES IN THIN Al-Al2Cu SAMPLESSabine Bottin-Rousseau (Sorbonne Université)19/06/2019, 14:00Oral PresentationWe present an in situ experimental study of crystallographic effects during lamellar- eutectic growth in thin Al-Al2Cu samples. The Al-Al2Cu alloy is known to form eutectic-grain dependent lamellar eutectic microstructures, and to present special, or heteroepitaxy orientation relationships (OR) between the eutectic crystals. The term crystallographic effects refers here to a marked dependence...Go to contribution page
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Johannes Hötzer (Herr)19/06/2019, 14:20Oral PresentationDirectional solidification is a favored process to manufacture homogeneous microstructures which lead to macroscopically unique properties for a material. The dependence of the spacing and type of the arising microstructure from the solidification velocity for constant velocities is extensively investigated. However the effect of changes in the solidification velocity on the resulting...Go to contribution page
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Kiran Aramanda Shanmukha (Indian Institute of Science)19/06/2019, 14:40Oral PresentationEutectic alloys are self-organising composite materials with a wide variety of microstructural features. Size, shape, distribution, and orientation of these features can be modified by process parameters (temperature gradient, velocity of interface) as well as material parameters (volume fractions, anisotropy of interfacial energies, diffusivities, impurity nature and its percentage etc.). The...Go to contribution page
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Prof. Melis Serefoglu (Koc University)19/06/2019, 15:00Oral PresentationWe present an experimental investigation on the effects of the interphase energy anisotropy on the formation of three-phase growth microstructures during directional solidification (DS) of the β(In)–In2Bi–γ(Sn) ternary-eutectic system. Standard DS and rotating directional solidification (RDS) experiments were performed using thin alloy samples with real-time observation. We identified two main...Go to contribution page
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Lina Jia (Beihang University)19/06/2019, 15:20Oral PresentationSpherical pre-alloyed Nb-20Si-24Ti-2Cr-2Al (at.%) powders were prepared by plasma rotating electrode processing (PREP). The diameters of the pre-alloyed powders ranged from 45 μm to 380 μm. The microstructure and surface oxides of Nb-Si based alloy powders were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectra (XPS) and Auger electron...Go to contribution page
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