Papers by Keyword: Eutectic

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Authors: Doru Michael Ştefănescu
Abstract: This paper is a review of the marvelous development of mathematical and computer models that describe the fundamentals of microstructure evolution during the solidification of cast alloys, from the 1966 seminal paper by Oldfield, the first to attempt computational modeling of microstructure evolution during solidification, to the current prediction of mechanical properties. The latest analytical models for irregular eutectics such as cast iron, as well as numerical models with microstructure output, to include cellular automaton, will be discussed. Phase field models will not be discussed because of their inapplicability to casting solidification at the present time.
Authors: Wilfried Kurz
Abstract: The evolution of our understanding of dendritic and eutectic growth is presented. The control of both phenomena is essential in solidification processing. In this article, the development of the most important concepts which evolved over essentially one century will be described. Some of the original contributions which came from solid state transformation theory will also be included. This paper traces the history of the experimental and theoretical (analytical) work but leaves the numerical approach of the last 25 years for future papers.
Authors: Satya Prema, G.Y. Shreeshail, T.M. Chandrashekharaiah
Abstract: The Al-Si alloy is a structural material which generally consists of two or more particulates. However, Al-Si alloys are the most common alloys and commercially available ones due to their economical production. The utilization of Al-Si alloys has given the scope of study to improve in its properties using some grain refiner like Al-5Ti-1B, Al-3B and modifiers like Al-10Sr. The Al alloys were selected based on the economical uses and also, on the basis such that hypoeutectic (i.e., LM-25), eutectic (i.e., LM-6) and hypereutectic (i.e., LM-30). This project aimed to synthesize Al alloys (LM-6, LM-25 and LM-30) by melt stirring method with varying amount of grain refiners and / or modifier. The Prepared composites were characterized for machining properties. Alloys were evaluated for their machining properties which include surface roughness, lathe and drill tool dynamometer and comparing the machining properties with the minor addition of grain refienrs and/or modifier. The study concluded that, the addition of Al-3B to eutectic (i.e., LM-6) alloys has better surface finish.
Authors: Sarun Tuntarawongsa, Thawatchai Phaechamud
Abstract: Menthol was used as sublimate eutectic compound to prepare the volatile eutectic solvent by mixing with camphor, borneol or N-Ethyl-5-methyl-2-(1-methylethyl) cyclohexanecarboxamide (WS-3). The system of menthol:camphor, menthol:borneol and menthol:WS-3 in various ratio (1:9 to 9:1) was characterized. The 5:5 menthol:camphor system showed the highest evaporation rate. Ibuprofen dissolved in eutectic solvent was used as internal phase of emulsion whereas tween80 was used as emulsifier. Eutectic solvent was evaporated to induce the transformation of emulsion droplet to small particle. Eutectic could be used as solvent for preparing small size suspension (14.81±0.44 µm) without organic solvent used.
Authors: Serguei P. Murzin, Alexander A. Igolkin, Luiza F. Musaakhunova
Abstract: The possibilities of forming submicroporous and nanoporous structures in metallic materials by laser thermocycling as eutecticis reached were determined. With the implementation of the selected modes of laser treatment on L62 brass samples with a thickness of 50 µm leads to the formation of wrinkled relief, which indicates an increment of alloy volume in this area, that is, a porosity increment in the metallic material. Submicroporous and nanoporous structures are formed in the copper-zinc L62 alloy sample, which appear on the surface of the sample. Nanopores have a shape similar to equiaxial. Submicropores are formed as a result of nanopores merger. A relief is formed on the surface consisting of depressions having a shape similar to that of a hemisphere and a linear structure, oriented along the direction of rolling process.
Authors: O.M. Barabash, Yu.V. Milman, N.P. Korzhova, T.N. Legkaya, Yu.N. Podrezov
Authors: Shunkichi Ueno, Daniel Doni Jayaseelan, Naoki Kondo, Tatsuki Ohji, Shuzo Kanzaki, Hua Tay Lin
Abstract: Various coating methods of EBC layer for silicon nitride were discussed. High density EBC layer was successfully coated by different techniques such as sputtering, sol-gel and reaction sintering methods. Water vapor corrosion and recession mechanisms of Lu2Si2O7 which is a potential material for EBC were discussed. The problems in the development of EBC revealed by corrosion tests were summarized. The most important problem addressed here was the corrosion of silica at grain boundary. Due to corrosion of silica at the boundary, formation of porous surface is inevitable, then the silicon nitride substrate gets easily oxidized and/or corroded by water vapor. To resolve this issue, we propose a new EBC material without boundary silica and the corrosion mechanism of this improved EBC material is discussed.
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