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Gyongyosi S.,MTA ME Materials Science Research Group | Barkoczy P.,University of Miskolc
Materials Science Forum | Year: 2013

Numerous simulation methods were developed to simulate the grain growth process in metals and alloys. The basis of these methods is the modeling of the properties and the movement of grain boundaries. From this size level in all solution could be get the microscopic nature of grain growth. One of the simulation methods is the cellular automaton. The simplest cellular automata are the one-dimensional cellular automata. In one-dimension all the properties of the grain boundaries cannot be taken into consideration. This article shows the scale and a method which makes the onedimensional cellular automaton suitable to simulate the grain coarsening process. The average grain size of a Cu18Ni20Zn alloy was measured during an isothermal heat treatment as a function of time and temperature. The results of the simulation are scaled to the measured values, and fit one to another. © (2013) Trans Tech Publications, Switzerland. Source


Benke M.,MTA ME Materials Science Research Group | Mertinger V.,University of Miskolc
Journal of Materials Engineering and Performance | Year: 2014

In situ optical microscope examinations were carried out on the thermally induced thermoelastic martensitic transformation in an untrained CuAlNi alloy and on the bainitic reaction in a CuAlNiMnFe alloy. It was found that a different martensite variant structure formed after every thermal cycle and the transformation was not accompanied with observable plastic deformation in the CuAlNi alloy. Elastic deformations were observed as the martensite plates reached grain boundaries. The growth of new martensite plates was initiated at these locations. The result are discussed and compared to results of other alloys found in the literature. The bainitic reaction was found to occur under isothermal conditions in the CuAlNiMnFe alloys. The reaction was accompanied with a relief formation much finer than that of the thermoelastic martensitic transformation. © 2014 ASM International. Source


Ronto V.,MTA ME Materials Science Research Group | Sycheva A.,MTA ME Materials Science Research Group | Solyom J.,MTA ME Materials Science Research Group | Pekker P.,MTA ME Materials Science Research Group | And 2 more authors.
Materials Science Forum | Year: 2014

Ti60(NixCu40-x)40 x = 5 - 40 at% ternary alloys were prepared by arc-melting followed by a centrifugal casting into a wedge-shaped copper mould in order to examine glass forming of these compositions. Microstructure of the master alloys and wedge-shaped samples were studied. Among the master alloys, which solidified under non-equilibrium conditions, the sample with 15 at% Ni content displayed clear eutectic structure and its wedge-shaped sample had the finest structure but still crystalline. Microstructure of the other compositions was far from amorphous state. © (2014) Trans Tech Publications, Switzerland. Source


Nagy C.,MTA ME Materials Science Research Group | Ronafoldi A.,MTA ME Materials Science Research Group | Roosz A.,MTA ME Materials Science Research Group
Materials Science Forum | Year: 2013

A measurement of the angular velocity/revolution number of magnetically stirred liquid gallium-indium alloy was realized with newly developed angular velocity measuring equipment. To get additional information about the flow of the melt, a numerical simulation model was performed with ANSYS FLUENT 13.0 with a single phase 2D k-ε turbulence solver. The aim was to reproduce the flow as accurate as possible, so the measured and computed angular velocity data was compared, to see if the system can be modeled fairly well. © (2013) Trans Tech Publications, Switzerland. Source


Nagy C.,MTA ME Materials Science Research Group | Fautrelle Y.,SIMAP EPM Laboratory | Budenkova O.,SIMAP EPM Laboratory | Ronafoldi A.,MTA ME Materials Science Research Group | Roosz A.,MTA ME Materials Science Research Group
Materials Science Forum | Year: 2014

A comparison of the results of RANS k-ε and LES turbulence models was done via the simulation of the electromagnetic stirring of liquid 75,5%Ga-24,5%In alloy (in a 10 mm diameter & 30 mm high crucible) using Ansys Fluent. Each velocity component, the distribution of eddies inside the melt and other flow parameters were compared respectively. The accuracy was checked with measured angular velocity data of A. Rónaföldi. The turbulent energy spectra were also produced to see the validity of the LES models. © (2014) Trans Tech Publications, Switzerland. Source

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