Jožef Medved

University of Ljubljana

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Maja Vončina

University of Ljubljana

Primož Mrvar

University of Ljubljana

Tilen Balaško

University of Ljubljana

Jaka Burja

Institute of Metals and Technology

Aleš Nagode

University of Ljubljana

Mitja Petrič

University of Ljubljana

BŠ

Barbara Šetina Batič

Institute of Metals and Technology

Stanislav Kores

Talum (Slovenia)

Matjaž Godec

Institute of Metals and Technology

Barbara Simončić

University of Ljubljana

Cooperative Institutions

University of Ljubljana

Institute of Metals and Technology

National Institute of Chemistry

Impol (Slovenia)

University of Maribor

University of Zagreb

Jožef Stefan International Postgraduate School

Jožef Stefan Institute

Talum (Slovenia)

Štore Steel (Slovenia)

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Solidification and Microstructure Characteristics of the AlMg9 alloy

Zdenka Zovko Brodarac Primož Mrvar Faruk Unkić Jožef Medved

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Microstructure evolution during solution annealing of an Al–Zn–Mg–Cu alloy with La additions

Scientific Reports (2025)

Tilen Balaško Aleš Nagode Jiehua Li Jožef Medved

10.1038/s41598-025-88490-7

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Tehnologija toplega stiskanja jeklenih prahov in lastnosti sintranih jeklenih izdelkov

Materiali in tehnologije (2001)

Borivoj Šuštaršič M. Torkar B. Glogovac Anton Jaklič Matjaž Godec

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Transformation of the Metastable Al6Fe Intermetallic Phase during Homogenization of a Binary Al-Fe Alloy

Materials (2021)

Jože Arbeiter Maja Vončina Barbara Šetina Batič Jožef Medved

Within the scope of this research the transformation of the Al6Fe metastable phase was analyzed via Differential Scanning Calorimetry (DSC), optical and Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). A binary Al-Fe1.1 low-impurity alloy was produced with refined raw materials in a controlled environment. With a cooling rate of 35 K/s, solidification of the Al6Fe metastable phase was achieved. The samples were homogenized at 600 °C for 2-24 h. Results of a qualitative analysis of metallographic samples show that the transformation began on grain boundaries, forming an Fe-phase free region, but after 2 h began to take place within the eutectic region. The transformation is mostly complete after 12 h, but after 24 h of homogenization it is fully complete as all samples, except the 24 h homogenized one, contain both the metastable Al6Fe and the stable Al13Fe4 phase.

Metastability

Homogenization

10.3390/ma14237208

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Citations (9)

Štruktúra bankových úverov a ich zabezpečenie

Jožef Medved

The work deals with the problems of bank loans, their structure, with emphasis onthe most common forms of their securization and minimalization of risk. After the necessary outcome for the work, which is basicly the fundamentals of the functions of a bank with accent on commercial banking, theory of the operations of commercial banks with accent on suplying loans and the risk bond to it. In the core of the work we systemize and comment on each most used type of bank loan securization. The core also shows cases of individual layout of bank loan securization from a legal perspective and its way of use in praxis. The last part of the work is focused on aplication of the securization instruments when suplying various kinds of loans, based on the actual demands of the leaders of the slovak bank market, that ilustrating on a specific case.

Stress

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INFLUENCE OF THE COOLING RATE ON THE MICROSTRUCTURE DEVELOPMENT OF THE EN AW-AlMg4.5Mn0.7 ALLOY

Materiali in tehnologije (2012)

Natalija Dolić Jožef Medved Primož Mrvar Faruk Unkić

In this work, the course of the solidification and development of the microstructure of a sample of the EN AW-AlMg4.5Mn0.7 alloy, taken out from the edge of a slab cast with a semi-continuous, vertical, direct water-cooling process (DC) was studied. In order to determine the influence of the cooling rate on the type, the morphology and the solidification course of some phases in EN AW-AlMg4.5Mn0.7, a simultaneous thermal analysis using differential scanning calorimetry was conducted. Its results were compared with the thermodynamically calculated equilibrium phases obtained on the basis of the Thermo-Calc software. The results were also compared with the results of a simple thermal analysis, which was conducted by casting the sample in a specially designed measuring cell using the Croning process and in a cone-shaped measuring cell. The temperature intervals of the reference temperature-phase transitions (the liquidus temperature TL, the temperature evaluation of the first eutectic TE1 and the second eutectic TE2 and the solidus temperature TS) and the times of the solidification ts of the EN AW-AlMg4.5Mn0.7 alloy were determined. The mathematical models describing the changes in these parameters depending on the cooling rate were made. Using a quantitative analysis carried out with an energy dispersive spectrometer, the following microstructural constituents were determined: the intermetallic phase Al6(Fe, Mn), which, due to an unequilibrium evaluation, corresponds to the first eutectic (Al + Al6 (Fe, Mn) and the Mg2Si intermetallic phase, as the second eutectic phase (Al + Mg2Si). In addition, the presence of the pores was determined. The total surface area of some intermetallic phases and pores and their distribution in dependence on the cooling rate were examined by a scanning electron microscope.

Solidus

Liquidus

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Influence of the Cooling Rate on the Microstructure Development of the AlMg9 alloy

Zdenka Zovko Brodarac Primož Mrvar Faruk Unkić Jožef Medved

Foundry Al-Mg alloys assigned to the high pressure die casting have imposed itself in the recent time due to their high strength and ability of precipitation hardening for compositions above the 7 wt. % Mg. Influence of the cooling rate on the significant temperatures of phase changes during solidification and the grain size of AlMg9 alloy have been investigated in this paper. Cooling has been performed by the established rates of 5, 15, 30 and 100 [K/s]. Phase changes have been accompanied and identified through simultaneous and simple thermal analysis. Physical models of significant temperature and cooling rate dependence have been made. Solidification simulation has been performed through the finite elements method by the ProCast program, which has been compared with the real cooling curves. Beside this, the grain size (G) and the number of grains per surface area (NA) for each cooling rate have been determined as well as its correlation. Microstructure analysis has been performed on the optical, as well as on the scanning electron microscope (SEM) which results in visual recognition of individual phases on their morphology basis. Chemical composition determination of each phase was carried out by the energy dispersive specter (EDS). Phases Alx(MnFe)ySiz, Mg2Si and Al2Mg have been determined in the microstructure.

Foundry

Hardening (computing)

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Kvantitativna analiza mikrostrukturnih konstituenata uzoraka slitine EN AW-5083 pri različitim brzinama hlađenja

Natalija Dolić Faruk Unkić Jožef Medved Primož Mrvar

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Influence of cooling rates on temperatures phase transitions and on microstructure of aluminium alloy EN AW‐5083

Materialwissenschaft und Werkstofftechnik (2012)

Natalija Dolić Jožef Medved Primož Mrvar Faruk Unkić

Abstract The casting of different forms and dimensions of aluminium alloy EN WA‐5083 test samples and the usage of different types of mould materials resulted in achieving different cooling rates of samples. The methods used were simple thermal analysis, using casting into a measuring cell made by the Croning process and using casting into a cone‐shaped measuring cell, as well as simultaneous thermal analysis using the method of differential scanning calorimetry. Significant temperature phase transitions and times of solidification were determined, and the dependence model of the solidification time on the sample cooling rate was obtained. Determining the mean number of grains per unit area on samples after having performed the simple thermal analysis and differential scanning calorimetry makes it possible to develop a dependence model of the mean number of grains per unit area on the cooling rate. These models are the basis for carrying out numerical simulations of solidification and microstructure development in the cone‐shaped measuring cell, and the comparison of the distribution of the mean number of grains per unit area obtained by simulation with the one obtained experimentally. The obtained results represent a part of the preliminary tests of the microstructure development of industrially cast ingots of EN AW‐5083 alloy depending on the local ingot cooling rate.

Ingot

Cooling curve

10.1002/mawe.201200929

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The effect of cooling rate on the solidification and microstructure evolution in duplex stainless steel

Journal of Thermal Analysis and Calorimetry (2012)

Darja Steiner Petrovič Miran Pirnat Grega Klančnik Primož Mrvar Jožef Medved

Duplex (building)

Acicular ferrite

Acicular

Beta ferrite

10.1007/s10973-012-2370-y

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Citations (33)