Tamas Bubonyi

@uni-miskolc.hu

Institute of Physcal Metallurgy, Metalforming and Nanotechnology
University of Miskolc

Tamas Bubonyi


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https://researchid.co/btomihun

RESEARCH, TEACHING, or OTHER INTERESTS

Materials Science, Metals and Alloys
17

Scopus Publications

129

Scholar Citations

6

Scholar h-index

2

Scholar i10-index

Scopus Publications

  • Reinterpretation and demonstration of deformation ageing in cold-formable steels
    Béla Kondás, Zoltán Péter Kovács, Tamás Bubonyi, Máté File, Dániel Nemes, Valéria Mertinger
    Production Engineering, 2026
    Many processing companies use some grades of steel for cold forming. Due to ageing, the formability of unalloyed mild steel sheets deteriorates over time; their formability is not uniform, and surface defects appear, which in many practical applications leads to scrap. This can be particularly important for processing companies when selecting machine settings, as there may be differences in the properties of materials from different manufacturers and the properties of materials of different ages from the same manufacturer. We investigated the ageing behaviour of DC01 steel grade by testing many samples from the third day after production up to one year. Various methods were used to detect ageing, such as tensile tests at different test speeds and supplemented with a digital image correlation (DIC) system, thermo-electric power measurement, deep drawing cup tests, and Nakajima tests. We showed that a reinterpretation of the definition of ageing is necessary. Standard tensile testing can no longer detect the ageing tendency of steels manufactured using the latest technology. However, when supplemented with DIC, these tests show ageing with high sensitivity. Among the used methods the applicability of this technique in industrial material testinglaboratories is the most recommended.
  • Direct drive rotational friction welding of in-situ produced hybrid metal foam-filled tubes
    Alexandra KEMÉNY, Gábor PADOS, Tamás BUBONYI, Imre Norbert ORBULOV
    Materials Today Communications, 2026
    In this work, unique hybrid metal foam-filled tubes incorporating low-cost ceramic fillers and sacrificial NaCl space holders were produced via a novel in-situ low-pressure AlSi12 infiltration and joined by direct drive rotational friction welding. The fabricated composite and hybrid foam-filled tubes (Ø25×160 mm, with 1.5 mm thick outer wall) achieved bulk densities of 1.68 ± 0.02 g/cm 3 and 1.71 ± 0.02 g/cm 3 , respectively, which increased by up to 7.6% post-weld due to friction welding induced compaction. Computed tomography and optical metallography revealed a coherent circular-patterned weld interface and, under moderate forge pressure (2500 kPa), a preserved open-cell architecture with narrow weld thickness (219 ± 176 µm) and minimal filler fragmentation. Three-point bend tests on Ø35 mm retained weld diameter, joined hybrid foam-filled tubes demonstrated an effective bend strength of 12.1 ± 0.39 MPa, corresponding to an average of 20.4 ± 5.0% improvement when retaining a larger weld-zone diameter, with fractures consistently propagating through the open-cell foam core rather than the weld line. These results confirm that direct drive rotational friction welding provides high-integrity bonds in hybrid foam-filled tubes, offering a scalable route to lightweight structural components. • A novel hybrid metal foam–filled tube (FFT) structure was developed. • Hybrid FFTs combine ceramic-filled and open-cell zones for tailored porosity. • Friction welding is viable for cohesively joining metal foam-filled tubes. • The joined composite and hybrid FFTs had a narrow (200–300 µm) hardened weld region. • Fractures propagate through the open-cell foam core instead of the weld line.
  • The effect of various bulk filling techniques on the mechanical and structural characteristics of class I biomimetic composite dental fillings
    Alexandra Kemény, Péter Zoltán Farkas, Borbála Leveles, Levente Borhy, Dóra Károly, Tamás Bubonyi, András Volom, Gábor Braunitzer, David S. Alleman, Balázs Varbai
    Scientific Reports, 2025
    Tooth degradation develops easily over time from initial caries to deeper cavities. The quality and durability of restorations are crucial in a patients’ life, and it is primarily determined by the mechanical properties of the restorations. Clinicians and engineers apply biomimetic science in dentistry to mimic the natural design of the teeth and emphasize careful material selection as well as bond strength between the tissue and artificial material. The aim of this research was to develop and compare five different bulk filling restoration techniques for high C-factor (5.0) Class I cavities and determine the most durable technique. Tensile bond strength between the dentin and the filling, as well as the inner structure of the filling was measured via computed tomography, scanning electron microscopy and mechanical testing methods. It was found that the semi-direct bulk filling technique (bulk filling with an extra, indirect curing step) can increase the tensile bond strength on average by 58% (51.1 ± 12.2 MPa) compared to the direct bulk filling method with the same materials (32.4 ± 8.2 MPa). The introduced semi-direct technique allows bulk filling to be used on Class I cavities while achieving a high bond strength, resulting in highly durable and reproducible restorations.
  • AN OUTSTANDING PRE-SCYTHIAN BURIAL FROM BÜKKÁBRÁNY-KÁLVÁRIA
    Zita Hrabák, Tamás Pusztai, Gyula Szekeres, Ádám Balázs, Kristóf Fülöp, László Gucsi, Erika Gál, Piroska Rácz, Béla Török, Krisztina Dúzs, Tamás Bubonyi, András Gömöri, Klára P. Fischl
    Archeometriai Muhely, 2025
    The study presents a burial, and its assemblage discovered at Bükkábrány-Kálvária (Borsod-Abaúj-Zemplén County, NE-Hungary) dating to the 9th–early 8th century BC, along with additional pieces of bronze artefacts collected nearby from a systematic metal detector survey. The grave held the remains of an adult female and an infant. Scientific examinations were carried out to analyse the burial assemblage. In addition to the anthropological and archaeozoological analysis of the human and animal remains, the chemical composition of the recovered gold beads was analysed by ED-XRF spectrometry. The measurement results revealed that the beads were likely to have been made using the same or very similar base material, relatively high silver-containing (14–16 wt%) native gold. The residue adhering to the surface of the antler plate likely contains the remains of a plain weave textile. Cobalt blue, dark green, pink, and natural colour threads forming the finely woven fabric were documented by digital microscope images. CT scans were used to visualise the decoration of the plate in order to preserve the corroded textile remains. Among the stray finds of horse equipment, the cheekpiece was analysed by ED-XRF spectrometry; based on the results, the bit was made of tin bronze with around 9–10 wt% tin content in the original alloy. The archaeological evaluation of the Pre-Scythian finds from Bükkábrány revealed complex cultural interactions between East, North, and West.
  • The effect of unintended porosity on the first compressive stress maximum of alumina hollow sphere-filled bimodal composite metal foams
    Alexandra Kemény, Tamás Bubonyi, Imre Norbert Orbulov
    Heliyon, 2024
    Bimodal composite metal foams made from Al99.5 aluminium and quasi-eutectic Sr-modified AlSi12 matrix were investigated, where the bimodality was introduced by two alumina hollow sphere sets with nominal diameters of Ø7.0 and Ø2.4 mm in various volume concentrations. The research aimed to determine the effect of the cell structure (especially the unintended porosity) on the first compressive stress maximum, depending on the applied matrix material. The various features of the cell structure were quantitatively measured in composite metal foams by filtering raw computed tomography analysis data. The casting porosity, the wetting porosity, the porosity from the various-sized hollow spheres, and the partially matrix-filled hollow spheres have been successfully distinguished based on volumetric and geometrical conditions, such as sphericity and compactness. The unintended porosity (as the sum of the casting porosity and the wetting porosity) influences the first compressive stress maximum of the Al99.5 matrix composite metal foams. In contrast, for the AlSi12Sr bimodal foams, the results correlated with the total porosity values. The first compressive stress maximum could be estimated well from the compressive yield strength of the matrix and the total porosity of the foam.
  • Microstructural characterization of bimodal composite metal foams under compression with machine learning
    Tamás Bubonyi, Péter Barkóczy, Alexandra Kemény, Zoltán Gácsi
    Composites Part A Applied Science and Manufacturing, 2024
    Cellular materials are gaining popularity in today’s major sectors. The aim is to develop high-performance materials to meet customer and application demands. This study revolves around the beginning of the failure; computed tomography and statistical image analysis assisted with machine learning were employed to quantitatively characterize the occurring processes within the structure at the beginning of the well-known plateau effect. Simple techniques (e.g., easily obtainable shape parameters, forest decision, 2D image slices) were employed to sort the structural elements into seven classes based on their visual appearances. The presented method can provide additional information about the fracture mode of the different foams, possibly applying/extending them for other types of closed-cell (composite or not) foams.
  • Simulation of loss-of-coolant accident with thin-walled cladding tubes
    Róbert Farkas, Zoltán Hózer, Zoltán Kis, Erzsébet Perez-Feró, Márton Király, Márta Horváth, Tamás Novotny, Péter Szabó, Tamás Bubonyi
    Nuclear Materials and Energy, 2024
    • integral test, accident, nuclear fuel, zirconium. A loss-of-coolant accident in a nuclear power plant was simulated in the CODEX-SLIM experiment. The electrically heated fuel rod bundle contained cladding material used at a VVER-440 power plant. The maximum temperature reached 900 °C and the experiment was terminated by water quenching. The condition of the bundle was investigated using non-destructive and destructive techniques. According to the experimental data, the fuel rods would maintain their integrity during a design basis loss-of-coolant accident.
  • Detection of Porosity in Impregnated Die-Cast Aluminum Alloy Piece by Metallography and Computer Tomography
    Mihály Réger, József Gáti, Ferenc Oláh, Richárd Horváth, Enikő Réka Fábián, Tamás Bubonyi
    Crystals, 2023
    The porosity of die-cast aluminum alloys is a determining factor for the quality of the product. In this paper, we studied the porosity of a selected part of a die-cast AlSi9Cu3(Fe) compressor part by computer tomography and metallography. In the case of this part, the achievable resolution by CT, a non-destructive testing method, was 30 μm—this method could not detect smaller cavities. Based on metallographic analysis, the percentage of defects larger than 30 μm ranges from 10 to 30% of the total number of defects, which represents 75–95% of the defective area (area ratio). Impregnation with methacrylate resin (used to seal cavities to prevent leakage) can be detected with UV-illuminated optical microscopic examination on metallographically prepared specimens. As confirmed by scanning electron microscopy, partial filling and partial impregnation can occur in a system of shrinkage cavities.
  • Interactions of primary intermetallic compound particles and double oxide films in liquid aluminum alloys
    Gábor Gyarmati, Tamás Bubonyi, György Fegyverneki, Monika Tokár, Tamás Mende
    Intermetallics, 2022
    One of the main challenges in processing aluminum alloys in the liquid state is the avoidance of the formation of double oxide films and their incorporation into the final parts. Bifilms in liquid alloys can act as heterogeneous nucleation sites for primary intermetallic compounds (IMCs), which phenomenon can be utilized for their aided sedimentation. In this study, TiAlSi IMCs were used for the sedimentation treatment of a liquid Al–Si–Mg–Cu alloy. The interactions between IMCs and bifilms were studied by computed tomography (CT) and scanning electron microscopy (SEM), while the changes in melt quality were assessed by the CT analysis of reduced pressure test (RPT) samples. Additionally, the grain refinement effect of Ti-addition was studied by grain size measurements. It was found that (Al, Si)3Ti particles became attached to bifilms, and their simultaneous sedimentation resulted in lowered porosity. However, the attachment of IMCs to the surface oxide layer caused Ti-macrosegregation in the top region of the melt. The attachment of (Al, Si)3Ti intermetallic particles is caused by the heterogeneous nucleation of IMCs on oxide films and the partial engulfment of oxide film segments during the growth of the (Al, Si)3Ti particles. Investigations of the pore surfaces support the theory of bifilm-initiated pore formation.
  • Manufacturing and Comparison of Sr Modified or Unmodified AlSi12 Eutectic Alloy Matrix Unimodal and Bimodal Composite Metal Foams
    Borbála Leveles, Alexandra Kemény, Tamás Bubonyi, Imre Norbert Orbulov
    Advanced Engineering Materials, 2022
    Metallic foams are designed to be generally used by the transportation industry as energy‐absorbing reinforcements in bumper panels or as permanent cores for weight reduction. In composite metal foams (CMFs), the second phase is usually formed by hollow spheres or closed‐wall porous materials responsible for the gas (void) intake. Herein, three types of samples are compared: CMFs with unimodal small, unimodal large, and bimodally mixed small and large ceramic hollow spheres. Unmodified AlSi12 or Sr modified AlSi12 alloy is infiltrated between the spheres with low‐pressure infiltration to form the cellular structure. The effect of Sr modification on the matrix material properties and the matrix–filler interface layer is investigated. The samples are evaluated and compared based on microstructural analysis and standardized compressive tests; the fracture mechanism of the structure is analyzed using computed tomography measurements at different deformation states. The aim of this research is to develop high‐performance unimodal and bimodal CMFs, which have better specific mechanical properties than conventional metal foams, and to investigate the effect of Sr modification on the material properties. With these foams, additional weight reduction and higher energy absorption can be achieved, primarily used as automotive components.
  • Effects of Additives on the Mechanical Properties of Aluminum Foams
    Szilvia Gyöngyösi, András Gábora, Gábor Balogh, Gábor Kalácska, Tamás Bubonyi, Tamás Mankovits
    Mechanisms and Machine Science, 2022
  • Effect of particle size and volume ratio of ceramic hollow spheres on the mechanical properties of bimodal composite metal foams
    Alexandra Kemény, Borbála Leveles, Tamás Bubonyi, Imre Norbert Orbulov
    Composites Part A Applied Science and Manufacturing, 2021
  • Comparison of CT and metallographic method for evaluation of microporosities of dye cast aluminum parts
    Tamás Bubonyi, Péter Barkóczy, Zoltán Gácsi
    Iop Conference Series Materials Science and Engineering, 2020
  • Conservation purpose material testing of corrosion products on outdoor bronze statues
    Szilvia Szilvia, Melinda Nagy, Laura Juhász, Tamás Bubonyi, Barkóczy Péter, György Forgács, Eszter Szatmáriné Bakonyi
    Iop Conference Series Materials Science and Engineering, 2020
  • Evaluation of the kinetics of recrystallization based on scaling 1D cellular automaton by DSC measurements
    Tamás Bubonyi, Péter barkóczy, Szilvia Gyöngyösi
    Journal of Physics Conference Series, 2019
  • Conservation purpose material testing of corrosion products on outdoor bronze statues in Museum Park of Hungarian National Museum
    2019 Imeko Tc4 International Conference on Metrology for Archaeology and Cultural Heritage Metroarchaeo 2019, 2019
  • Simulation of crystallographic changes during recrystallization by one-dimensional cellular automaton
    T Bubonyi, P Barkóczy
    Iop Conference Series Materials Science and Engineering, 2018

RECENT SCHOLAR PUBLICATIONS

  • Reinterpretation and demonstration of deformation ageing in cold-formable steels
    B Kondás, ZP Kovács, T Bubonyi, M File, D Nemes, V Mertinger
    Production Engineering 20 (2), 50 , 2026
    2026
  • Direct drive rotational friction welding of in-situ produced hybrid metal foam-filled tubes
    A Kemeny, G Pados, T Bubonyi, IN Orbulov
    Materials Today Communications 52, 115165 , 2026
    2026
  • The effect of various bulk filling techniques on the mechanical and structural characteristics of class I biomimetic composite dental fillings
    A Kemény, PZ Farkas, B Leveles, L Borhy, D Károly, T Bubonyi, A Volom, ...
    Scientific Reports 15 (1), 862 , 2025
    2025
    Citations: 2
  • Bimodális kompozit fémhab zömítés hatására kialakuló szerkezetének jellemzése gépi tanulás segítségével
    T Bubonyi
    Miskolci Egyetem , 2025
    2025
  • The effect of unintended porosity on the first compressive stress maximum of alumina hollow sphere-filled bimodal composite metal foams
    A Kemény, T Bubonyi, IN Orbulov
    Heliyon 10 (20) , 2024
    2024
    Citations: 4
  • Microstructural characterization of bimodal composite metal foams under compression with machine learning
    T Bubonyi, P Barkóczy, A Kemeny, Z Gacsi
    Composites Part A: Applied Science and Manufacturing 185, 108292 , 2024
    2024
    Citations: 6
  • Simulation of loss-of-coolant accident with thin-walled cladding tubes
    R Farkas, Z Hozer, Z Kis, E Perez-Feró, M Király, M Horváth, T Novotny, ...
    Nuclear Materials and Energy 40, 101695 , 2024
    2024
  • Detection of porosity in impregnated die-cast aluminum alloy piece by metallography and computer tomography
    M Réger, J Gáti, F Oláh, R Horváth, ER Fábián, T Bubonyi
    Crystals 13 (7), 1014 , 2023
    2023
    Citations: 6
  • Interactions of primary intermetallic compound particles and double oxide films in liquid aluminum alloys
    G Gyarmati, T Bubonyi, G Fegyverneki, M Tokár, T Mende
    Intermetallics 149, 107681 , 2022
    2022
    Citations: 27
  • Properties of Aluminum Foams
    T Bubonyi, T Mankovits
    Machine and Industrial Design in Mechanical Engineering: Proceedings of KOD … , 2022
    2022
  • Manufacturing and comparison of Sr modified or unmodified AlSi12 eutectic alloy matrix unimodal and bimodal composite metal foams
    B Leveles, A Kemény, T Bubonyi, IN Orbulov
    Advanced Engineering Materials 24 (1), 2100384 , 2022
    2022
    Citations: 6
  • Effects of additives on the mechanical properties of aluminum foams
    S Gyöngyösi, A Gábora, G Balogh, G Kalácska, T Bubonyi, T Mankovits
    International Conference on Machine and Industrial Design in Mechanical … , 2021
    2021
    Citations: 1
  • Effect of particle size and volume ratio of ceramic hollow spheres on the mechanical properties of bimodal composite metal foams
    A Kemény, B Leveles, T Bubonyi, IN Orbulov
    Composites Part A: Applied Science and Manufacturing 140, 106152 , 2021
    2021
    Citations: 61
  • A homokmagokból eltérő öntési hőmérsékletnél felszabaduló gázok nyomásváltozásának és az öntvényben megdermedt gázhólyagok kialaku-lásának vizsgálata
    M Laura, K Ágota, B Tamás, V László
    Kohászat, 10 , 2021
    2021
  • Comparison of CT and metallographic method for evaluation of microporosities of dye cast aluminum parts
    T Bubonyi, P Barkóczy, Z Gácsi
    IOP Conference Series: Materials Science and Engineering 903 (1), 012038 , 2020
    2020
    Citations: 6
  • Conservation purpose material testing of corrosion products on outdoor bronze statues
    S Szilvia, M Nagy, L Juhász, T Bubonyi, B Péter, G Forgács, ...
    IOP Conference Series: Materials Science and Engineering 903 (1), 012037 , 2020
    2020
    Citations: 1
  • The Role of Metallography in the Restoration of an Incense Burner from Persia
    T Bubonyi, S Gyöngyösi, L Nagy, P Barkóczy
    Materials Science and Engineering 45 (1), 29-36 , 2020
    2020
  • Evaluation of the kinetics of recrystallization based on scaling 1D cellular automaton by DSC measurements
    T Bubonyi, P Barkóczy, S Gyöngyösi
    Journal of Physics: Conference Series 1270 (1), 012034 , 2019
    2019
  • Local Annealing of Cold Rolled Aluminum Sheets by LASER Treatment
    T Bubonyi, Z Bánóczy, P Barkóczy, G Buza
    2019
    Citations: 3
  • Comparison of the Recrystallized Microstructure of 8006 and Al1. 4Si Alloy after Local Laser Treatment
    T Bubonyi, Z Bánóczy, P Barkóczy
    Materials Science and Engineering 44 (2), 5-12 , 2019
    2019

MOST CITED SCHOLAR PUBLICATIONS

  • Effect of particle size and volume ratio of ceramic hollow spheres on the mechanical properties of bimodal composite metal foams
    A Kemény, B Leveles, T Bubonyi, IN Orbulov
    Composites Part A: Applied Science and Manufacturing 140, 106152 , 2021
    2021.0
    Citations: 61
  • Interactions of primary intermetallic compound particles and double oxide films in liquid aluminum alloys
    G Gyarmati, T Bubonyi, G Fegyverneki, M Tokár, T Mende
    Intermetallics 149, 107681 , 2022
    2022.0
    Citations: 27
  • Microstructural characterization of bimodal composite metal foams under compression with machine learning
    T Bubonyi, P Barkóczy, A Kemeny, Z Gacsi
    Composites Part A: Applied Science and Manufacturing 185, 108292 , 2024
    2024.0
    Citations: 6
  • Detection of porosity in impregnated die-cast aluminum alloy piece by metallography and computer tomography
    M Réger, J Gáti, F Oláh, R Horváth, ER Fábián, T Bubonyi
    Crystals 13 (7), 1014 , 2023
    2023.0
    Citations: 6
  • Manufacturing and comparison of Sr modified or unmodified AlSi12 eutectic alloy matrix unimodal and bimodal composite metal foams
    B Leveles, A Kemény, T Bubonyi, IN Orbulov
    Advanced Engineering Materials 24 (1), 2100384 , 2022
    2022.0
    Citations: 6
  • Comparison of CT and metallographic method for evaluation of microporosities of dye cast aluminum parts
    T Bubonyi, P Barkóczy, Z Gácsi
    IOP Conference Series: Materials Science and Engineering 903 (1), 012038 , 2020
    2020.0
    Citations: 6
  • The effect of unintended porosity on the first compressive stress maximum of alumina hollow sphere-filled bimodal composite metal foams
    A Kemény, T Bubonyi, IN Orbulov
    Heliyon 10 (20) , 2024
    2024.0
    Citations: 4
  • Local Annealing of Cold Rolled Aluminum Sheets by LASER Treatment
    T Bubonyi, Z Bánóczy, P Barkóczy, G Buza
    2019.0
    Citations: 3
  • Simulation of crystallographic changes during recrystallization by one-dimensional cellular automaton
    T Bubonyi, P Barkóczy
    IOP Conference Series: Materials Science and Engineering 426 (1), 012007 , 2018
    2018.0
    Citations: 3
  • Evaluation of Eutectic Structure in Aluminum Alloys
    T Bubonyi, P Barkoczy
    DOI , 0
    Citations: 3
  • The effect of various bulk filling techniques on the mechanical and structural characteristics of class I biomimetic composite dental fillings
    A Kemény, PZ Farkas, B Leveles, L Borhy, D Károly, T Bubonyi, A Volom, ...
    Scientific Reports 15 (1), 862 , 2025
    2025.0
    Citations: 2
  • Effects of additives on the mechanical properties of aluminum foams
    S Gyöngyösi, A Gábora, G Balogh, G Kalácska, T Bubonyi, T Mankovits
    International Conference on Machine and Industrial Design in Mechanical … , 2021
    2021.0
    Citations: 1
  • Conservation purpose material testing of corrosion products on outdoor bronze statues
    S Szilvia, M Nagy, L Juhász, T Bubonyi, B Péter, G Forgács, ...
    IOP Conference Series: Materials Science and Engineering 903 (1), 012037 , 2020
    2020.0
    Citations: 1
  • Reinterpretation and demonstration of deformation ageing in cold-formable steels
    B Kondás, ZP Kovács, T Bubonyi, M File, D Nemes, V Mertinger
    Production Engineering 20 (2), 50 , 2026
    2026.0
  • Direct drive rotational friction welding of in-situ produced hybrid metal foam-filled tubes
    A Kemeny, G Pados, T Bubonyi, IN Orbulov
    Materials Today Communications 52, 115165 , 2026
    2026.0
  • Bimodális kompozit fémhab zömítés hatására kialakuló szerkezetének jellemzése gépi tanulás segítségével
    T Bubonyi
    Miskolci Egyetem , 2025
    2025.0
  • Simulation of loss-of-coolant accident with thin-walled cladding tubes
    R Farkas, Z Hozer, Z Kis, E Perez-Feró, M Király, M Horváth, T Novotny, ...
    Nuclear Materials and Energy 40, 101695 , 2024
    2024.0
  • Properties of Aluminum Foams
    T Bubonyi, T Mankovits
    Machine and Industrial Design in Mechanical Engineering: Proceedings of KOD … , 2022
    2022.0
  • A homokmagokból eltérő öntési hőmérsékletnél felszabaduló gázok nyomásváltozásának és az öntvényben megdermedt gázhólyagok kialaku-lásának vizsgálata
    M Laura, K Ágota, B Tamás, V László
    Kohászat, 10 , 2021
    2021.0
  • The Role of Metallography in the Restoration of an Incense Burner from Persia
    T Bubonyi, S Gyöngyösi, L Nagy, P Barkóczy
    Materials Science and Engineering 45 (1), 29-36 , 2020
    2020.0