TY - JOUR AU - Gubicza, Jenő AU - Máthis, Kristián AU - Nagy, Péter AU - Jenei, Péter AU - Hegedűs, Zoltán AU - Farkas, Andrea AU - Vesely, Jozef AU - Inoue, Shin-ichi AU - Drozdenko, Daria AU - Kawamura, Yoshihito TI - Annealing Behavior of a Mg-Y-Zn-Al Alloy Processed by Rapidly Solidified Ribbon Consolidation JF - MATERIALS J2 - MATERIALS VL - 17 PY - 2024 IS - 18 SN - 1996-1944 DO - 10.3390/ma17184511 UR - https://m2.mtmt.hu/api/publication/35376291 ID - 35376291 AB - Mg-Y-Zn-Al alloys processed by the rapidly solidified ribbon consolidation (RSRC) technique are candidate materials for structural applications due to their improved mechanical performance. Their outstanding mechanical strength is attributed to solute-enriched stacking faults (SESFs), which can form cluster-arranged layers (CALs) and cluster-arranged nanoplates (CANaPs) or complete the long-period stacking ordered (LPSO) phase. The thermal stability of these solute arrangements strongly influences mechanical performance at elevated temperatures. In this study, an RSRC-processed Mg—0.9%, Zn—2.05%, Y—0.15% Al (at%) alloy was heated at a rate of 0.666 K/s up to 833 K, a temperature very close to melting point. During annealing, in situ X-ray diffraction (XRD) measurements were performed using synchrotron radiation in order to monitor changes in the structure. These in situ XRD experiments were completed with ex situ electron microscopy investigations before and after annealing. At 753 K and above, the ratio of the matrix lattice constants, c/a, decreased considerably, which was restored during cooling. This decrease in c/a could be attributed to partial melting in the volumes with high solute contents, causing a change in the chemical composition of the remaining solid material. In addition, the XRD intensity of the secondary phase increased at the beginning of cooling and then remained unchanged, which was attributed to a long-range ordering of the solute-enriched phase. Both the matrix grains and the solute-enriched particles were coarsened during the heat treatment, as revealed by electron microscopy. LA - English DB - MTMT ER - TY - JOUR AU - Dobkowska, Anna AU - Adamczyk-Cieślak, Bogusława AU - Gonzalez Garcia, Marlene Aydee AU - Bednarczyk, Wiktor AU - Gubicza, Jenő AU - Jenei, Péter AU - Mukhtarova, Kamilla AU - Tkocz, Marek AU - Kuc, Dariusz AU - Mizera, Jarosław TI - Effect of High Deformation without Preheating on Microstructure and Corrosion of Pure Mg JF - METALS J2 - METALS-BASEL VL - 14 PY - 2024 IS - 8 SN - 2075-4701 DO - 10.3390/met14080949 UR - https://m2.mtmt.hu/api/publication/35215813 ID - 35215813 N1 - Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, Warsaw, 02-507, Poland Department of Materials Physics, Eotvos Lorand University, Budapest, H-1117, Hungary Faculty of Materials Engineering, Silesian University of Technology, Krasinskiego 8, Katowice, 40-019, Poland Export Date: 20 September 2024 Correspondence Address: Dobkowska, A.; Faculty of Materials Science and Engineering, Woloska 141, Poland; email: anna.dobkowska@pw.edu.pl AB - In this study, the relationship between the extrusion ratio and the corrosion resistance of pure Mg deformed using extrusion with an oscillating die (KoBo) without preheating of the initial billet was investigated. The materials investigated in this study were extruded at high deformation ratios, R1 5:1, R2 7:1, and R3 10:1, resulting in significant grain refinement from the very coarse grains formed in the initial billet to a few µm in the KoBo-extruded samples at room temperature, which is not typical for hexagonal structures. Our research clearly shows that KoBo extrusion improves the corrosion performance of pure Mg, but there is no straightforward dependence between the extrusion ratios and corrosion resistance improvement. Although it was expected that the smallest grain size should provide the highest corrosion resistance, the dislocation density accumulated in the grain interiors during deformation at the highest extrusion ratio, R3 10:1, supports dissolution reactions. This, in turn, provides the answers for the greater grain size observed after deformation at R2 7:1, where dynamic recovery prevailed over dynamic recrystallization. This situation led to the annihilation of dislocation, leading to better corrosion resistance of the respective alloy. Therefore, the alloy with the greatest grain size has the best corrosion resistance. LA - English DB - MTMT ER - TY - JOUR AU - Dobkowska, Anna AU - Lofaj, František AU - González García, Marlene Aydee AU - Martinez, Diana C. AU - Kulikowski, Krzysztof AU - Paradiso, Alessia AU - Idaszek, Joanna AU - Gubicza, Jenő AU - Jenei, Péter AU - Kabátová, Margita AU - Kvetková, Lenka AU - Lisnichuk, Maksym AU - Inoue, Shinichi AU - Kawamura, Yoshishito AU - Święszkowski, Wojciech TI - Structural, mechanical, corrosion, and early biological assessment of tantalum nitride coatings deposited by reactive HiTUS JF - SURFACE AND COATINGS TECHNOLOGY J2 - SURF COAT TECH VL - 493 PY - 2024 SN - 0257-8972 DO - 10.1016/j.surfcoat.2024.131267 UR - https://m2.mtmt.hu/api/publication/35197104 ID - 35197104 LA - English DB - MTMT ER - TY - JOUR AU - Gubicza, Jenő AU - Máthis, K. AU - Nagy, P. AU - Jenei, Péter AU - Hegedűs, Z. AU - Farkas, A. AU - Veselý, J. AU - Inoue, S.-I. AU - Drozdenko, D. AU - Kawamura, Y. TI - In-situ study of the microstructure evolution during tension of a Mg-Y-Zn-Al alloy processed by rapidly solidified ribbon consolidation technique JF - Journal of Magnesium and Alloys J2 - J MAGNES ALLOY PY - 2024 SN - 2213-9567 DO - 10.1016/j.jma.2024.05.008 UR - https://m2.mtmt.hu/api/publication/34922353 ID - 34922353 N1 - Department of Materials Physics, Faculty of Science, Eötvös Loránd University, Pázmány P. sétány 1/A, Budapest, H-1117, Hungary Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Praha 2, Czech Republic Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, Hamburg, 22603, Germany Magnesium Research Center, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan Export Date: 6 June 2024 Correspondence Address: Gubicza, J.; Department of Materials Physics, Pázmány P. sétány 1/A, Hungary; email: jeno.gubicza@ttk.elte.hu LA - English DB - MTMT ER - TY - JOUR AU - Lofaj, František AU - Kabátová, Margita AU - Kvetková, Lenka AU - Lisnichuk, Maksym AU - Albov, Dmitry AU - Jenei, Péter AU - Gubicza, Jenő TI - Structure, mechanical and tribological properties of Ta-xN coatings deposited by reactive HiTUS JF - JOURNAL OF THE EUROPEAN CERAMIC SOCIETY J2 - J EUR CERAM SOC VL - 44 PY - 2024 IS - 9 SP - 5326 EP - 5339 PG - 14 SN - 0955-2219 DO - 10.1016/j.jeurceramsoc.2023.11.020 UR - https://m2.mtmt.hu/api/publication/34376832 ID - 34376832 LA - English DB - MTMT ER - TY - JOUR AU - Berecz, Tibor AU - Mészáros, István AU - Jenei, Péter TI - Investigation of Spinodal Decomposition in Isothermally Heat Treated LDX 2101 type Duplex Stainless Steel at 475 °C JF - PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING J2 - PERIOD POLYTECH MECH ENG VL - 68 PY - 2024 IS - 1 SP - 38 EP - 43 PG - 6 SN - 0324-6051 DO - 10.3311/PPme.23385 UR - https://m2.mtmt.hu/api/publication/34273364 ID - 34273364 AB - Spinodal decomposition of the ferritic phase, a thermally induced phase transformation process is studied in an LDX 2101 type leanduplex stainless steel by different examination methods. This phase transformation in duplex stainless steels has special importance because it is responsible for the so called "475 degrees C embrittlement". This deterioration process causes a decrease in toughness and corrosion resistance. Fe-Cr alloys, thus several stainless steels, are susceptible to the spinodal decomposition at intermediate and low temperatures (<600 C). Therefore, it is important to study this phenomenon in novel lean-duplex stainless steels as well. Our results revealed that spinodal decomposition occurs to a lesser extent in the studied type of lean-duplex stainless steel but its effect is not negligible in applications. LA - English DB - MTMT ER - TY - CHAP AU - Tamás, RADNAI AU - Tünde, T JUHÁSZ AU - Juhász, András AU - Jenei, Péter ED - Jozef, Hanč ED - Zuzana, Ješková ED - Marián, Kireš TI - Measuring the Effectiveness of Motion Simulation Programs in High School Physics Education T2 - GIREP-EPEC Conference 2023 : PROCEEDINGS − Book of Extended Abstracts PB - Slovak Physical Society CY - Kosice SN - 9788089855223 PY - 2023 SP - 186 EP - 187 PG - 2 UR - https://m2.mtmt.hu/api/publication/34479047 ID - 34479047 LA - English DB - MTMT ER - TY - JOUR AU - Vavrik, M. AU - Vári, G.P. AU - Jenei, Péter TI - The simplest schlieren imaging using a smartphone JF - PHYSICS TEACHER J2 - PHYS TEACH VL - 61 PY - 2023 IS - 9 SP - 804 EP - 805 PG - 2 SN - 0031-921X DO - 10.1119/5.0162015 UR - https://m2.mtmt.hu/api/publication/34446729 ID - 34446729 N1 - Export Date: 21 December 2023; Cited By: 0 LA - English DB - MTMT ER - TY - JOUR AU - Radnai, Tamás AU - Juhász, T.T. AU - Juhász, András AU - Jenei, Péter TI - A Simulation Experiment Using Algodoo: What Force Makes a Car Accelerate, and What Does the Acceleration Depend On? JF - PHYSICS TEACHER J2 - PHYS TEACH VL - 61 PY - 2023 IS - 4 SP - 271 EP - 275 PG - 5 SN - 0031-921X DO - 10.1119/5.0059836 UR - https://m2.mtmt.hu/api/publication/33744758 ID - 33744758 N1 - Jedlik Ányos Secondary School, Budapest, Hungary Karinthy Frigyes Secondary School, Budapest, Hungary Eötvös Loránd University, Budapest, Hungary Export Date: 12 April 2023; Cited By: 0; Correspondence Address: T. Radnai; Jedlik Ͽ nyos Secondary School, Budapest, Hungary; email: rad.tamas@gmail.com LA - English DB - MTMT ER - TY - JOUR AU - Luong, Nguyen Hoang AU - Trung, Truong Thanh AU - Hong, Tran Thi AU - Nam, Nguyen Hoang AU - Phan, Manh-Huong AU - Jenei, Péter AU - Lábár, János AU - Gubicza, Jenő TI - Relating the magnetic coercivity to the L10 ordered FePd phase in annealed FexPd100-x nanoparticles JF - APPLIED PHYSICS A - MATERIALS SCIENCE AND PROCESSING J2 - APPL PHYS A-MATER VL - 128 PY - 2022 IS - 10 PG - 11 SN - 0947-8396 DO - 10.1007/s00339-022-06059-x UR - https://m2.mtmt.hu/api/publication/33118481 ID - 33118481 AB - Rare-earth-free or iron-based permanent nanomagnets are emerging as promising candidates for energy-conversion and information technologies. In this interest, FexPd100-x nanoparticles (x = 50, 55, 60, and 63) were prepared from iron acetate and palladium acetate by sonoelectrodeposition. After annealing the nanoparticles at various temperatures from 450 to 700 °C for 1 h, structural changes were observed, and the samples exhibit hard magnetic properties that depend strongly on chemical composition and annealing temperature. The major phase in the as-prepared nanoparticles has a disordered face-centered cubic structure, which, upon annealing, transforms into a multi-phase material containing a L10 ordered FePd phase. The fractions of different phases present in the annealed samples, including that of the L10 phase as functions of chemical composition and annealing temperature, are quantified by means of X-ray diffraction and scanning transmission electron microscopy. Magnetic measurements show the desirable hard magnetic properties for the samples annealed at 550–600 °C. A correlation between the magnetic coercivity and the L10 ordered FePd phase fraction is established for the first time in the FexPd100-x nanoparticles. LA - English DB - MTMT ER -