TY - JOUR AU - Pethő, Dániel AU - Kurusta, Tamás AU - Koncz-Horváth, Dániel AU - Kristály, Ferenc AU - Mikó, Tamás AU - Pal, Manoj Kumar AU - Gácsi, Zoltán TI - Morphological and mechanical evolution of α-Al2O3 reinforced Mo Cu alloy obtained by planetary ball milling JF - JOURNAL OF MANUFACTURING PROCESSES J2 - J MANUFACT PROCES VL - 103 PY - 2023 SP - 1 EP - 10 PG - 10 SN - 1526-6125 DO - 10.1016/j.jmapro.2023.08.034 UR - https://m2.mtmt.hu/api/publication/34123864 ID - 34123864 N1 - Export Date: 08 March 2024 LA - English DB - MTMT ER - TY - JOUR AU - Kovács, Sándor Endre AU - Mikó, Tamás AU - Troiani, Enrico AU - Markatos, Dionysios AU - Pethő, Dániel AU - Gergely, Gréta Katalin AU - Varga, László AU - Gácsi, Zoltán TI - Additive Manufacturing of 17-4PH Alloy: Tailoring the Printing Orientation for Enhanced Aerospace Application Performance JF - AEROSPACE J2 - AEROSPACE-BASEL VL - 10 PY - 2023 IS - 7 PG - 13 SN - 2226-4310 DO - 10.3390/aerospace10070619 UR - https://m2.mtmt.hu/api/publication/34107259 ID - 34107259 AB - Additive manufacturing (AM) is one of the fastest-growing markets of our time. During its journey in the past 30 years, its key to success has been that it can easily produce extremely complex shapes and is not limited by tooling problems when a change in geometry is desired. This flexibility leads to possible solutions for creating lightweight structural elements while keeping the mechanical properties at a stable reserve factor value. In the aerospace industry, several kinds of structural elements for fuselage and wing parts are made from different kinds of steel alloys, such as 17-4PH stainless steel, which are usually milled from a block material made using conventional processing (CP) methods. However, these approaches are limited when a relatively small element must withstand greater forces that can occur during flight. AM can bridge this problem with a new perspective, mainly using thin walls and complex shapes while maintaining the ideal sizes. The downside of the elements made using AM is that the quality of the final product is highly dependent on the build/printing orientation, an issue extensively studied and addressed by researchers in the field. During flight, some components may experience forces that predominantly act in a single direction. With this in mind, we created samples with the desired orientation to maximize material properties in a specific direction. The goal of this study was to demonstrate that an additively manufactured part, produced using laser powder bed fusion (LPBF), with a desired build orientation has exceptional properties compared to parts produced via conventional methods. To assess the impact of the build orientation on the LPBF parts’ properties, one-dimensional tensile and dynamic fracture toughness tests were deployed. LA - English DB - MTMT ER - TY - JOUR AU - Mikó, Tamás AU - Pethő, Dániel AU - Gergely, Gréta Katalin AU - Markatos, Dionysios AU - Gácsi, Zoltán TI - A Novel Process to Produce Ti Parts from Powder Metallurgy with Advanced Properties for Aeronautical Applications JF - AEROSPACE J2 - AEROSPACE-BASEL VL - 10 PY - 2023 IS - 4 PG - 13 SN - 2226-4310 DO - 10.3390/aerospace10040332 UR - https://m2.mtmt.hu/api/publication/33871196 ID - 33871196 AB - Titanium and its alloys have excellent corrosion resistance, heat, and fatigue tolerance, and their strength-to-weight ratio is one of the highest among metals. This combination of properties makes them ideal for aerospace applications; however, high manufacturing costs hinder their widespread use compared to other metals such as aluminum alloys and steels. Powder metallurgy (PM) is a greener and more cost and energy-efficient method for the production of near-net-shape parts compared to traditional ingot metallurgy, especially for titanium parts. In addition, it allows us to synthesize special microstructures, which result in outstanding mechanical properties without the need for alloying elements. The most commonly used Ti alloy is the Ti6Al4V grade 5. This workhorse alloy ensures outstanding mechanical properties, demonstrating a strength which is at least twice that of commercially pure titanium (CP-Ti) grade 2 and comparable to the strength of hardened stainless steels. In the present research, different mixtures of both milled and unmilled Cp-Ti grade 2 powder were utilized using the PM method, aiming to synthesize samples with high mechanical properties comparable to those of high-strength alloys such as Ti6Al4V. The results showed that the fine nanoparticles significantly enhanced the strength of the material, while in several cases the material exceeded the values of the Ti6Al4V alloy. The produced sample exhibited a maximum compressive yield strength (1492 MPa), contained 10 wt.% of fine (milled) particles (average particle size: 3 μm) and was sintered at 900 °C for one hour. LA - English DB - MTMT ER - TY - THES AU - Pethő, Dániel TI - Al2O3 részecskékkel erősített Mo-Cu alapú nanokompozitok fejlesztése PY - 2023 SP - 96 DO - 10.14750/ME.2023.013 UR - https://m2.mtmt.hu/api/publication/33650708 ID - 33650708 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Pethő, Dániel AU - Kurusta, Tamás AU - Kristály, Ferenc AU - Mikó, Tamás AU - Gácsi, Zoltán TI - The effect of ball to powder ratio on the processing of a novel Mo-Cu-Al2O3 composite JF - INTERNATIONAL JOURNAL OF REFRACTORY METALS AND HARD MATERIALS J2 - INT J OF REFRACT MET AND HARD MATERIALS VL - 101 PY - 2021 PG - 9 SN - 0958-0611 DO - 10.1016/j.ijrmhm.2021.105657 UR - https://m2.mtmt.hu/api/publication/32181263 ID - 32181263 AB - In the present article a 45Mo-45Cu-10Al2O3 (wt%) nano-composite was produced by mechanical alloying, shaped by cold pressing then by hot pressing at 950 °C. Our aim was to investigate the effect of different ball to powder ratio (BPR) on the particle size and shape, as well as on the material composition. Investigations were done with XRD, SEM and for hot pressed specimens Brinell hardness measurement. Lower BPR resulted in nano-sized crystallites in the powder, a homogenous phase distribution and higher BPR resulted in even smaller crystallite sizes, but with ZrO2 contamination from the milling equipment. The milling resulted in two separate fractions in the metallic phases separated by crystallite size, strain and lattice parameter. After hot pressing, the lower BPR powders developed a homogeneous, evenly distributed microstructure. Cu recrystallized during hot pressing, but still remained nanocrystalline, the crystallite size of Mo and α-Al2O3 decreased even more due to crystallite deformation and in the case of Mo, the lattice strain values indicates that recovery had also happened. The heating eliminated the crystal defects at highly strained areas and the subsequent cooling evened out the stresses in the respective metallic phases. The inner grain structure was revealed by etching, showing that α-Al2O3 particles congregated only at the Mo grain boundaries, but penetrated the Cu grains. The lattice strain values combined with the BSE images reveal that the Cu is the main matrix of the α-Al2O3 particles. The results indicate that the α-Al2O3 particles induced Particle Stimulated Nucleation (PSN) in the Cu explaining its moderate crystallite size increase. The hot pressed samples of higher BPR had higher ceramic (ZrO2 and α-Al2O3) content, resulting in higher hardness, but lower relative density (92.4%), compared to the samples of lower BPR, which reached 97.2% relative density and hardness still significantly higher than MoCu alloys. LA - English DB - MTMT ER - TY - JOUR AU - Mikó, Tamás AU - Kristály, Ferenc AU - Pethő, Dániel AU - Kissné Svéda, Mária AU - Karacs, Gábor AU - Gergely, Gréta Katalin AU - Gácsi, Zoltán AU - Roósz, András TI - Investigation of nanocrystalline sintered W-25 wt% Cu composite JF - INTERNATIONAL JOURNAL OF REFRACTORY METALS AND HARD MATERIALS J2 - INT J OF REFRACT MET AND HARD MATERIALS VL - 95 PY - 2021 PG - 10 SN - 0958-0611 DO - 10.1016/j.ijrmhm.2020.105438 UR - https://m2.mtmt.hu/api/publication/31668507 ID - 31668507 N1 - A cikkben/előadásban/tanulmányban ismertetett kutató munka az EFOP-3.6.1-16-00011 jelű „Fiatalodó és Megújuló Egyetem – Innovatív Tudásváros – a Miskolci Egyetem intelligens szakosodást szolgáló intézményi fejlesztése” projekt részeként – a Széchenyi 2020 keretében – az Európai Unió támogatásával, az Európai Szociális Alap társfinanszírozásával valósul meg = “The described article/presentation/study was carried out as part of the EFOP-3.6.1-16-00011 “Younger and Renewing University – Innovative Knowledge City – institutional development of the University of Miskolc aiming at intelligent specialisation” project implemented in the framework of the Szechenyi 2020 program. The realization of this project is supported by the European Union, co-financed by the European Social Fund.” LA - English DB - MTMT ER - TY - JOUR AU - Pethő, Dániel AU - Hlavács, Adrienn AU - Benke, Márton TI - THE COMPARISON OF AA1060 AND AA3003 ALUMINIUM ALLOYS BY THEIR CRYSTALLOGRAPHIC TEXTURE JF - MATERIALS SCIENCE AND ENGINEERING: A PUBLICATION OF THE UNIVERSITY OF MISKOLC J2 - MATER SCI ENGINEERING MISKOLC VL - 45 PY - 2020 IS - 1 SP - 227 EP - 232 PG - 6 SN - 2063-6792 UR - https://m2.mtmt.hu/api/publication/31783094 ID - 31783094 LA - English DB - MTMT ER - TY - JOUR AU - Pethő, Dániel TI - A fülesedés és a textúra-komponensek közötti kapcsolat 3103-as alumínium ötvözet lemezekben JF - DIÁKTUDOMÁNY: A MISKOLCI EGYETEM TUDOMÁNYOS DIÁKKÖRI MUNKÁIBÓL J2 - DIÁKTUDOMÁNY VL - 11 PY - 2018 SP - 48 EP - 51 PG - 4 SN - 2062-0721 UR - https://m2.mtmt.hu/api/publication/31799802 ID - 31799802 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Pethő, Dániel AU - Mikó, Tamás AU - Gácsi, Zoltán ED - [European, Powder Metallurgy Association] TI - The Characterization of Cold Pressed Molybdenum Powders Reinforced with Ceramic Particles T2 - Euro PM2018 Congress Proceedings PB - European Powder Metallurgy Association (EPMA) CY - Shrewsbury SN - 9781899072507 PY - 2018 SP - 6 EP - 10 PG - 5 UR - https://m2.mtmt.hu/api/publication/31333640 ID - 31333640 N1 - Scopus:hiba:85084161171 2022-10-11 15:49 év nem egyezik LA - English DB - MTMT ER - TY - CONF AU - Pethő, Dániel AU - Mikó, Tamás AU - Gácsi, Zoltán TI - The Characterization of Ceramic Particles Reinforced Molybdenum Powder Produced by High Energy Ball Milling T2 - 2018 World Congress on Powder Metallurgy, Congress Proceedings PY - 2018 SP - 118 EP - 122 PG - 5 UR - https://m2.mtmt.hu/api/publication/31333588 ID - 31333588 LA - English DB - MTMT ER -