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    Wyświetlanie 1-13 z 13
    Tytuł:
    Wave Absorption Property of High Entropy Alloy Fabricated by Sol-Gel Process
    Autorzy:
    Yang, Suwon
    Kim, Jeong-Gon
    Jeong, Kwang-Pil
    Choi, Jin-Hyuk
    Powiązania:
    https://bibliotekanauki.pl/articles/352432.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high entropy alloy
    wave absorption property
    Opis:
    In this study, the magnetic properties and wave absorption characteristics of high entropy alloys are investigated. The high entropy alloys with FeNiMnCoCu, FeNiMnZnCo, and FeNiZnCoCu compositions were synthesized by the sol-gel method. After the sol-gel process, the annealing process and hydrogen reduction process was performed. FeNiMnCoCu and FeNiZnCoCu were revealed soft magnetic property. The saturation magnetization was 12 emu/g and 36 emu/g, respectively. And The coercive force was –45 Oe and –34 Oe, respectively. The high entropy alloy with these compositions was revealed wave absorption property at above 10 gigahertz frequency region. And it has shown the trend that wave absorption frequency has decreased with the sample thickness increasing.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1277-1280
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The kinetics of growth of high entropy alloy layers sputtered on Tungsten powder substrate
    Autorzy:
    Stefaniak, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/1179528.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    ICP analysis
    high entropy alloy
    magnetron sputtering
    nanolayers
    Opis:
    Tungsten powder particles have been encapsulated with thin CrMnFeCoNi layers by magnetron sputtering method using high entropy alloy as a target. In the course of sputtering the powder surface has been periodically analyzed. The multimetallic coatings were being dissolved in 2 M HCl and the obtained solutions were analyzed by ICP method to determine Cr3+, Mn2+, Fe2+, Co2+ and Ni2+ ions concentration. The aim of the analysis was comparison of atomic proportions of the elements in the target and in obtained layer and indirect determining of the layer thickness.
    Źródło:
    World Scientific News; 2017, 76; 60-65
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of High-Temperature Oxidizing Conditions on AlCoCrCuNi High Entropy Alloys with and without Silicon Addition
    Autorzy:
    Gawel, R.
    Rogal, Ł.
    Przybylski, K.
    Matsuda, Kenji
    Powiązania:
    https://bibliotekanauki.pl/articles/2106569.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high entropy alloy
    high temperature oxidation
    phase analysis
    alloying element
    Opis:
    Initial investigations on oxidation behaviour and phase transformations of equimolar AlCoCrCuNi high entropy alloy with and without 1 at.% silicon addition during 24-hr exposure to air atmosphere at 1273 K was carried out in this work. After determining the oxidation kinetics of the samples by means of thermogravimetric analysis, the morphology, chemical and phase compositions of the oxidized alloys were determined by means of scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction analysis. Additional cross-section studies were performed using transmission electron microscopy combined with energy dispersive X-ray spectroscopy and selected area electron diffraction. From all these investigations, it can be concluded that minor silicon addition improves the oxidation kinetics and hinders the formation of an additional FCC structure near the surface of the material.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 471--478
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Electrochemical Behaviors of Equiatomic TiMoVCrZr and Ti-rich TiMoVCrZr High-Entropy Alloys for Metallic Biomaterials
    Autorzy:
    Song, Hocheol
    Lee, Seongi
    Lee, Kwangmin
    Powiązania:
    https://bibliotekanauki.pl/articles/356543.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high entropy alloy
    TiMoVCrZr
    hot isostatic pressing
    potentiodynamic polarization
    Opis:
    The present study investigated various thermodynamic parameters, microstructures and electrochemical behaviors of TiMoVCrZr and Ti-rich TiMoVCrZr high-entropy alloys (HEAs) prepared by vacuum arc remelting. The microstructures of the alloys were analyzed using X-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FE-SEM), and potentiodynamic polarization tests. The determined thermodynamic values of the Ω-parameter and the atomic size difference (δ) for the HEAs were determined to be in the range of Ω ≥ 1.1, and δ ≤ 6.6% with valance electron configuration (VEC) ≤ 5.0, suggesting the HEAs were effective at forming solid solutions. XRD patterns of the equiatomic Ti20 Mo20 V20 Cr20 Zr20 HEA revealed four phases consisting of the body centered cubic1 (BCC1 ), BCC2 , hexagonal close-packed (HCP), and intermetallic compound Cr2 Zr phases. Three phases were observed in the XRD patterns of Ti-rich Ti40 Mo15 V15 Cr15 Zr15 (BCC, HCP, and Cr2 Zr) and a single BCC phase was observed in Ti-rich Ti60 Mo10 V10 Cr10 Zr10 HEAs. The backscattered-electron (BSE) images on the equiatomic Ti20 Mo20 V20 Cr20 Zr20 HEA revealed BCC and HCP phases with Cr2 Zr precipitates, suggesting precipitation from the HCP solid solution during the cooling. The micro-segregation of Ti-rich Ti60 Mo10 V10 Cr10 Zr10 HEAs appeared to decrease remarkably. The alloying elements in the HEAs were locally present and no phase changes occurred even after additional HIP treatment. The lowest current density obtained in the polarization potential test of Ti-rich Ti40 Mo15 V15 Cr15 Zr15 HEA was 7.12×10-4 mA/cm2 was obtained. The studied TiMoVCrZr HEAs showed improved corrosion characteristics as compared to currently available joint replacement material such as ASTM F75 alloy.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1317-1322
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Characterization of CoCrFeNiMn High Entropy Alloy Powder Processed by Gas Atomization
    Autorzy:
    Park, T. G.
    Lee, S. H.
    Lee, B.
    Cho, H. M.
    Choi, W. J.
    Kim, B. S.
    Shin, K. S.
    Kim, T.-S.
    Powiązania:
    https://bibliotekanauki.pl/articles/353649.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high entropy alloy
    gas atomization
    spark plasma sintering
    CoCrFeNiMn
    Opis:
    In this study, precisely controlled large scale gas atomization process was applied to produce spherical and uniform shaped high entropy alloy powder. The gas atomization process was carried out to fabricate CoCrFeNiMn alloy, which was studied for high ductility and mechanical properties at low temperatures. It was confirmed that the mass scale, single phase, equiatomic, and high purity spherical high entropy alloy powder was produced by gas atomization process. The powder was sintered by spark plasma sintering process with various sintering conditions, and mechanical properties were characterized. Through this research, we have developed a mass production process of high quality and spherical high entropy alloy powder, and it is expected to expand applications of this high entropy alloy into fields such as powder injection molding and 3D printing for complex shaped components.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 1055-1059
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact Behavior of the Ballistic Targets Package Composed of Dyneema Polymer and High Entropy Alloy Structures
    Autorzy:
    Voiculescu, Ionelia
    Geanta, Victor
    Chereches, Tudor
    Vizureanu, Petrica
    Stefanoiu, Radu
    Rotariu, Adrian-Nicolae
    Mitrica, Dumitru
    Powiązania:
    https://bibliotekanauki.pl/articles/2106561.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ballistic target
    high entropy alloy
    Dyneema polymer
    impact
    numerical simulation
    Opis:
    Ballistic targets are multi-material assemblies that can be made of various materials, such as metal alloys, ceramics, and polymers. Their role is to provide collective or individual ballistic protection against high-speed dynamic penetrators or kinetic fragments. The paper presents the impact behavior with incendiary perforating bullets having 7.62 mm of ballistic packages made of combinations between Dyneema ultra-high-molecular-weight polyethylene and high entropy alloy from alloying system AlCoCrFeNi, by analyzing the dynamic phenomena (deformation, perforation) that take place at high speeds. The geometry evolution of the physical model subjected to numerical simulation allows a very good control over the discretization network and also allows the export for modeling to nonlinear transient phenomena. The results obtained by numerical simulation showed that the analyzed ballistic package does not allow sufficient protection for values of impact velocities over 500 m/sec.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 569--576
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tribological Studies on AlCrFeCuCoNi High Entropy Alloy Surface Coated on Ti-6Al-4V Using Plasma Transferred Arc Technique
    Autorzy:
    Prabu, G.
    Duraiselvam, Muthukannan
    Powiązania:
    https://bibliotekanauki.pl/articles/2106576.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium alloy
    high entropy alloy
    plasma transferred arc
    PTA
    alloying
    wear mechanism
    Opis:
    AlCrFeCuCoNi high entropy particles were alloyed on Ti-6Al-4V surface using Plasma transferred arc (PTA) process. PTA alloyed surfaces were investigated for their phase formation, microhardness improvement and wear behaviour. The various wear mechanism and their corresponding surface roughness were studied. The results revealed that the dual phase of BCC and FCC microstructure along with some intermetallic compounds were grown in the alloyed region through the PTA technique and good metallurgical bonding of the alloyed region with the base material were achieved. The PTA alloyed region exhibited a hardness of 718 HV0.2 which is 2.2 times higher than the hardness of base material. The PTA alloyed samples showed higher wear resistance due to the solid solution strengthening as the HEA has high entropy of mixing that leads to the reduction of free energy of the alloyed region. It exhibited better interconnection of the coated material and superior metallurgical bonding to the base material. Frictional heat produced during the wear test has promoted the formation of FeO, Cr2O3, CuO, NiO and Al2O3 oxide film on the PTA alloyed sample. These oxide films act as a barrier between two mating surfaces and improve the tribo performance of the PTA alloyed sample.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 409--420
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Mechanical Properties of Equiatomic and Non-Equiatomic TiMoTaNbV High Entropy Alloys Prepared Using Vacuum Arc Remelting
    Autorzy:
    Lee, Seongi
    Lee, Kwangmin
    Powiązania:
    https://bibliotekanauki.pl/articles/351114.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high entropy alloy
    TiMoTaNbV
    vacuum arc remelting
    BCC phase
    micro-segregation
    Opis:
    This study investigates the microstructures and the mechanical properties of equiatomic Ti20 Mo20 Ta20 Nb20 V20 and non-equiatomic Ti40 Mo15 Ta15 Nb15 V15 and Ti60 Mo10 Ta10 Nb10 V10 HEAs using X-ray diffraction (XRD) analysis, field emission scanning electron microscope (FE-SEM), and micro-Vickers hardness test. The specimens were fabricated using the vacuum arc remelting (VAR) process and homogenized at a temperature of 1300°C for 4 h in a vacuum atmosphere. The determined thermodynamic parameters, Ω ≥ 1.1, δ ≤ 6.6%, and VEC < 6.87, suggested that the HEAs consisted of BCC solid solutions. XRD patterns of all the HEAs displayed single BCC phases. The difference in the solidification rate led to the micro-segregation associated with the elements Ta and Mo enriched in the dendrite arms and the elements V and Ti in the inter-dendritic regions. The HEA specimens showed a decrease in hardness with higher concentration of Ti element because the intrinsic hardness of Ti is lower as compared to the intrinsic hardness of Nb and Mo.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1311-1315
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Evolution of AlCuFeMnTi-0.75Si High Entropy Alloy Processed by Mechanical Alloying and Spark Plasma Sintering
    Autorzy:
    Kim, Minsu
    Sharma, Ashutosh
    Chae, Myoung Jin
    Lee, Hansung
    Ahn, Byungmin
    Powiązania:
    https://bibliotekanauki.pl/articles/2049226.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high entropy alloy
    powder metallurgy
    mechanical alloying
    spark plasma sintering
    high energy ball milling
    Opis:
    In this work, we have designed a new high entropy alloy containing lightweight elements, e.g., Al, Fe, Mn, Ti, Cu, Si by high energy ball milling and spark plasma sintering. The composition of Si was kept at 0.75 at% in this study. The results showed that the produced AlCuFeMnTiSi0.75 high entropy alloy was BCC structured. The evolution of BCC1 and BCC2 phases was observed with increasing the milling time up to 60 h. The spark plasma sintering treatment of milled compacts from 650-950°C showed the phase separation of BCC into BCC1 and BCC2. The density and strength of these developed high entropy alloys (95-98%, and 1000 HV) improved with milling time and were maximum at 850°C sintering temperature. The current work demonstrated desirable possibilities of Al-Si based high entropy alloys for substitution of traditional cast components at intermediate temperature applications.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 703-707
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Opracowanie technologii wytwarzania wielowarstwowego pancerza kompozytowego na bazie materiałów wysokoentropowych i ceramicznych
    Development of a Technology for Producing Multi-Layer Composite Armor based on High-Entropy and Ceramic Materials
    Autorzy:
    Sokół-Twarowski, Hubert
    Płodowski, Gabriel
    Rakoczy, Szymon
    Pabich, Bartłomiej
    Cichocki, Kamil
    Lisiecki, Łukasz
    Lipiński, Tomasz
    Nowacki, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/chapters/28296803.pdf
    Data publikacji:
    2023-12-14
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    badania balistyczne
    kompozyty warstwowe
    pancerz
    stop wysokoentropowy
    armor
    ballistic tests
    high-entropy alloy
    layered composites
    Opis:
    Celem rozdziału było opracowanie oraz wykonanie próbki pancerza kompozytowego składającego się z warstwy ceramicznej oraz blachy z materiału wysokoentropowego, a następnie zbadanie jakości pancerza poprzez wykonanie testów balistycznych. Procedura badawcza obejmowała dobór składu chemicznego materiału wysokoentropowego, jego wytworzenie w postaci wlewka oraz jego przeróbkę plastyczną poprzez kucie i walcowanie na gorąco. Parametry procesowe dobrano tak, aby otrzymać blachy o grubościach 2 oraz 3 mm bez naruszenia spójności materiału. Na drugim etapie prac wykonano ceramiczną część pancerza z tlenku glinu. Ostatecznie wytworzono sześć różnych wariantów próbek pancerza uwzględniających samą ceramikę, połączenie ceramiki ze stalą Hardox oraz połącznie ceramiki z wykonanym materiałem wysokoentropowym. Otrzymane próbki poddano testom balistycznym z wykorzystaniem pocisków małego kalibru. W rozdziale przedstawiono zarówno wyniki tych testów, jak i procedurę wykonania pancerza kompozytowego uwzględniającego materiał wysokoentropowy.
    The aim of the chapter was to develop and produce a composite armor sample consisting of a ceramic layer and a sheet made of a high-entropy material, and then to test the quality of the armor by conducting ballistic tests. The research procedure included selecting the chemical composition of the high-entropy material, producing it in the form of a casting, and then processing it plastically by forging and hot rolling. The process parameters were chosen to obtain sheets of 2 and 3 mm thickness without compromising the material’s integrity. In the second stage of the work, the ceramic part of the armor was made from aluminum oxide. Finally, six different variants of armor samples were produced, including: only ceramic, ceramic combined with Hardox steel, and ceramic combined with the high-entropy material. The obtained samples were subjected to ballistic tests using small-caliber projectiles. The chapter presents both the results of these tests and the procedure for producing composite armor incorporating high-entropy material.
    Źródło:
    Potencjał innowacyjny w inżynierii materiałowej i zarządzaniu produkcją; 135-143
    9788371939457
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Milling Duration on Oxide-Formation Behavior of Oxide-Dispersion-Strengthened High-Entropy Alloys
    Autorzy:
    Song, Yongwook
    Kim, Daeyoung
    Nam, Seungjin
    Lee, Kee-Ahn
    Choi, Hyunjoo
    Powiązania:
    https://bibliotekanauki.pl/articles/2049258.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    oxide dispersion strengthening
    high entropy alloy
    severe plastic deformation
    in situ second phases
    milling time effects
    Opis:
    Oxide-dispersion-strengthened high-entropy alloys were produced by hot-pressing a ball-milled mixture of Y2O3 and atomized CoCrFeMnNi powder. The effect of milling duration on grain size reduction, oxide formation behavior, and the resulting mechanical properties of the alloys was studied. Both the alloy powder size and Y2O3 particle size decreased with milling time. Moreover, the alloy powder experienced severe plastic deformation, dramatically generating crystalline defects. As a result, the grain size was reduced to ~16.746 nm and in-situ second phases (e.g., MnO2 and σ phase) were formed at the defects. This increased the hardness of the alloys up to a certain level, although excessive amounts of in-situ second phases had the reverse effect.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 735-740
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Friction Stir Welding/Processing of High Entropy Alloys (HEAs)
    Zgrzewanie tarciowe z przemieszaniem stopów o wysokiej entropii
    Autorzy:
    Mishra, Akshansh
    Powiązania:
    https://bibliotekanauki.pl/articles/1819236.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    stop o wysokiej entropii
    zgrzewanie tarciowe z przemieszaniem
    high entropy alloy
    HEA
    friction stir welding
    friction stir processing
    Opis:
    The composition of High Entropy Alloys is quite different from the existing classical engineering alloys because in near equiatomic ratios they contain multiple principal alloying elements. Design and development of high entropy alloys is very important to overcome the shortcomings of conventionally used alloys in applications where operating conditions of temperature and loading are extreme. High entropy alloys generally find applications in compressor blades of an aerospace engine, energy, and transportation industries due to its low density and high strength. In order to enhance the application of high entropy alloys, the proper selection of a feasible welding process is very important. It has been observed that when high entropy alloys are subjected to the welding process other than the Friction Stir Welding process then it will result in reduced overall strength and lower hardness in the fusion zone and heat-affected zone. In this recent paper, the application of Friction Stir Welding for joining the high entropy alloys and also using Friction Stir Processing for improving the mechanical and microstructure properties of high entropy alloys are discussed.
    Projektowanie i opracowywanie stopów o wysokiej entropii jest bardzo ważne, aby przezwyciężyć niedociągnięcia konwencjonalnie stosowanych stopów w zastosowaniach, w których warunki pracy, takie jak temperatura i obciążenie, są ekstremalne. Stopy o wysokiej entropii zwykle znajdują zastosowanie w łopatkach sprężarek silników lotniczych, energetyce i transporcie ze względu na ich niską gęstość i wysoką wytrzymałość. Aby usprawnić stosowanie stopów o wysokiej entropii, bardzo ważny jest właściwy dobór możliwego do wykonania procesu spawania. Zaobserwowano, że gdy stopy o wysokiej entropii zostaną poddane procesowi spawania innemu niż proces zgrzewania tarciowego z mieszaniem, to spowoduje to zmniejszoną ogólną wytrzymałość i niższą twardość w strefie topienia i strefie wpływu ciepła. W artykule omówiono zastosowanie zgrzewania tarciowego z przemieszaniem do łączenia stopów o wysokiej entropii, a także zastosowanie tarciowej modyfikacji z przemieszaniem do poprawy właściwości mechanicznych i mikrostrukturalnych tych stopów.
    Źródło:
    Welding Technology Review; 2021, 93, 1; 27--33
    0033-2364
    2449-7959
    Pojawia się w:
    Welding Technology Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of Molybdenum Alloy with Distributed High-Entropy Alloy Via Pressureless Sintering
    Autorzy:
    Choi, Won June
    Park, Cheon Woong
    Byun, Jong Min
    Kim, Young Do
    Powiązania:
    https://bibliotekanauki.pl/articles/353990.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    molybdenum alloy
    high-entropy alloys
    core-shell powder
    Opis:
    In this study, a molybdenum alloy with dispersed high-entropy particles was fabricated using the powder metallurgy method. The high-entropy powder, composed of Nb, Ta, V, W, and Zr elements with a same atomic fraction, was prepared via high-energy ball milling. Using this powder, an ideal core-shell powder, composed of high-entropy powder as core and Mo powder as shell, was synthesized via the milling and reduction processes. These processes enabled the realization of an ideal microstructure with the high-entropy phase uniformly dispersed in the Mo matrix. The sintered body was successfully fabricated via uniaxial compaction followed by pressureless sintering. The sintered body was analyzed by X-ray diffraction and scanning electron microscope, and the high-entropy phase is uniformly dispersed in the Mo matrix.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1269-1272
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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