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    Wyświetlanie 1-13 z 13
    Tytuł:
    Effect of Fe Content on the Mechanical Properties and Thermal Conductivity of the Al-RE Alloys
    Autorzy:
    Yoo, Hyo-Sang
    Kim, Yong-Ho
    Son, Hyeon-Taek
    Powiązania:
    https://bibliotekanauki.pl/articles/356397.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum
    extrusion
    rare earth
    thermal conductivity
    mechanical property
    Opis:
    In this study, we investigated the effect of Fe addition (0, 0.25, 0.50 and 0.75 wt.%) on the microstructure, mechanical properties and electrical conductivity of as-cast and as-extruded Al-RE alloys. As the Fe element increased by 0 and 0.75wt.%, the phase fraction increased to 5.05, 5.76, 7.14 and 7.38 %. The increased intermetallic compound increased the driving force for recrystallization and grain refinement. The electrical conductivity of Al-1.0 wt.%RE alloy with Fe addition decreased to 60.29, 60.15, 59.58 and 59.13 % IACS. With an increase in the Fe content from 0 to 0.75 wt.% the ultimate tensile strength (UTS) of the alloy increased from 74.3 to 77.5 MPa. As the mechanical properties increase compared to the reduction of the electrical conductivity due to Fe element addition, it is considered to be suitable for fields requiring high electrical conductivity and strength.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1029-1033
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Densification and Magnetic Properties of Fe Powder Compacts According to Heat-Treatment Conditions
    Autorzy:
    Yoo, Hyo-Sang
    Kim, Yong-Ho
    Kim, Cheol-Woo
    Son, Hyeon-Taek
    Powiązania:
    https://bibliotekanauki.pl/articles/2203721.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fe powder
    heat-treatment
    microstructure
    density
    Opis:
    In this study, the effects of heat-treatment conditions of Fe powder compacts on densification, microstructure, strength and magnetic properties were investigated. The prepared Fe powder was compressed in a mold of diameter 20 mm at a pressure of 800 MPa for 30 sec. This Fe powder compact was heat-treated under different atmospheres (air and 90% Ar + 10% H2 and heat-treatment temperatures (300 and 700℃). The Fe powder compacts heat-treated in an Ar+H2 mixed gas atmosphere showed a denser microstructure and higher density than the Fe powder compacts heat-treated in an air atmosphere. Oxygen content in the heat-treatment conditions played a significant role in the improvement of the densification and magnetic properties.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 47--50
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Extrusion Temperature on Extrudability of Al-Zn-Cu Based Alloy
    Autorzy:
    Kim, Yong-Ho
    Yoo, Hyo-Sang
    Lee, Kyu-Seok
    Lee, Sung-Ho
    Son, Hyeon-Taek
    Powiązania:
    https://bibliotekanauki.pl/articles/354298.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum
    extrusion
    EBSD
    mechanical property
    Opis:
    In this study, the extrusion characteristics of Al-2Zn-1Cu-0.5Mg-0.5RE alloys at 450, 500, and 550°C were investigated for the high formability of aluminum alloys. The melt was maintained at 720°C for 20 minutes, then poured into the mold at 200°C and hot-extruded with a 12 mm thickness bar at a ratio of 38:1. The average grain size was 175.5, 650.1, and 325.9 μm as the extrusion temperature increased to 450, 500 and 550°C, although the change of the phase fraction was not significant as the extrusion temperature increased. Cube texture increased with the increase of extrusion temperature to 450, 500 and 550°C. As the extrusion temperature increased, the electrical conductivity increased by 47.546, 47.592 and 47.725%IACS, and the tensile strength decreased to 92.6, 87.5, 81.4 MPa. Therefore, the extrusion temperature of Al extrusion specimen was investigated to study microstructure and mechanical properties.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1307-1310
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Si Addition on Microstructure and Mechanical Properties of the Al Alloys with High Cr Content Prepared by Gas Atomization and SPS Processes
    Autorzy:
    Kim, Yong-Ho
    Oh, Ik-Hyun
    Yoo, Hyo-Sang
    Park, Hyun-Kuk
    Lee, Jung-Han
    Son, Hyeon-Taek
    Powiązania:
    https://bibliotekanauki.pl/articles/354961.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Cr-Si
    gas atomization
    spark plasma sintering
    powder
    rapid solidification
    Opis:
    This research describes effects of Si addition on microstructure and mechanical properties of the Al-Cr based alloys prepared manufactured using gas atomization and SPS (Spark Plasma Sintering) processes. The Al-Cr-Si bulks with high Cr and Si content were produced successfully using SPS sintering process without crack and obtained fully dense specimens close to nearly 100% T. D. (Theoretical Density). Microstructure of the as-atomized Al-Cr-Si alloys with high contents of Cr and Si was composed multi-phases with hard and thermally stable such as Al13Cr4Si4, AlCrSi, Al8Cr5 and Cr3Si intermetallic compounds. The average hardness values were 703 Hv for S5, 698 Hv for S10 and 824 Hv for S20 alloy. Enhancement of hardness value was resulted from the formation of the multi-intermetallic compound with hard and thermally stable and fine microstructure by the addition of high Cr and Si using rapid solidification and SPS process.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1045-1049
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Measures for the Improvement of History Education for Chinese Students in South Korea
    Autorzy:
    Hyoung-jin, Moon
    Jong-ho, Nam
    Yong-deog, Kim
    Powiązania:
    https://bibliotekanauki.pl/articles/2031731.pdf
    Data publikacji:
    2014-09-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Chinese students
    history knowledge
    history teaching methods
    Korean history
    Opis:
    The objective of this research was to find a more effective method for the teaching of history to Chinese students studying in South Korean universities. Questionnaire surveys and interviews were conducted to investigate those students’ level of knowledge and perceptions of Korean history. Then, in history classes, four teaching methods (comparative-historical, audiovisual, history and language, and rote memorization) were applied over two weeks. Before the treatment, Chinese students said that they liked the audiovisual teaching method the most, but after taking the classes, they preferred the teaching method comparing Korean and Chinese histories. Besides the finding that the comparative method was the most popular, the responses also showed that it was the most effective one in teaching history to Chinese students.
    Źródło:
    The New Educational Review; 2014, 37; 54-65
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soaking Soybean Seeds with Abeliophyllum distichum Nakai Extract Increased the Yield and Nutritional Value of Soybean Sprouts
    Autorzy:
    Kim, Jeong-Ho
    Yoon, Yong-Han
    Dhungana, Sanjeev Kumar
    Kim, Il-Doo
    Shin, Dong-Hyun
    Powiązania:
    https://bibliotekanauki.pl/articles/2051042.pdf
    Data publikacji:
    2022-06-02
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    amino acid
    color parameters
    isoflavone
    mineral
    vitamin C
    Opis:
    Abeliophyllum distichum Nakai, an ornamental plant, contains a wide range of phytochemicals having pharmaceutical properties. The use of different plant-based extracts for the enhancement of yield and/or quality of soybean sprouts, one of the most inexpensive but nutritious food products, is common. The objective of this study was to examine the effect of A. distichum flower extract (ADE) on the yield and nutritional value of soybean sprouts. Soybean seeds were soaked in ADE solutions with concentrations (w/v) of 0.5% (ADE-0.5), 1% (ADE-1), 3% (ADE-3), and 5% (ADE-5). The effect of ADE concentration on the yield and different nutrient components varied. The highest soybean sprout yield and vitamin C content were found with ADE-3. The most abundant essential amino acid content was detected in ADE-1, whereas the greatest amounts of total isoflavones and total minerals were determined in ADE-5 and the ADE-untreated control, respectively. Overall results of yield, color, and contents of vitamin C, amino acids, and isoflavones suggest that 1% or 3% of A. distichum extract could be an optimum concentration to soak the soybean seeds for higher sprout yield and nutrient content.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2022, 72, 2; 151-158
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Deformation Temperature on the Magnetic Properties of PrFeB Alloy Fabricated by Gas Atomization
    Autorzy:
    Cho, Ju-Young
    Song, Myung-Suk
    Choa, Yong-Ho
    Kim, Taek-Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/2049154.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PrFeB alloy
    gas atomization
    plastic deformation
    rolling
    REFeB magnet
    Opis:
    To form the fine micro-structures, the Pr17Fe78B5 magnet powders were produced in the optimized gas atomization conditions and it was investigated that the formation of the textures, microstructures, and the changes in the magnetic properties with increasing the deformation temperatures and rolling directions. Due to the rapid cooling system than the casting process, the homogenous microstructures were composed of the Pr-rich and Pr2Fe14B without any oxides and α-Fe and enables grain refinement. The pore ratios were 2.87, 1.42, and 0.22% at the deformation temperatures of 600, 700, 800°C, respectively in the rolled samples to align the c-axis which is the magnetic easy axis. Because Pr-rich phase cannot flow into the pore with a liquid state at low temperature, the improvement of pore densification was gradually observed with increasing deformation temperature. To confirm the magnetic decoupling effects of Pr2Fe14B phases by Pr-rich phases, the magnetic properties were investigated in rolled samples produced at the deformation temperature of 800°C. Although the remanent field is slightly decreased by 30%, the coercivity fields increased by about 2 times than that previous casted ingot. It is suggested that the gas atomization method can be suitable for fabricating grain refined and pure PrFeB magnets, and the plastic deformation conditions and rolling directions are a critical role to manipulate microstructure and magnetic properties.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 955-958
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Powder Size on the Microstructure and Magnetic Properties of Nd-Fe-B Magnet Alloy
    Autorzy:
    Cho, Ju-Young
    Abbas, Sardar Farhat
    Choa, Yong-Ho
    Kim, Taek-Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/353634.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Nd-Fe-B
    gas atomization
    powder size
    crystal orientation
    hot deformation
    Opis:
    Rare earth Nd-Fe-B, a widely used magnet composition, was synthesized in a shape of powders using gas atomization, a rapid solidification based process. The microstructure and properties were investigated in accordance with solidification rate and densification. Detailed microstructural characterization was performed by using scanning electron microscope (SEM) and the structural properties were measured by using X-ray diffraction. Iron in the form of α-Fe phase was observed in powder of about 30 μm. It was expected that fraction of Nd2 Fe14 B phase increased rapidly with decrease in powder size, on the other hand that of α-Fe phase was decreased. Nd-rich phase diffused from grain boundary to particle boundary after hot deformation due to capillary action. The coercivity of the alloy decreased with increase in powder size. After hot deformation, Nd2 Fe14 B phase tend to align to c-axis.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 623-626
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Formation of Al-5 mass%Mg Alloy Melts by Interaction with Silica
    Autorzy:
    Kim, Sun-Ki
    Ha, Seong-Ho
    Kim, Bong-Hwan
    Yoon, Young-Ok
    Lim, Hyun-Kyu
    Kim, Shae K.
    Kim, Yong-Jig
    Powiązania:
    https://bibliotekanauki.pl/articles/2049152.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Mg system
    silica
    reduction
    Mg2Si
    phase diagram
    Opis:
    Dissolution of Si in Al-5 mass%Mg alloy melt by the reduction of SiO2 and its effect on microstructure formation of the alloy after solidification were investigated. Al-5 mass%Mg alloy without silica powder had approximately 0.05 mass%Si as an impurity. No significant difference in Si content was observed after the reaction with silica for 10 min, while the Si content increased up to about 0.12 mass% after 30 min. From the microstructure analysis and calculation of Scheil-Gulliver cooling, it was considered that as-cast microstructures of Al-5 mass%Mg-1 mass% SiO2 alloys had the distribution of eutectic phase particles, which are comprised of β-Al3Mg2 and Mg2Si phases. Based on the phase diagrams, only limited amount of Mg can be selectively removed by silica depending on the ratio of Si and Mg. Addition of silica of more than approximately 1.5 mass% in Al-5 mass%Mg alloy led to the formation of spinel and removal of both mg and Al from the melt.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 947-950
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Temperature on the Plastic Deformability of Gas Atomized NdFeB Anisotropic Magnets
    Autorzy:
    Cho, Ju-Young
    Choa, Yong-Ho
    Nam, Sun-Woo
    Rasheed, Mohammad Zarar
    Kim, Taek-Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/351923.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    NdFeB permanent magnet
    stoichiometric composition
    gas atomization
    plastic deformability
    crystal orientation
    Opis:
    NdFeB anisotropic sintered permanent magnets are typically fabricated by strip casting or melt spinning. In this study, the plastic deformability of an NdFeB alloy was investigated to study the possibility of fabricating anisotropic sintered magnets using gas atomized powders. The results show that the stoichiometric composition Nd12Fe82B6 softens at high temperatures. The aspect ratio and orientation factor of Nd12Fe82B6 billets after plastic deformation were found to increase with increasing plastic deformation temperature, particularly above 800°C. This confirms that softening at high temperatures can lead to plastic deformation of Nd2Fe14B hard magnetic phases.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1293-1296
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of Nd-Fe-B Morphology as Function of the PVP Concentration Using Electrospinning Process
    Autorzy:
    Eom, Nu Si A.
    Haq, Muhammad Aneeq
    Lee, Jimin
    Lim, Kyoung Mook
    Kim, Taek-Soo
    Choa, Yong-Ho
    Kim, Bum Sung
    Powiązania:
    https://bibliotekanauki.pl/articles/351180.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Nd2Fe14B
    1-D magnet fiber
    electrospinning
    magnet properties
    morphology
    Opis:
    In this study, we demonstrate a facile and cost-effective way to synthesize Nd-Fe-B of various shapes such as powders, rods and fibers using electrospinning, heat-treatment and washing procedures. Initially Nd-Fe-B fibers were fabricated using electrospinning. The as-spun Nd-Fe-B fibers had diameters ranging 489 to 630 nm depending on the PVP concentration in reaction solutions. The different morphologies of the Nd2Fe14B magnetic materials were related to the difference in thickness of the as-spun fibers. The relationships between the as-spun fiber thickness, the final morphology, and magnetic properties were briefly elucidated. The intrinsic coercivity of Nd2Fe14B changed with the change in morphology from powder (3908 Oe) to fiber (4622 Oe). This work demonstrates the effect of the Nd-Fe-B magnetic properties with morphology and can be extended to the experimental design of other magnetic materials.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 993-996
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Recovery of Valuable Metals in Spent Lithium-Ion Batteries by Al2O3-SiO2-CaO-Fe2O3 Slag System
    Autorzy:
    Moon, Tae Boong
    Han, Chulwoong
    Hyun, Soong-Keun
    Park, Sung Cheol
    Son, Seong Ho
    Lee, Man Seung
    Kim, Yong Hwan
    Powiązania:
    https://bibliotekanauki.pl/articles/2049176.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spent lithium-ion battery
    smelting
    Al2O3-SiO2-CaO-Fe2O3
    recovery
    slag
    Opis:
    This study investigated the recovery behavior of valuable metals (Co, Ni, Cu and Mn) in spent lithium ion-batteries based on Al2O3-SiO2-CaO-Fe2O3 slag system via DC submerged arc smelting process. The valuable metals were recovered by 93.9% at the 1250°C for 30 min on the 20 Al2O3-40SiO2-20Cao-20Fe2O3 (mass%) slag system. From the analysis of the slag by Fourier-transform infrared spectroscopy, it was considered that Fe2O2 and Al2O3 acted as basic oxides to depolymerize SiO4 and AlO4 under the addition of critical 20 mass% Fe2O3 in 20 Al2O3-40SiO2-Cao-Fe2O3 (Cao + Fe2O3 = 40 mass%). in addition, it was observed that the addition of Fe2O3 ranging between 20 and 30 mass% lowers the melting point of the slag system.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 983-986
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Efficiency Cooling System Using Additive Manufacturing
    Autorzy:
    Woo, Yeong-Jin
    Nam, Dong-Ho
    Lee, Seok-Rok
    Kim, Eun-Ah
    Lee, Woo-Jin
    Yang, Dong-Yeol
    Yu, Ji-Hun
    Park, Yong-Ho
    Lee, Hak-Sung
    Powiązania:
    https://bibliotekanauki.pl/articles/2049198.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additive manufacturing
    DfAM
    Design for Additive Manufacturing
    cooling system
    lattice structure
    simulation
    Opis:
    In this study, we propose a cooling structure manufactured using a specialized three-dimensional (3D) printing design method. A cooling performance test system with complex geometry that used a thermoelectric module was manufactured using metal 3D printing. A test model was constructed by applying additive manufacturing simulation and computational fluid analysis techniques, and the correlation between each element and cooling efficiency was examined. in this study, the evaluation was conducted using a thermoelectric module base cooling efficiency measurement system. The contents were compared and analyzed by predicting the manufacturing possibility and cooling efficiency, through additive manufacturing simulation and computational fluid analysis techniques, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 689-693
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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