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    Wyświetlanie 1-7 z 7
    Tytuł:
    Effects of Adding Niobium and Vanadium to Fe-Based Oxide Dispersion Strengthened Alloy
    Autorzy:
    Park, Chun Woong
    Choi, Won June
    Byun, Jong Min
    Kim, Young Do
    Powiązania:
    https://bibliotekanauki.pl/articles/353024.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fe-based ODS
    vanadium
    niobium
    superalloy
    hardness
    Opis:
    In this study, the effects of adding niobium and vanadium to Fe-based oxide dispersion strengthened alloys are confirmed. The composition of alloys are Fe-20Cr-1Al-0.5Ti-0.5Y2 O3 and Fe-20Cr-1Al-0.5Ti-0.3V-0.2Nb-0.5Y2 O3. The alloy powders are manufactured by using a planetary mill, and these powders are molded by using a magnetic pulsed compaction. Thereafter, the powders are sintered in a tube furnace to obtain sintered specimens. The added elements exist in the form of a solid solution in the Fe matrix and suppress the grain growth. These results are confirmed via X-ray diffraction and scanning electron microscopy analyses of the phase and microstructure of alloys. In addition, it was confirmed that the addition of elements, improved the hardness property of Fe-based oxide dispersion strengthened alloys.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1265-1268
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    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
    Tytuł:
    Effect of Fe-Mn Solid Solution Precursor Addition on Modified AA 7075
    Autorzy:
    Kim, Min Sang
    Kim, Dae Young
    Kim, Young Do
    Choi, Hyun Joo
    Kim, Se Hoon
    Powiązania:
    https://bibliotekanauki.pl/articles/2049310.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Zn-Mg alloy
    solid solution precursor
    mechanical properties
    Opis:
    This study suggests a new way to modify the size and morphology of Al-Fe phases in modified AA 7075 by using an Fe-Mn solid solution powder as the precursor. When Fe and Mn are added in the form of a solid solution, the diffusion of Fe and Mn toward the Al is delayed, thus altering the chemical composition and morphology of the precipitates. The fine, spherical precipitates are found to provide a good balance between strength and ductility compared to the case where Fe and Mn are separately added.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 783-787
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of Aluminum Matrix Composite Reinforced with Al0.5CoCrCuFeNi High-Entropy Alloy Particles
    Autorzy:
    Kim, Min Sang
    Son, Han Sol
    Joo, Gyeong Seok
    Kim, Young Do
    Choi, Hyun Joo
    Kim, Se Hoon
    Powiązania:
    https://bibliotekanauki.pl/articles/2174583.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum matrix composite
    high entropy alloys
    reinforcement
    powder-in-tube
    stir casting
    Opis:
    The aluminum composite with dispersed high entropy alloy were developed by stir casting involving the powder-in-tube method. First, Al0.5CoCrCuFeNi high entropy alloy (HEA) powder was made by mechanical alloying, and the powder was extruded in a tube-type aluminum container to form HEA precursor. The extruded HEA precursor was then dispersed in the aluminum matrix via stir casting. As a result, Fe-Cr-Ni based high-entropy phases was uniformly formed in the aluminum matrix, revealing ~158, 166, 235% enhancement of tensile strength by incorporating 1, 3, and 5 wt% HEA particles, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1543--1546
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gas Atomization Parametric Study on the VIGA-CC Based Synthesis of Titanium Powder
    Autorzy:
    Kim, Dae-Kyeom
    Kim, Young-Il
    Lee, Hwaseon
    Kim, Young Do
    Lee, Dongju
    Lee, Bin
    Kim, Taek-Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/355636.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder production
    gas atomization
    titanium
    orifice
    Opis:
    With the recent advancement in technology for titanium metal powder injection molding and additive manufacturing, high yield and good flowability powder production is needed. In this study, titanium powder was produced through vacuum induction melting gas atomization with a cold crucible, which can yield various alloy compositions without the need for material pretreatment. The gas behavior in the injection section was simulated according to the orifice protrusion length for effective powder production, and powder was prepared based on the simulation results. The gas distribution changes with the orifice protrusion length, which changes the location of the recirculation zone and production yield of the powder. The produced powders had a spherical morphology, and the content of impurities (N, O) changed with the injected-gas purity.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 997-1000
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on the Optimization of Metalloid Contents of Fe-Si-B-C Based Amorphous Soft Magnetic Materials Using Artificial Intelligence Method
    Autorzy:
    Choi, Young-Sin
    Kwon, Do-Hun
    Lee, Min_Woo
    Cha, Eun-Ji
    Jeon, Junhyub
    Lee, Seok-Jae
    Kim, Jongryoul
    Kim, Hwi-Jun
    Powiązania:
    https://bibliotekanauki.pl/articles/2174571.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fe-based amorphous
    soft magnetic properties
    artificial intelligence
    machine learning
    random forest regression
    Opis:
    The soft magnetic properties of Fe-based amorphous alloys can be controlled by their compositions through alloy design. Experimental data on these alloys show some discrepancy, however, with predicted values. For further improvement of the soft magnetic properties, machine learning processes such as random forest regression, k-nearest neighbors regression and support vector regression can be helpful to optimize the composition. In this study, the random forest regression method was used to find the optimum compositions of Fe-Si-B-C alloys. As a result, the lowest coercivity was observed in Fe80.5Si3.63B13.54C2.33 at.% and the highest saturation magnetization was obtained Fe81.83Si3.63B12.63C1.91at.% with R2 values of 0.74 and 0.878, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1459--1463
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Prediction of Optimized Metalloid Content in Fe-Si-B-P Amorphous Alloys Using Artificial Intelligence Algorithm
    Autorzy:
    Lee, Min_Woo
    Choi, Young-Sin
    Kwon, Do-Hun
    Cha, Eun-Ji
    Kang, Hee-Bok
    Jeong, Jae-In
    Lee, Seok-Jae
    Kim, Hwi-Jun
    Powiązania:
    https://bibliotekanauki.pl/articles/2176648.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fe-based amorphous alloy
    metalloid elements
    artificial intelligence
    coercivity
    saturation magnetization
    Opis:
    Artificial intelligence operated with machine learning was performed to optimize the amount of metalloid elements (Si, B, and P) subjected to be added to a Fe-based amorphous alloy for enhancement of soft magnetic properties. The effect of metalloid elements on magnetic properties was investigated through correlation analysis. Si and P were investigated as elements that affect saturation magnetization while B was investigated as an element that affect coercivity. The coefficient of determination R2 (coefficient of determination) obtained from regression analysis by learning with the Random Forest Algorithm (RFR) was 0.95 In particular, the R2 value measured after including phase information of the Fe-Si-B-P ribbon increased to 0.98. The optimal range of metalloid addition was predicted through correlation analysis method and machine learning.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1539--1542
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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