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1
Content available Fabrication of Aluminum Matrix Composite Reinforced with Al0.5CoCrCuFeNi High-Entropy Alloy Particles
Kim Min Sang, Son Han Sol, Joo Gyeong Seok, Kim Young Do, Choi Hyun Joo, Kim Se Hoon
Archives of Metallurgy and Materials
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2022
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Vol. 67, iss. 4
1543--1546
EN
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.
2
Content available Effect of Fe-Mn Solid Solution Precursor Addition on Modified AA 7075
Kim Min Sang, Kim Dae Young, Kim Young Do, Choi Hyun Joo, Kim Se Hoon
Archives of Metallurgy and Materials
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2021
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Vol. 66, iss. 3
783--787
EN
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.
3
Content available Gas Atomization Parametric Study on the VIGA-CC Based Synthesis of Titanium Powder
Kim Dae-Kyeom, Kim Young-Il, Lee Hwaseon, Kim Young Do, Lee Dongju, Lee Bin, Kim Taek-Soo
Archives of Metallurgy and Materials
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2020
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Vol. 65, iss. 3
997--1000
EN
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.
4
Content available Fabrication of Molybdenum Alloy with Distributed High-Entropy Alloy Via Pressureless Sintering
Choi Won June, Park Cheon Woong, Byun Jong Min, Kim Young Do
Archives of Metallurgy and Materials
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2020
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Vol. 65, iss. 4
1269--1272
EN
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.
5
Content available Effects of Adding Niobium and Vanadium to Fe-Based Oxide Dispersion Strengthened Alloy
Park Chun Woong, Choi Won June, Byun Jong Min, Kim Young Do
Archives of Metallurgy and Materials
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2020
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Vol. 65, iss. 4
1265--1268
EN
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.
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