Byungchul Kang
KAIST
Ultimate tensile strengthCrystal structureWhiskersBall millVickers hardness testFabricationCrystalliteSolid solutionRefractory (planetary science)ElectronPrecipitation hardeningNanoparticleDislocationComposite materialIndentation hardnessFlexural strengthMetallurgyGrain sizeMaterials scienceSolid solution strengtheningCorrosionSuperalloyDiffractionSpark plasma sinteringAbnormal grain growthBorideSinteringPitting corrosionOxideAlloyHigh entropy alloysPitting resistance equivalent numberQuinaryHeat resistantMechanical propertyCompressive strengthPassivationElongationPhase (matter)RefractoryGrain boundaryBoronCoaxialCarbideChemical vapor depositionDopingDuctilityVolume fractionDielectric spectroscopyFOIL methodSingle crystalNanowireAnnealing (metallurgy)Powder metallurgyStrengthening mechanisms of materialsGrain boundary strengtheningMicrostructureDispersion (chemistry)Atomic ratioNanocompositeGrain growth
13Publications
5H-index
162Citations
Publications 14
Newest
#1Byungchul Kang (KAIST)H-Index: 5
#2Taeyeong Kong (KAIST)H-Index: 4
Last. Soon Hyung Hong (KAIST)H-Index: 63
view all 6 authors...
Abstract null null The effect of boron (B) addition on the microstructure and mechanical properties of a refractory high-entropy alloy (RHEA) was investigated. The Al0.1CrNbVMo RHEA was doped with 0.015 at.% of B by the powder metallurgical process, and its mechanical properties were compared with undoped RHEA. The microstructures of the undoped and doped RHEAs consisted of a single body-centered cubic matrix phase with homogeneously distributed Al2O3 inclusions. The doped B atoms segregated alo...
Source
#1Sunghwan Jin (UNIST: Ulsan National Institute of Science and Technology)H-Index: 12
#2Byungchul Kang (KAIST)H-Index: 5
Last. Rodney S. RuoffH-Index: 165
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Abstract Abnormal grain growth of polycrystalline iron (Fe) foil up to grains of 1 cm × 2.2 cm in size, is reported. Pre-strain generated by plastic deformation promoted the abnormal grain growth during post-strain annealing, resulting in large area regions close to single crystal within the foil. The number of nucleus/nuclei and maximum grain size for the abnormal grain growth were highly affected by the plastic deformation conditions as they cause different stored energies in the foils. These ...
2 CitationsSource
#1Taeyeong Kong (KAIST)H-Index: 4
#2Byungchul Kang (KAIST)H-Index: 5
Last. Soon Hyung Hong (KAIST)H-Index: 63
view all 4 authors...
Abstract A Ni46Co22Al12Cr8Fe8Ti3Mo1 high entropy superalloy (Ni46 HESA) was fabricated by a powder metallurgical (PM) process. The composition of the alloy was determined through consideration of its PM processability. The alloy had a density of 7.82 g cm−3, which is lower than that of conventional Ni-base superalloys. The microstructure of the bulk alloy consisted of a face-centered cubic γ matrix and an L12 γ′ precipitate with minor amounts of Al2O3 and TiC inclusions. To leverage the advantag...
7 CitationsSource
#1Byungchul Kang (KAIST)H-Index: 5
#2Taeyeong Kong (KAIST)H-Index: 4
Last. Soon Hyung Hong (KAIST)H-Index: 63
view all 4 authors...
Abstract Light and strong AlxCrNbVMo (x = 0, 0.5, and 1.0) refractory high-entropy alloys (RHEAs) were designed and fabricated via a the powder metallurgical process. The microstructure of the AlxCrNbVMo alloys consisted of a single BCC crystalline structure with a sub-micron grain size of 2−3 μm, and small amounts (
6 CitationsSource
#1Sung Chan Yoo (KAIST)H-Index: 4
#2Byungchul Kang (KAIST)H-Index: 5
Last. Soon Hyung Hong (KAIST)H-Index: 63
view all 5 authors...
Novel one-dimensional template-grown coaxial SiC@carbon nanotubes (SiC@CNTs) were fabricated using a chemical vapor deposition method. To facilitate the formation of SiC on CNT template, a molecular-level mixing process was used to coat the surface of commercial multiwalled carbon nanotubes (MWCNTs) by Fe2O3. These Fe-CNTs were transformed into SiC@CNT nanotubes, which were then mixed with Al6061 alloy and consolidated by spark plasma sintering to obtain Al6061-SiC@CNT nanocomposites. The additi...
6 CitationsSource
#1Byungchul Kang (KAIST)H-Index: 5
#2Taeyeong Kong (KAIST)H-Index: 4
Last. Soon Hyung Hong (KAIST)H-Index: 63
view all 4 authors...
Abstract The present work reports the microstructure and tensile properties of a Ni-rich high-entropy superalloy (HESA; Ni46Co22Al12Cr8Fe8Ti3Mo1) having outstanding tensile properties, including yield strength of 1355 MPa and fracture elongation of 8.7%. Powder metallurgical (PM) processes were used to fabricate the present HESA with homogeneous and fine-grained microstructure. A large number of γʹ precipitates were homogeneously distributed in a face-centered cubic (FCC) matrix. By using PM pro...
5 CitationsSource
#1Ahmad Raza (KAIST)H-Index: 5
#2Syed Abdulahad (KAIST)H-Index: 1
Last. Soon Hyung Hong (KAIST)H-Index: 63
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Abstract High entropy alloys with superior hardness and corrosion resistance have proved themselves excellent coating materials. In this study, a pitting corrosion resistance analysis of AlxCrFeMoV alloys (with x = 0, 0.2, 0.6, 1), with outstanding mechanical features, has been conducted. The study was motivated by their exceedingly high pitting resistant equivalent number (PREN) values, in the range of 80–100. Powder metallurgy techniques, including mechanical alloying and spark plasma sinterin...
24 CitationsSource
#1Byungchul Kang (KAIST)H-Index: 5
#2Taeyeong Kong (KAIST)H-Index: 4
Last. Soon Hyung Hong (KAIST)H-Index: 63
view all 5 authors...
Abstract We fabricated Nb42Mo20Ti13Cr12V12Ta1, a novel refractory high-entropy alloy (RHEA) enriched with niobium (Nb), by following a high-energy ball milling and spark plasma sintering (SPS) method. The microstructure of the bulk RHEA formed a single body-centered cubic (BCC) matrix with in-situ-formed carbide dispersoids. The combination of the effect of the severe deformations caused by the milling, the short sintering time, and the impedance of the grain growth caused by the dispersoids led...
8 CitationsSource
#1Byungchul Kang (KAIST)H-Index: 5
#2Junho Lee (KAIST)H-Index: 9
Last. Soon Hyung Hong (KAIST)H-Index: 63
view all 4 authors...
Abstract A light-weight refractory Al0.1CrNbVMo high entropy alloy (HEA) was fabricated by high energy ball milling and spark plasma sintering (SPS). The alloy had a density of 7.96 g/cm3, which is lower than that of conventional Ni-base superalloys. Optimum milling time was decided by the microstructure analysis of the HEA powders. The microstructure of the bulk alloy consisted of a body-centered cubic (BCC) matrix with a minor amount of alumina inclusions. The Al0.1CrNbVMo HEA exhibited outsta...
26 CitationsSource
#1Ahmad Raza (KAIST)H-Index: 5
#2Byungchul Kang (KAIST)H-Index: 5
Last. Soon Hyung Hong (KAIST)H-Index: 63
view all 5 authors...
Abstract A novel CrFeMoVMn x high entropy alloy (HEA) system was devised after screening done with thermodynamic constraints. The Mn content was varied (x = 0, 0.5, 1 atomic ratio), with other elements kept in equiatomic ratios, to determine the effect of paired sigma-forming element (PSFE) content on microstructural and mechanical behavior. Alloys were successfully fabricated using a powder metallurgical method after mechanical alloying (MA) for an optimized minimum milling time. The milled pow...
20 CitationsSource