Abstract
A polycrystalline diamond compact (PDC) is a two-stage sintered body manufactured by placing diamond powders on a WC-Co hard material and then applying the high pressure high temperature (HPHT) sintering process. This study investigated the microstructure and wear properties of the PDC depending on initial diamond particle size. Three different..... More

Abstract
In this study, planetary ball milled WC-5 wt%Co powders were sintered using the pulsed current activated sintering (PCAS) process. With this process, fully densified hard materials were obtained in a shorter time than conventional processes such as a HP and HIP. The particle sizes of the planetary ball milled WC..... More

Abstract
A thin, compact, and uniform cobalt layer was coated on ferritic stainless steel (Crofer 22 APU) by high frequency square pulsed electrodeposition in an aqueous solution containing cobalt chloride and boric acid. The effects of various electrodeposition parameters and post heat treatment on the morphology, thickness, roughness and adhesion of..... More

Abstract
The material characterization of single crystalline Cu columns was numerically carried out at the submicroscopic level. A molecular dynamics (MD) simulation was employed using the embedded-atom method (EAM) interatomic potential between a pair of Cu atoms to describe the interactions among Cu atoms. First, the relationship between mechanical properties and..... More

Abstract
Korea is famous for more than a millennium of continuous fabrication of Cu-Sn objects with near peritectic composition through a process of forging and rapid cooling at approximately 700 °C. We examined four high tin bronze hairpins excavated from two Unified Silla sites in Gyongju and found substantial variability reflecting..... More

Abstract
Nanocomposite films, which are comprised of metal nanoparticles dispersed in a matrix layer, have attracted great interest due to their unique electrical and optical properties, which are mainly due to the excitation of localized surface plasmons. In this study, we employed an alternating sputtering method to fabricate such nanocomposite films...... More

Abstract
A new aluminum welding wire with 0.8 wt% higher in Mg content was developed and compared with commercial welding wire of the 5000 series. The weldability of the Al5083 base material was evaluated using high current metal inert gas (MIG) welding, using the developed Al5183 and commercial Al5183 welding wire...... More

Abstract
Interstitial free (IF) steel disks were subjected to various degrees of revolution during application of the high-pressure torsion (HPT) process, and the resulting distributions of hardness and microstructure during the early torsion stage of high-pressure torsion (HPT) were investigated using experimental and simulation approaches. The results indicated that the deformation..... More

Abstract
In this study, Al alloy targets were fabricated using the powder metallurgy (pulsed current activated sintering, PCAS) process for metal PVD coating target applications. Powders were prepared from Al, Si and Cu ingots for sintering Al alloy compacts using the gas atomizing process. To fabricate the gas atomized Al alloy..... More

Abstract
Abstract: In this work, Zn(BH₄)₂ was added to improve the hydrogen-storage properties of MgH₂. A 99 wt% MgH₂+1 wt% Zn(BH₄)₂ sample was prepared by milling in a planetary ball mill in a hydrogen atmosphere. The proportion of the added Zn(BH₄)₂ was small (1 wt%) in order to increase hydriding and..... More

Abstract
We report the effects of Sb content on the charge transport and power factor of Bi_2-xSb_xTe₃(1.56 ≤χ≤ 1.74) compounds prepared by hot pressing. From the temperature-dependence of the electrical conductivity, it was found that the charge transport in the compounds was predominantly governed by acoustic phonon scattering, and additionally affected..... More

Abstract
In this paper, the soft magnetic properties and compaction density of Fe-Si-B-Nb-Cu nanocrystalline powder cores, mixed with two kinds of permalloy powders (Ni₇₀Fe₃₀ or Ni₅₀Fe₅₀), have been closely studied. Permalloy powders having an average diameter of 4μm were added in the range of 5 to 15 wt%, and the powder..... More

Abstract
In the photovoltaic industries, the main technique of metallization is screen printing with silver pastes, due to its simple and quick process. However, the high price of silver paste is one of the barriers to the producing of low cost solar cells. Consequently, a primary target in photovoltaic research is..... More

Abstract
Since their development in the 1970s ZrO₂ ceramics have been shown to be promising alternative materials for total hip arthroplasty (THA) and total knee arthroplasty (TKA). However, ZrO₂ is so brittle that in vivo failure can result from fracture of the ceramic femoral head and fracture of the ceramic acetabular..... More

Abstract
A new Ni based superalloy with high fatigue resistance and fine grain was considered as a material for high-pressure buckets in fossil fuel power plants. Since such buckets are usually exposed to extreme operating conditions, low cycle fatigue tests were conducted to understand the microstructure evolution of the material during..... More

Abstract
The photoreflectance (PR) method is advantageous in that it is more convenient to use at low temperature and high temperature than electroreflectance (ER) due to the modulation of the electric field. This is caused by the recombination of the surface state charge and the minority carriers generated by the laser..... More

Abstract
The Paris climate change agreement made a commitment to keep global warming below 2 ℃. The Korean government confirmed that it would seek a 37% reduction in CO₂ emissions by 2030 from the Business As Usual level. CO₂ emissions from Korean iron and steel industries account for approximately 15.4% of..... More

Abstract
This study investigated the feasibility of using HfO₂ as a dispersoid in the additive manufacturing process, compared to Y₂O₃. The effect of pre-annealing treatment was investigated too. Scanning electron microscopy (SEM) analyses revealed unusually coarse deposition layers for both the HfO₂ and Y₂O₃ dispersed oxide dispersion strengthed (ODS) steels, in..... More

Abstract
The delayed cracking behavior of deep-drawn lean duplex stainless steel (LDSS) was investigated, and compared with that of conventional metastable austenitic stainless steels (MASS). Hydrogen charging was performed by electrochemical method, and the hydrogen-charged specimens were subjected to the slow-strain-rate test. Fractures occurred along the phase boundaries in the LDSS,..... More

Abstract
Casting defects such as gas traps and oxide particles must be removed in the die-casting process in order to obtain good cast products. Experimental research is costly and time-consuming, so computer simulations are typically performed in advance and then compared to experimental results. In this paper, a magnesium alloy die-casting..... More

Abstract
Silver nanowire (AgNWs) networks offer a promising approach for producing cost effective transparent electrode materials. However, high temperature annealing is necessary to achieve low sheet resistance, which limits the use of AgNWs for low temperature processing applications such as flexible electronics, and perovskites solar cell fabrication. This study shows that..... More

Abstract
All-solid-state Li-S batteries were fabricated with lithium silicide anodes (Li₄.₄Si), sulfide-based glass electrolyte (Li₂S-P₂S₅), and a sulfur composite cathode. The sulfur based composite cathode was prepared using two methods; (Case 1) mortar-mixing and (Case 2) planetary ball milling at a rotation speed of 370 rev/min for 15 min. SEM analysis..... More

Abstract
A feasibility study on microstructure design has been carried out to improve creep rupture life in alumina-forming austenitic (AFA) Fe-14Cr-20Ni-2.3Al stainless steel with and without 2 wt% W addition. After creep tests under 780 °C/80 MPa conditions, it was observed that internal cracks initiated primarily from grain boundaries in the..... More

Abstract
We have investigated the properties of nickel silicides as catalysts for dye-sensitized solar cells (DSSCs) by preparing several nickel silicide layers with a 100 nm-Ni/Si (100) structure using silicidation annealing for 30 minutes at 300 ℃ – 900 ℃. X-ray diffraction (XRD), four-point probe, field emission scanning electron microscope (FE-SEM),..... More

Abstract
Hybrid organic/inorganic composites have recently been investigated in the thermoelectric field in an effort to interdependently manipulate the charge carriers, which are interconnected with electrical and thermal transport. The decoupling of a charge carrier’s roles in the hybrid structures can result in enhanced thermoelectric performance, by only exploiting the high..... More

Abstract
We report the effects of incorporated Cu on the thermoelectric transport properties of Bi_0.42Sb_1.58Te₃ compounds prepared by the hot pressing method. The hole concentration in the compound increased significantly with the increase in the Cu content. The acceptor role of Cu was manifested by Hall measurements and also by the..... More

Abstract
In this study, neodymium (Nd) nuclides in LiCl-KCl eutectic salts were captured and solidified using a synthetic inorganic composite (Li₂O-SiO₂-Al₂O₃-B₂O₃), a process that allows the selective capture of Nd and fabrication of a composite with Nd captured from waste, without additional additives or mixing. The Nd nuclides in the LiCl-KCl..... More

Abstract
The square loop (SL) is the typical pattern of a frequency selective surface (FSS) with high inductance (L) and capacitance (C). In this study, modified patterns including split square loop FSS (SSL-FSS) and I-type FSS (I-FSS) are proposed, and their L and C values were estimated using the equivalent circuit..... More

Abstract
The influence of ultrasonic melt treatment (UST) combined with a change in cooling rates on the microstructure and elevated temperature mechanical properties of a hypereutectic Al-18Si-4Cu-3Ni piston alloy was investigated. Microstructural observation confirmed that UST effectively refined the sizes of primary Si and intermetallic compounds (e.g. ε-Al₃Ni) while promoting their..... More

Abstract
An as-received EMC/S (electromagnetic casting and stirring)-processed Al-12Si based alloy billet was homogenized to examine its microstructure and high temperature plastic deformation behavior, using compressive tests over the temperature range from 623 to 743 K and a strain rate range from 1.0×10^-3 to 1.0×10⁰s^-1. The results were compared with samples..... More