Abstract
In this study, the liquation cracking temperature range (LCTR) of over-aged 247LC superalloy repair welds was quantitatively evaluated using spot-Varestraint testing, especially for application in the repair weld heat-affected zone (HAZ). The metallurgical mechanism of the evaluated liquation cracking susceptibility and variation of the LCTRs of the over-aged 247LC superalloys..... More

Abstract
This article shows how fractures in the Si₃N₄ layer, which comprises the top layer of semiconductor devices encapsulated utilizing a lead-on-chip (LOC) packaging technique, are influenced by changes in the lead-frame materials and thermal-cycling test conditions. Using thermal-cycling tests, it was found that fractures in the Si 3 N 4..... More

Abstract
We fabricated an additive-free MAX(Ti₃AlC₂) phase Li-ion battery (LIB) electrode using the electrophoretic deposition (EPD) method. In this study, MAX, a precursor of MXene, which has recently been receiving great attention as a negative electrode material for LIBs, was manufactured as a coin cell through EPD rather than the conventional..... More

Abstract
With increasing interest in energy harvesting using heat as a next-generation eco-friendly energy source, organic-inorganic perovskite materials have emerged as promising materials for thermoelectric devices. In particular, the photo-Seebeck effect of halide perovskite materials has attracted attention due to their wide optical absorption spectrum and large diffusion length, depending on..... More

Abstract
Environmentally sustainable thermoelectric technologies can be more broadly applied in industries once the performance of thermoelectric materials is improved. Several approaches have been proposed to improve the electronic transport properties of thermoelectric materials. The effects of each approach on the electronic properties can be evaluated by changes in the band..... More

Abstract
In this study, a mechanical exfoliation method was developed for the synthesis of high purity Bi₂Te₃, Sb₂Te₃, and Bi_0.5Sb_1.5Te₃ flakes. The synthesized Bi₂Te₃, Sb₂Te₃, and Bi_0.5Sb_1.5Te₃ flakes were characterized by atomic force microscope, Raman spectroscopy, and photoluminescence (PL). The effect of the thickness of the Bi₂Te₃, Sb₂Te₃, and Bi_0.5Sb_1.5Te₃ flakes..... More

Abstract
As interest in hydrogen energy grows, eco-friendly methods of producing hydrogen are being explored. CuBi₂O₄ is one of the p-type semiconductor cathode materials that can be used for photoelectrochemical hydrogen production via environment-friendly water electrolysis. CuBi₂O₄ has a bandgap of 1.5 – 1.8 eV which allows it to photogenerate electrons..... More

Abstract
In the present study, we analyzed the thermal and mechanical properties of Cu-graphite composites (CGCs) with spatially anisotropic graphite layers. These composites were fabricated using a combination of electroless plating and spark plasma sintering (SPS) processes. Thermal conductivities and thermal expansion coefficients of the composites were measured using differential thermal..... More

Abstract
The efficiency of gas turbines depends on the gas turbine working temperature. Single crystal blades are being applied more often than equiaxed blades in gas turbine engines, to increase the turbine inlet temperature, resulting in enhanced turbine engine efficiency. Single crystal blades endure creep conditions at high temperature better than..... More

Abstract
There is substantial concern about the phase change to artificial ferrite or martensite in commercial austenitic stainless steels during intense focused-ion-beam milling. In this work, severe Ga ion milling to prepare microscale samples was found to produce thin transformed layers on the surface of austenitic stainless steel. The surface BCC..... More