Pohang University of Science and Technology · Engineering
Professor Jongun Moon's research lab specializes in the development and characterization of advanced functional materials, with a primary focus on high-entropy alloys and complex oxide ceramics. The lab investigates the microstructure-property relationships in high-entropy alloys, particularly under severe plastic deformation, to understand deformation mechanisms and enhance mechanical performance. In parallel, the lab explores low-temperature sintering and microwave dielectric properties of perovskite-based ceramics for electronic and energy applications. The research integrates advanced characterization techniques such as TEM, XRD, and SEM to elucidate nanoscale heterogeneity and phase evolution.
Figures are computed from collected data and may differ slightly.
In this work, the mechanical characteristics of high-entropy alloy Co<sub>20</sub>Cr<sub>26</sub>Fe<sub>20</sub>Mn<sub>20</sub>Ni<sub>14</sub> with low-stacking fault energy processed by cryogenic and room temperature high-pressure torsion (HPT) were studied. X-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) analyses were performed to identify the phase and microstructure variation and the mechanical properties characterized by Vickers hardness mea
Strain-rate dependence in face centered cubic high entropy alloys still remains controversial despite extensive efforts on this topic. Strain-rate sensitivity reflects underlying thermally-activated deformation and the controversy boils down to the deformation mechanism. There has been disagreement even on the experimental values of the strain-rate sensitivity and activation volume. This study reviewed and analyzed the differences in experimental values and proposed mechanisms to resolve the con
The dielectric and sintering properties of (1- x )CaTiO 3 – x LaAlO 3 were investigated. The greater the amount of LaAlO 3 , which has a lower sintering temperature than CaTiO 3 , the higher the relative density is obtained. As x increased in (1- x )CaTiO 3 – x LaAlO 3 , the following phase transformation occurred: orthorhombic ( x ≤0.4) →pseudocubic ( x =0.5) →rhombohedral ( x ≥0.6). The microwave dielectric properties of ε r =37, Q · f 0 =47,000 (at 7 GHz), and τ f =5 ppm/°C were obtained at 0
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