Yunuk Heo
Pohang University of Science and Technology · Engineering
About the Lab
Professor Yunuk Heo's research lab specializes in advanced structural materials, with a focus on microstructure-property relationships in high-entropy and high-alloy steels. The lab investigates novel strengthening mechanisms such as spinodal decomposition and precipitate engineering to achieve an optimal balance between strength and ductility. Utilizing advanced electron microscopy techniques—including EELS, CBED, and electron diffraction—researchers in the lab conduct precise phase identification, thickness measurement, and nanoscale structural characterization. The work bridges fundamental materials science with practical applications in next-generation engineering alloys.
Research Overview
Research Output Trend
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Selected Papers
15Achieving an optimal balance between strength and ductility in advanced engineering materials has long been a challenge for researchers. In the field of material strengthening, most approaches that prevent or impede the motion of dislocations involve ductility reduction. In the present study, we propose a strengthening approach based on spinodal decomposition in which Cu and Al are introduced into a ferrous medium-entropy alloy. The matrix undergoes nanoscale periodic spinodal decomposition via
Two thickness measurement methods using an electron energy loss spectroscopy (EELS) and 10a convergent beam electron diffraction (CBED) were compared in an Fe-18Mn-0.7C alloy. The thin foil specimen was firstly tilted to satisfy 10a two-beam condition. Low loss spectra of EELS and CBED patterns were acquired in scanning transmission electron microscopy (STEM) and TEM-CBED modes under the two-beam condition. The log-ratio method was used for measuring the thin foil thickness. Kossel-Möllenstedt (
Research Areas
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