Sungkyunkwan University · Materials Science
Professor Tea-Sung Jun's research lab specializes in the micro-mechanical behavior and deformation mechanisms of advanced light metal alloys, particularly titanium and magnesium alloys. The lab focuses on understanding strain rate sensitivity, local plasticity, and superplasticity at the microscale through in-situ mechanical testing, electron backscatter diffraction (EBSD), and nanoindentation. Key research directions include the role of microstructure—such as grain orientation, texture, and phase morphology—in determining mechanical properties under varying strain rates and temperatures, with applications in high-performance aerospace and structural materials.
Figures are computed from collected data and may differ slightly.
We have performed in-situ micropillar compression to investigate the local strain rate sensitivity of single α phase in dual-phase Ti alloy, Ti–6Al–2Sn–4Zr–2Mo (wt%). Electron backscatter diffraction (EBSD) was used to identify two grains, anticipated to primarily activate a slip on the basal and prismatic plane respectively. Comparative micropillars were fabricated within single α laths and load-hold tests were conducted with variable strain rates (on the order of 10−2 to 10−4 s−1). Local strai
Using nanoindentation we have investigated the local strain rate sensitivity in dual-phase Ti alloys, Ti–6Al–2Sn–4Zr-xMo (x = 2 and 6), as strain rate sensitivity could be a potential factor causing cold dwell fatigue. Electron backscatter diffraction (EBSD) was used to select hard and soft grain orientations within each of the alloys. Nanoindentation based tests using the continuous stiffness measurement (CSM) method were performed with variable strain rates, on the order of 10−1 to 10−3s−1. Lo
This paper describes a study of local deformation mechanisms in two-phase Ti alloy, Ti–6Al–2Sn–4Zr–2Mo, by performing in-situ micropillar compression tests. A colony microstructure was examined and select grains identified for examination were chosen with EBSD measurements. These grains were chosen to isolate individual slip systems within each test. Micropillars of tri-crystal (α–β–α) structure were fabricated from four determined regions, and compression tests were performed using a displaceme
In this study, an overview of microstructure features such as grain size, grain structure, texture and its impact on strain rate sensitivity, strain hardening index, activation energy and thermal stability for achieving superplasticity of Mg alloys are presented. The deformation behavior under different strain rates and temperatures was also elaborated. For high elongation to fracture grain boundary sliding, grain boundary diffusion is the dominant deformation mechanism. In contrast, for low-tem
• Room and cryogenic mechanical behavior of Mg-xal-1Zn-1Ca alloy ( x = 1, 2 wt.%). • Superior tensile strength achieved in AZX311 alloy without ductility trade-off. • Increased barriers to dislocation movement lead to significant hardening at CT in AZX311. • Strength-ductility synergy in AZX311 alloy at CT due to formation of stacking faults. • Higher twinning interactions during CT deformation lead to higher hardening in AZX311. This study explores the influence of Al addition on the microstruc
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