Tea‐Sung Jun
성균관대학교 材料공학과 · 재료과학
Tea-Sung Jun 교수의 연구실은 마그네슘 및 티타늄 계 합금의 나노스케일 거동과 기계적 거동을 중심으로, 초미세구조와 변형 메커니즘 간의 상관관계를 규명하는 데 중점을 두고 있습니다. 특히, 나노인덴테이션, 마이크로피라미드 압축, 전자현미경 내에서의 실시간 변형 시험을 통해 국소적 응력-변형률 거동, 비례 감도, 미세구조적 기여 메커니즘을 정량적으로 분석합니다. 연구는 초고강도 및 초연성의 동시에 확보 가능한 합금 설계 원리를 제시하는 데 기여하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
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
