S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Material Science and Engineering (재료공학부) Theses (Master's Degree_재료공학부)
Evaluation of Stacking Fault Energy in Anisotropic FCC Metal by Nanoindentation
나노 압입을 통한 이방성 FCC 금속에서의 적층결함에너지 평가
- 공과대학 재료공학부
- Issue Date
- 서울대학교 대학원
- Stacking fault energy (SFE); nanoindentation; dislocation II nucleation; dislocation energy barrier; anisotropy
- 학위논문 (석사)-- 서울대학교 대학원 : 재료공학부, 2016. 2. 한흥남.
- Stacking fault energy (SFE) is one of the most important mechanical properties in structural material, which is the energy increment due to stacking sequence distortion caused by partial dislocations. New method for evaluating stacking fault energy by nanoindentation was suggested based on continuum model considering dislocation nucleation and stacking fault energy.
The self-energy of dislocation and resolved shear stresses at dislocation nucleation were calculated in elastically anisotropic material with cubic structure. For the elastic self-energy, Chu’s formulations were used. Nanoindentation experiment, electron backscatter diffraction (EBSD) analysis, and finite element (FE) simulation of nanoindentation were combined. The obtained dislocation nucleation shear stress was in the order of theoretical strength of dislocation nucleation and the stacking fault energy evaluated was on the range of reported SFE values.