| 학회 | 한국재료학회 |
| 학술대회 | 2012년 가을 (11/07 ~ 11/09, 라카이샌드파인 리조트) |
| 권호 | 18권 2호 |
| 발표분야 | E. 구조 재료(Structural Materials) |
| 제목 | Application of Neutron Diffraction to Study Plastic Deformation and Fracture Mechanics in Structural Materials |
| 초록 | Application of neutron diffraction in the characterization of engineering materials becomes increasingly prevalent due to their unique ability to provide microscopic insights into the mechanical behavior of advanced materials. In this work, the use of neutron diffraction method to study plastic deformation and fracture mechanics is emphasized with various case studies. More specifically, in-situ neutron diffraction has been employed to examine the plastic deformation behavior at the microstructural level in an extruded binary Mg-9wt%Al alloy. Lattice strains and diffraction peak intensity variations are measured during uniaxial tension and compression, cyclic tension, cyclic compression, tension-first cyclic loading and compression-first cyclic loading, in order to investigate the relative activities of deformation twinning and dislocation slip and their influence on the macroscopic plastic deformation behavior. The experimental data are used to validate an elastic-viscoplastic self-consistent model of polycrystal plasticity, from which the critical resolved shear stresses and hardening behavior of the available slip and twinning modes can be determined. In addition, a neutron-diffraction strain mapping around the crack tip has been used to understand the fatigue crack growth mechanisms of various metallic alloys (e.g., superalloy, stainless steel, magnesium alloys etc.). The distribution of residual stresses and the evolution of the stress fields around the crack tip are quantitatively determined to identify the fatigue crack growth mechanisms. The transfer phenomena of stress concentration in the fatigue overload case and twinning-detwinning activities near the crack tip in magnesium alloy are elucidated. |
| 저자 | 이수열 |
| 소속 | 충남대 |
| 키워드 | Neutron Diffraction |
