| 학회 | 한국재료학회 |
| 학술대회 | 2015년 봄 (05/14 ~ 05/15, 구미코) |
| 권호 | 21권 1호 |
| 발표분야 | D. 구조 재료 |
| 제목 | 분말야금법으로 제조된 나노구조 알루미늄 소재의 충격흡수능 평가 |
| 초록 | The relative abundance and high specific strength of aluminum has contributed to its prominence as a structural material for use in the aerospace and automotive industries. In both of these industries, mechanical vibration tends to cause severe damage to the system, necessitating materials with good damping capacity as well as high strength/stiffness. Although many aluminum alloys have been reported as exhibiting good mechanical damping by virtue of the interaction between dislocations and precipitates, materials exhibiting a high damping capacity usually also have a low yield stress and fatigue limit. Hence, attempts have been made to enhance the strength of the matrix by introducing hard particles such as Al2O3, SiC, BaTiO3, and TiB2. Herein, we first investigated the correlation between grain size and material damping. Aluminum samples with grain sizes ranging from tens of microns down to 60 nm were produced and their tensile properties and mechanical damping behavior were examined. Then, we also developed nanostructured aluminum matrix composites containing C60 fullerenes or Al-C nano-phases and investigated their mechanical properties and damping capacities. An obvious transition of the damping mechanism was observed at nanoscale grain sizes, and the underlying causes by grain boundaries were interpreted. Furthermore, the Al-C supersaturated nano-phases, extremely stable at high temperatures, offer superior mechanical damping behavior to monolithic aluminum throughout the temperature range of RT to 350oC as well as outstanding compressive strength of ~1 GPa. |
| 저자 | 최현주1, 최광민1, 신재혁2, 배동현3 |
| 소속 | 1국민대, 2자동차부품(연), 3연세대 |
| 키워드 | Aluminum; Fullerene; Composites; Powder processing; Grain size; Damping |
