Abstract
Effects of single-walled carbon nanotubes (SWNTs) on strengthening and toughening behaviors of aluminum-based composites with grain sizes ranging from nano- to micrometer have been investigated. The strength of composites is enhanced as an increase in SWNT volume and a decrease in grain size. Nanocrystalline composite containing 3.5vol.% SWNTs exhibits good ductility of ∼5% tensile elongation to failure as well as superior yield stress of ∼600MPa. However, the strengthening efficiency of SWNTs becomes half of the theoretical prediction for nanocrystalline composites due to the recovery process around the interface. Nanocrystalline composite containing 2.0vol.% SWNTs shows the fracture toughness of ∼57MPamm1/2, which is five times higher than that of starting aluminum. SWNTs may effectively block the propagation of necks and cracks, providing much improved ductility and toughness.
| Original language | English |
|---|---|
| Pages (from-to) | 2412-2417 |
| Number of pages | 6 |
| Journal | Materials Science and Engineering A |
| Volume | 528 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2011 Mar 15 |
Bibliographical note
Funding Information:This work was supported by the Second Stage of Brain Korea 21 Project in 2010 and by the Korea Science and Engineering Foundation Grant (no. 2010-0016139 ).
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering