About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Lightweight Composites, Materials & Alloys
|
| Presentation Title |
Investigation of Al-Al2O3 Metal/Ceramic Multilayers and Lightweight Composites |
| Author(s) |
Ramasis Goswami, Alex Moser, James Wollmershauser, Chandra Pande |
| On-Site Speaker (Planned) |
Ramasis Goswami |
| Abstract Scope |
Multilayers made of soft metallic and hard ceramic layers exhibit higher strength and toughness. Here we demonstrate a significantly high hardness when the individual layer thickness is well below 100nm. Nanoindentation measurements show significantly greater, 13-fold, enhancement of hardness with the decrease in layered thickness. A deviation from Hall-Petch relationship was observed as the layer thickness decreases to 10nm, suggesting grain boundary sliding mechanism would be operative. We demonstrate the multilayered structures absorb more energy under shock deformation than the nonlayered structures with similar areal densities, making the layered structures more efficient than their bulk counterparts. In addition, in this presentation, we will discuss the microstructure and mechanical properties of Ti-B4C and Al-B4C composites. |