| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VI
|
| Presentation Title |
Mechanical Behavior of Nanotwinned Al Alloys at Elevated Temperatures |
| Author(s) |
Xinghang Zhang, Qiang Li, Dongyue Xie, Jian Wang |
| On-Site Speaker (Planned) |
Xinghang Zhang |
| Abstract Scope |
Al alloys often have inherently low mechanical strength and limited operation tempera-ture. Most Al alloys have mechanical strength of 200-500 MPa, and soften rapidly at low homol-ogous temperature. We have used far-from-equilibrium approach to fabricate various nanot-winned Al solid solution alloys. Some of the nanotwinned Al alloys have flow stresses exceeding 1.5 GPa, but the mechanical strength degrade quickly when tested at 300oC. By using a solute synergy approach, we can effectively improve the thermal stability of nanotwinned Al alloys to 400oC. In situ micropillar compression studies reveal an outstanding high-temperature flow stress, greater than 1 GPa at 300 °C. DFT calculations and microscopy studies reveal the funda-mental mechanisms of high temperature stability and exceptional mechanical strength in these nanotwinned Al alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Surface Modification and Coatings, Aluminum |