| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Alloys: Development and Manufacturing
|
| Presentation Title |
Design and Characterization of Hierarchically-strengthened, Cast Al-Ce-Ni-Mn-Sc-Zr Alloys for High-temperature Applications |
| Author(s) |
Clement Ekaputra, Jovid U Rakhmonov, Ekin Senvardarli, David Weiss, Jon-Erik Mogonye, David C Dunand |
| On-Site Speaker (Planned) |
Clement Ekaputra |
| Abstract Scope |
We design and characterize cast Al-Ce-Ni-Mn-Sc-Zr alloys with high coarsening- and creep-resistance, enabled by strengthening at multiple length scales. The alloy was designed to combine Ce-rich and Ni-rich, micron-scale precipitates formed during eutectic solidification (providing load transfer and precipitation strengthening), Sc- and Zr-containing L12 nanoprecipitates (providing precipitation strengthening), and supersaturated Mn in solution (providing solid solution strengthening), each of which provide excellent high-temperature mechanical properties individually. Each element was added in sequence, the resulting microstructures were characterized at multiple length scales, and compositions were tuned to promote formation of the desired strengthening phases while avoiding harmful interactions between different elements. We demonstrate that combining the aforementioned phases leads to improved mechanical properties (microhardness during thermal exposure at 350 and 400°C, and compressive creep at 300°C) when compared to alloys containing single strengthening mechanisms, and the final, hexanary Al-Ce-Ni-Mn-Sc-Zr alloy shows the highest strength and creep resistance of the studied alloys. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, High-Temperature Materials, Mechanical Properties |