| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
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| Symposium
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Microstructural Template Consisting of a Face-Centered Cubic Matrix with Ordered Precipitates: Microstructural Evolution and Properties
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| Presentation Title |
Sc-free Nanoprecipitate-strengthened Aluminum Alloys with Exceptional Creep Resistance |
| Author(s) |
Richard A. Michi, David N Seidman, David C Dunand |
| On-Site Speaker (Planned) |
Richard A. Michi |
| Abstract Scope |
Dilute, nanoprecipitate-strengthened Al-Sc-Zr aluminum alloys that retain their strength for long periods of time at elevated temperatures have been studied for many years. These aluminum “superalloys” are strengthened by coherent, L12-structure Al3(Sc1-xZrx) nanoprecipitates. However, the high cost of Sc in these alloys limits their commercial viability. We have developed Zr-based, Sc-free alloys with similar aging behavior and coarsening resistance to the most advanced Sc-containing alloys developed to date. Nanoprecipitate cores enriched in Er provide a nearly 50% increase in dislocation creep threshold stress relative to similar Sc-containing alloys at 300 °C. This talk will discuss alloy precipitation behavior, temporal evolution of L12 nanoprecipitates as measured by atom-probe tomography, and creep properties at 300–400 °C. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |