| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Alloys, Processing and Characterization
|
| Presentation Title |
Microstructure and Mechanical Properties of a Precipitation-hardened Al-Mn-Zr-Er Alloy |
| Author(s) |
Amir R. Farkoosh, David N Seidman, David C Dunand |
| On-Site Speaker (Planned) |
Amir R. Farkoosh |
| Abstract Scope |
Commercial aluminum alloys are unusable above ~250 °C (523 K, which is 56% of the absolute melting point of aluminum, Tm = 933 K), due mainly to the rapid coarsening/dissolution of their fine strengthening precipitates. The recently developed L12-strengthened alloys, however, exhibit a significantly better coarsening resistance at high temperatures. In this study, we present a new class of L12-strengthed aluminum alloys based on the Al-Zr-Mn-RE (RE= Rare-Earth elements) system, which exhibits an exceptional combination of high creep and high coarsening resistance in the temperature range 300-400 °C. The microstructure of the alloys in the as-cast and aged conditions has been studied over relevant length scales utilizing scanning electron microscopy (SEM), transmission electron microscopy (TEM), and local-electrode atom-probe (LEAP) tomography in parallel with electrical conductivity and microhardness measurements. Compressive creep experiments are performed to determine the creep threshold stresses of these alloys at 300 and 400 °C. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, High-Temperature Materials, Characterization |