| About this Abstract |
| Meeting |
2019 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Alloys, Processing and Characterization
|
| Presentation Title |
Microstructure and Mechanical Properties of an Al-Zr-Er High Temperature Alloy Microalloyed with Tungsten |
| Author(s) |
Amir R. Farkoosh, David Dunand, David N. Seidman |
| On-Site Speaker (Planned) |
Amir R. Farkoosh |
| Abstract Scope |
We are studying the possibility of improving the coarsening resistance of nanoprecipitates with the L12 structure, in an Al-Zr-Er alloy system, by microalloying with slow-diffusing transition metals (TMs). Dilute Al-Zr-Er-TM alloys were prepared, cast and isochronally (3 h steps, from 200 to 600 oC) aged to understand the behavior of specific TMs and their interactions with Zr and Er in aluminum. The microstructure of these alloys in the as-cast and aged conditions has been studied over relevant length scales in parallel with electrical conductivity and microhardness measurements. In addition to optical microscopy, scanning electron microscopy and transmission electron microscopy studies, local-electrode atom-probe tomography analyses are performed to investigate the structure of the age-hardening (L12) nanoprecipitates in selected alloys. The effect of TMs on the lattice parameter mismatch (between the nanoprecipitates and the matrix), which has a significant effect on the creep resistance is also studied via first-principles calculations. |
| Proceedings Inclusion? |
Planned: Light Metals |