About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermodynamics and Kinetics of Alloys III
|
| Presentation Title |
Effect of Sn Microalloying on the Precipitation Kinetics of L12-Al3Zr in a Dilute Aluminum-Zirconium Alloy |
| Author(s) |
Janet M. Meier, Dongwon Shin, Jonathan D Poplawsky, Lawrence F Allard, Sumit Bahl, James Allen Haynes, Amit Shyam |
| On-Site Speaker (Planned) |
Janet M. Meier |
| Abstract Scope |
Despite extensive study, the effect of non-trialuminide-forming microalloying elements on nucleation of L12-Al3Zr precipitates is still not fully understood. In our previous work, we discovered Sn accelerates the precipitation kinetics of L12-Al3Zr and also reported the nucleation of L12-Al3Zr at 200°C after the proposed Low melting-point Element Assisted Nucleation (LEAN) mechanism. In this work, the improved age-hardening response observed in a dilute Al-Zr alloys during isothermal aging at 425°C due to Si and Sn microalloying is explored. Atom probe tomography and scanning transmission electron microscopy will be used to identify the mechanisms that improve the L12-Al3Zr precipitation kinetics due to Si and Sn additions. The two-stage aging behavior of the Al-Zr-Sn alloy was also investigated to identify the age-hardening contribution provided by the LEAN mechanism. These experimental results will be evaluated in light of classical nucleation theory and the existing understanding of Zr diffusion in Al. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Characterization, Phase Transformations |