| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Characterization and Simulation of Eta and Eta-prime Precipitates Evolution in Laser Heat Treated Cold Spray of AA7050 |
| Author(s) |
Ning Zhu, Luke N Brewer |
| On-Site Speaker (Planned) |
Ning Zhu |
| Abstract Scope |
This presentation describes the evolution of eta and eta-prime precipitates during laser heat treatment of aluminum alloy AA7050. The size and distribution of metastable eta-prime precipitates dominate the mechanical property of AA7xxx alloys. Wrought plates and cold sprayed AA7050 material were subjected to systematic laser heat treatments. These thermal profiles were used in combination with ThermoCalc and PRISMA simulations to simulate the evolution of the eta and eta-prime phases. The results predict that eta precipitates are mainly distributed along the grain boundaries, while eta-prime are primarily nucleated within the grain matrix. Transmission electron microscopy is being employed to quantify the precipitate sizes, volume fractions, and spacing in the starting cold spray powders, cold spray deposits, and comparison wrought plates. We observed coarsening of both eta and eta-prime precipitates in the cold spray deposits. The degree of coarsening is a strong function of the linear heat input employed during laser heating. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Aluminum, Characterization |