About this Abstract |
| Meeting |
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
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| Symposium
|
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
|
| Presentation Title |
Alloy Design for Improved Precipitation Hardening in Additively Manufactured Al-Alloys |
| Author(s) |
Bharat Mehta, Adam T. Hope, Clay A. Houser |
| On-Site Speaker (Planned) |
Clay A. Houser |
| Abstract Scope |
The powder bed fusion-laser beam (PBF-LB) process generates higher thermal gradients and solidification rates compared to conventional casting, leading to greater solute supersaturation and finer microstructures in Al-alloys, particularly for transition series elements. This enhanced supersaturation can be analyzed using the Scheil solidification model with solute trapping in Thermo-Calc software. This study examines the benefits of increased Zr supersaturation as an alloying element by comparing cast and additively manufactured (AM) samples, where AM samples exhibited a threefold increase in Zr solubility. This higher solubility enhances precipitation hardening, doubling the strengthening effect due to fine L1₂ Al₃Zr nanoprecipitates. The precipitation kinetics and resulting strengthening were accurately modeled using TC-PRISMA and validated against experimental results from Al-Mg-Zr and Al-Mn-Cr-Zr systems. These findings underscore the significance of rapid solidification in designing novel, precipitation-hardened Al-alloys. |
| Proceedings Inclusion? |
Undecided |