About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Materials Design and Alloy Development IV: Rapid Development
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Presentation Title |
Efficacy of Elemental Mixing for In Situ Alloyed Al-33wt%Cu during Laser Powder Bed Fusion |
Author(s) |
Jonathan M. Skelton, Eli Sullivan , James Fitz-Gerald, Jerrold Floro |
On-Site Speaker (Planned) |
Jonathan M. Skelton |
Abstract Scope |
Alloy development for laser powder bed fusion (LPBF) is hindered by lack of access to custom powder feedstocks. To circumvent this, in situ alloying of elemental powder during LPBF processing is investigated for rapid prototyping of new alloy compositions. The effect that powder size distribution in elemental powder blends has on the compositional homogeneity of built samples is studied with respect to the laser processing parameters. The microstructure of the Al-Cu eutectic system serves here as an indicator of the mixing efficacy during laser melting, where deviations of the solute concentration from the eutectic composition can be observed through hypo- or hypereutectic regions that form. These composition deviations arise when the melt pool size encompasses insufficient particles to be a stochastic representation of the blend, suggesting that liquid phase intermixing limitations are less important than the melt pool volume itself. Support of the NSF under grant DMR-1663085 is gratefully acknowledged. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Aluminum, Powder Materials |