About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Additive Manufacturing: Materials Design and Alloy Development V – Design Fundamentals
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Presentation Title |
Using θ' Interfaces as Templates for Planar L12 Precipitation in Additively Manufactured AlCuMnZr Alloys |
Author(s) |
Jonathan Poplawsky, Richard Michi, Lawrence Allard, Sumit Bahl, Dongwon Shin, Alex Plotkowski, Amit Shyam |
On-Site Speaker (Planned) |
Jonathan Poplawsky |
Abstract Scope |
Mn and Zr microsolute additions stabilize metastable θ' precipitates (Al2Cu) for lengthy 350C exposures. Ultimately, Mn provides enough θ' stability to allow for slower diffusing Zr to segregate to θ' interfaces and form θ'/L12 (Al3Zr) co-precipitates. Rapid cooling during additive manufacturing allows for 10x’s more matrix Zr than cast-Al, which increases the Zr segregation rate and faster L12 precipitation on θ'. It was also found that planar L12 precipitates remain after the metastable θ' dissolves, as confirmed by atom probe tomography and scanning transmission electron microscopy experiments. This work introduces an alloy design strategy that uses metastable precipitates to quickly nucleate and grow co-precipitates with a desired geometry. These ideas can be applied to engineer new alloys that take advantage of supersaturated matrix solute contents enabled by rapid cooling during additive manufacturing. Microscopy was conducted at ORNL’s CNMS, which is a U.S. DOE Office of Science user facility. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Aluminum, High-Temperature Materials |