Abstract
Additively manufactured (AM) eutectic Al alloy systems have been studied extensively for advantageous thermal stability and mechanical properties due to their refined microstructures. Al-Cu-Ce alloys are one subset of these AM eutectic alloys. Here we studied phase stability in AM Al-Cu-Ce alloys and compared it to that of conventionally cast ones. A new phase, Al8Cu3Ce, was identified in the microstructures of both AM and cast Al-Cu-Ce alloys. This Al8Cu3Ce phase was not previously included on experimental or thermodynamically calculated phase diagrams of the Al-Cu-Ce system. Therefore, we performed additional thermodynamic modeling of the system. These models were experimentally validated with cast and subsequently heat-treated Al-Cu-Ce alloys. We found that despite the refined microstructure of the AM alloys, the phases formed were consistent with the cast alloys, suggesting that AM processing did not significantly alter the formation and stability of phases from that in the conventional alloys. This work has resolved inconsistent previous descriptions of the Al-Cu-Ce ternary phase diagram in the Al-rich region and resulted in the addition of the Al8Cu3Ce as an equilibrium phase above 500 ℃.
Original language | English |
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Article number | 166984 |
Journal | Journal of Alloys and Compounds |
Volume | 926 |
DOIs | |
State | Published - Dec 10 2022 |
Funding
Research was co-sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office and Vehicle Technologies Office, Propulsion Materials Program. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02–06CH11357. We acknowledge Larry Allard for his help obtaining the TEM micrograph in Fig. 7a. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). Research was co-sponsored by the U.S. Department of Energy , Office of Energy Efficiency and Renewable Energy , Advanced Manufacturing Office and Vehicle Technologies Office , Propulsion Materials Program. This manuscript has been authored by UT-Battelle , LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. Use of the Advanced Photon Source at Argonne National Laboratory was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences , under Contract No. DE-AC02–06CH11357 . We acknowledge Larry Allard for his help obtaining the TEM micrograph in Fig. 7 a.
Funders | Funder number |
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DOE Public Access Plan | |
United States Government | |
U.S. Department of Energy | |
Advanced Manufacturing Office | DE-AC05-00OR22725 |
Office of Science | |
Office of Energy Efficiency and Renewable Energy | |
Basic Energy Sciences | DE-AC02–06CH11357 |
Keywords
- Additive manufacturing
- Intermetallics
- Metals and alloys
- Microstructure
- Phase diagrams
- Thermodynamic modelling