2026-09-20T17:16:58Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1537902024-03-16T03:24:28Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
Olivetti, Elsa
Ahrens, Jacqueline
Massachusetts Institute of Technology. Department of Materials Science and Engineering
2024-03-15T19:24:14Z
2024-03-15T19:24:14Z
2022-05
2024-02-29T18:51:21.501Z
https://hdl.handle.net/1721.1/153790
https://orcid.org/0000-0001-8244-7575
The design of new aluminum alloys for recycling constitutes a large, multi-dimensional composition space. Within a Bayesian optimization blending model, phase or composition constraints are necessary to narrow the design space within and focus on regions that may contain viable alloys. This thesis focuses on the 6xxx-series system through a broad dataset comprising all known Al-Mg-Si composition and thermodynamic calculations of individual compositions. Explicit matrix phase constraints are not superior to basic Al composition constraints within lean alloys. To suppress detrimental 𝛽-AlFeSi constituent phases and promote strengthening 𝑀𝑔₂𝑆𝑖 intermetallic phases, ratios of Fe/Mn=1 and Mg/Si=1.73 are sufficient. Equilibrium and Scheil calculations of commercial compositions show non-linear regimes where the Fe/Mn=1 rule may be too conservative and point towards ways to expand the amount of Fe that recycled aluminum can accommodate.
S.B.
Massachusetts Institute of Technology
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http://rightsstatements.org/page/InC-EDU/1.0/
Informing Data-Driven Recyclable Aluminum Design with Phase Constraints
Thesis
application/pdf
Bachelor
Bachelor of Science in Materials Science and Engineering
Publication
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unknown
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<Abstract>The design of new aluminum alloys for recycling constitutes a large, multi-dimensional composition space. Within a Bayesian optimization blending model, phase or composition constraints are necessary to narrow the design space within and focus on regions that may contain viable alloys. This thesis focuses on the 6xxx-series system through a broad dataset comprising all known Al-Mg-Si composition and thermodynamic calculations of individual compositions. Explicit matrix phase constraints are not superior to basic Al composition constraints within lean alloys. To suppress detrimental 𝛽-AlFeSi constituent phases and promote strengthening 𝑀𝑔₂𝑆𝑖 intermetallic phases, ratios of Fe/Mn=1 and Mg/Si=1.73 are sufficient. Equilibrium and Scheil calculations of commercial compositions show non-linear regimes where the Fe/Mn=1 rule may be too conservative and point towards ways to expand the amount of Fe that recycled aluminum can accommodate.</Abstract>
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