About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Bridging Scales: Deformation and Damage Mechanisms in Microstructurally and Compositionally Complex Metallic Alloys
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| Presentation Title |
Simultaneous improvement of strength and ductility in additively manufactured Al-7Si-0.3Mg-0.5Cu-1Fe alloy |
| Author(s) |
Jovid Rakhmonov, Lawrence Allard, Alice Perrin, Sumit Bahl, Charles Hawkins, Allen Haynes, Alex Plotkowski, Amit Shyam |
| On-Site Speaker (Planned) |
Jovid Rakhmonov |
| Abstract Scope |
Fe is a common impurity in Al alloys. High Fe concentration in secondary Al-Si alloys is a ductility-limiting factor, impeding their use for structural automotive applications. Fast solidification intrinsic to additive manufacturing forms highly refined and far-from-equilibrium microstructures. Here, we studied the feasibility of neutralizing the negative effects of Fe by exploiting this rapid solidification capability. Highly refined Fe-rich intermetallic particles significantly improved strength, but ductility was still moderate for alloy in as-fabricated state. Applying heat treatments specifically tailored for such refined microstructures to form shearable nanoprecipitates and/or change morphology of intermetallic particles produced unusually distinct strain-hardening responses. Effective control of strain-hardening behavior of this high-Fe Al-Si alloys, in turn, enabled to achieve significantly high strength-ductility combination. This talk discusses how microstructures of additively manufactured alloys can be engineered to effectively control isotropic and kinematic contributions of strain hardening for improved strength-ductility combination. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Additive Manufacturing, Mechanical Properties |