About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing of Metals: Applications of Solidification Fundamentals
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Presentation Title |
In-situ/Ex-situ Visualization of Microstructure Evolution in Aluminum Alloys under Additive Manufacturing Conditions |
Author(s) |
Oliver William Hesmondhalgh, Alec Saville, Brian Rodgers, Adriana Eres Castellanos, Joseph T McKeown, Kester Clarke, Alain Karma, Amy J Clarke |
On-Site Speaker (Planned) |
Oliver William Hesmondhalgh |
Abstract Scope |
Additive manufacturing (AM) is highly customizable and can be used for the production of complex structures. But, 3D printed metals often contain microstructural features like coarse columnar grains that may result in anisotropic properties or metastable phases. Rapid solidification has been found to produce characteristic microstructures and metastable phases in aluminum-germanium (Al-Ge) alloys. With recent experimental advances in advanced and in-situ characterization, the visualization of solidification dynamics in metals and alloys at unprecedented length- and timescales is now possible. This work presents the in-situ characterization of microstructural evolution in Al-Ge alloys by dynamic transmission electron microscopy (DTEM). Complementary ex-situ characterization was also performed. The formation of metastable phases in Al-Ge alloys is found to be highly dependent upon the solidification conditions and local solutal conditions in the melt pool. These results provide new insights into phase stability and microstructure development with processing variations during additive manufacturing. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Aluminum, Solidification |