About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Materials
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Presentation Title |
Operando Diffraction of Phase Evolution in Selective Laser Melting of Elemental Blends of Al-Sc and Al-Sc-Zr |
Author(s) |
Jennifer A. Glerum, Samy Hocine, Steven van Petegem, Cynthia Sin Ting Chang, Christoph Kenel, Helena Van Swygenhoven, David C. Dunand |
On-Site Speaker (Planned) |
Jennifer A. Glerum |
Abstract Scope |
New alloys must be designed specifically for additive manufacturing via selective laser melting (SLM) due to the rapid cooling rates (~106 K/s) and phase transformations out of equilibrium. High throughput alloy design and testing is more easily achieved by using elemental blend powder stock instead of costly, time-consuming prealloyed powders. Operando high-speed synchrotron diffraction allows for the study of phase evolution during the dissolution, reaction, and precipitation of strengthening phases at short time scales down to 50 µs. Operando and pre-/post-laser scanning diffraction was performed on a custom-built mini-SLM machine at the MS and microXAS beamlines of the Swiss Light Source to study direct Al-Sc-Zr alloy formation from blended elemental Al, Sc, and Zr powders as a function of laser parameters and sample size. The sample microstructure was imaged after laser scanning to characterize the sample porosity and the size and distribution of primary Al3(Sc,Zr) L12 precipitates. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |