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 |
Analysis of Horizontally Graded Titanium-Tantalum Using Laser Powder Bed Fusion Additive Manufacturing |
Author(s) |
Cherish Lesko, Joseph Walker, John Middendorf, Joy Gockel |
On-Site Speaker (Planned) |
Cherish Lesko |
Abstract Scope |
Fine spatial resolution in complex additively manufactured (AM) objects requires the use of laser powder bed fusion (LPBF). New LPBF technology allows the fabrication of multi-directional compositional gradients into a single build. A sample with compositional grades perpendicular to the build direction was produced. Compositional regions ranging from 100% titanium to 100% tantalum were built with different process parameters for each region. Scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction were used to observe both the bulk and interface regions. SEM images demonstrate that cellular morphology is present because of non-equilibrium solidification and elemental segregation. EDS line and area scans indicate diffusional segregation of tantalum away from the interface regions and localized differences in cooling rates. The ability to include compositional gradients in three dimensions along with the fine spatial resolution of LPBF will lead to the capability to design and fabricate complex geometries with tailored properties. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |