About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Length-Scale Phenomena in Mechanical Response
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Presentation Title |
The Microstructural Picture of Mechanical Strain-rate Dependence in Additively Manufactured NiTiNb Shape Memory Alloys |
Author(s) |
Rebecca A. Gallivan, Nerea Abando, Nancy Z. Li, Ralph Spolenak |
On-Site Speaker (Planned) |
Rebecca A. Gallivan |
Abstract Scope |
Additively manufactured NiTi with Nb as a sintering aid has been shown to demonstrate shape memory properties, opening opportunities for advanced functional design. However, the microscale mechanical behavior of these alloys remains an open area of exploration, particularly regarding high strain-rate deformation. Through nanoindentation mapping, we investigate the hardness of local microstructures in 3D printed NiTi with varying concentration of Nb over strain rates ranging from 10-3 to 103 s-1. Alloys are produced via filament extrusion 3D printing and undergo a post-printing sintering process to reduce porosity. The microstructural features are characterized through SEM and EDX imaging. By illuminating the relative contributions of specific features like Nb-rich regions and oxide inclusions, we highlight the role of specific microstructural features in localized mechanical response. These findings help provide insight for future microstructural design and reveal the relationship between the additive process and micromechanical response under both quasi-static and high strain-rate deformation. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Mechanical Properties, Other |