About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
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Presentation Title |
Designing Duplex Microstructures in Additive Manufactured Ti Alloys: An Avenue to Achieve High Strength and Ductility |
Author(s) |
Jenniffer Bustillos, Atieh Moridi |
On-Site Speaker (Planned) |
Jenniffer Bustillos |
Abstract Scope |
Limited plasticity in additive manufactured (AM) Ti alloys is a long-standing challenge hindering the widespread adoption of the technology. Through a single hot isostatic pressing (HIP) treatment and deliberate introduction of “lack of fusion” defects, we demonstrate the ability to engineer a duplex microstructure with excellent combinations of strength (UTS=1.06±0.02GPa) and ductility (εf=18±0.06%). Interrupted tensile tests with concurrent microstructural analysis using electron backscatter diffraction, electron channeling contrast imaging, and digital image correlation are performed to capture the heterogenous distribution of strains in the duplex microstructure. Restrained dislocation interactions within α-laths and unhindered dislocation activity in globular α-grains are proposed as the key mechanisms enabling enhanced plasticity with moderate strengthening via work-hardening. Fundamental understanding of co-deformation interactions will pave the way to engineer damage-tolerant AM Ti structures with tunable mechanical properties by engineering the volume fraction of lamellar and globular grains. |
Proceedings Inclusion? |
Planned: |