About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Mechanical Response of Materials Investigated through Novel In-situ Experiments and Modeling
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Presentation Title |
Fracture Across Length Scales in Tungsten: A Combined Experimental and Predictive Approach |
Author(s) |
Kevin Schmalbach, Rajaprakash Ramachandramoorthy, Manish Jain, Siddharta Pathak, Johann Michler, William Gerberich, Nathan Mara |
On-Site Speaker (Planned) |
Kevin Schmalbach |
Abstract Scope |
Recent analytical models predict fracture behavior at the macroscale using physically-meaningful parameters from relatively simple uniaxial tension or compression tests. Here, we investigate application of these predictive capabilities to the micro/nanoscale in single crystal tungsten. In situ SEM micropillar compression and ex situ nanoindentation strain rate jump tests reveal deformation behavior over a range of temperatures (room to 400 °C) and strain rates (10-3 to 103 s-1); in situ SEM fracture experiments elucidate fracture behavior at similar conditions. Room temperature micropillar compression testing over these strain rates indicates a possible change in deformation mechanism at ~1 s-1, which is further studied through post-testing TEM. The links between plastic deformation and fracture will be discussed in terms of deformation mechanisms, degree of dislocation shielding ahead of the crack tip, and the brittle to ductile transition. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |