| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
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Atomistic Simulations Linked to Experiments to Understand Mechanical Behavior: A MPMD Symposium in Honor of Professor Diana Farkas
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| Presentation Title |
Insights into the Soft Brittle-to-Ductile Transition in BCC Metals Using Multiscale Modeling |
| Author(s) |
Hunter Brumblay, Gregory Thompson, Christopher R. Weinberger |
| On-Site Speaker (Planned) |
Christopher R. Weinberger |
| Abstract Scope |
Processing of refractory BCC metals like tungsten and molybdenum can be difficult due to their brittle nature at room temperature and thus require thermomechanical processing while others like tantalum are substantially more ductile. The origins of this discrepancy has not been fully understood but is likely influenced by both impurities and/or intrinsic dislocation mobility. In this talk, we examine the role thermally activated dislocations play in determining the brittle to ductile transition temperature (BDTT) in the BCC refractory metals. Specifically, we use a discrete dislocation dynamics model understand the relationship between the BDTT and dislocation mobility. These results are combined with DFT predictions of intrinsic fracture resistance to understand how dislocation mobility and fracture resistance conspire to give rise to the BDTT. These results are then compared with experimental observations of the BDTT to see if these models can rationalize the BDT in BCC metals. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, High-Temperature Materials, Modeling and Simulation |