| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2023
|
| Presentation Title |
The Influence of Thermally Activated Dislocation Motion on the Brittle-ductile Transition of BCC Refractory Metals |
| Author(s) |
Hunter K. Brumblay, Tariqul Islam, Gregory B. Thompson, Christopher R. Weinberger |
| On-Site Speaker (Planned) |
Hunter K. Brumblay |
| 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. For example, tungsten has a brittle to ductile transition temperature (BDTT) near 500K while tantalum’s is below 70K. The origins of this discrepancy has not been fully elucidated, but could originate from either the intrinsic differences in dislocation mobility or impurities. In this talk, we examine the role thermally activated dislocations play in determining the BDTT in the BCC transition metals using a model of a crack coupled to discrete dislocation dynamics. These results provide insight into how dislocation mobility and intrinsic toughness influence the BDTT, shed light into whether impurities or intrinsic dislocation mobility control the BDTT, and may aid in refractory alloy design. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Mechanical Properties, |