| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Fracture in Metals: Insights from Experiments and Modeling Across Length and Time Scales
|
| Presentation Title |
Thermally Activated Dislocation Motion and the Brittle-to-Ductile Transition Temperature |
| Author(s) |
Hunter Brumblay, Gregory Thompson, Christopher R. Weinberger |
| On-Site Speaker (Planned) |
Christopher R. Weinberger |
| Abstract Scope |
Certain refractory BCC metals like tungsten and molybdenum can be difficult to process due to their brittle nature at room temperature. As a result, they require significantly more thermomechanical processing than other BCC metals like tantalum and niobium. The origins of this difference in behavior are likely to originate from either the intrinsic differences in dislocation mobility or the effects of impurities on the intrinsic fracture toughness for a given material. In this talk, we examine the role of thermally activated dislocations in determining the BDTT in the BCC transition metals using a model of a crack coupled to discrete dislocation dynamics. Our results provide insight into how dislocation mobility, material processing, and intrinsic fracture toughness are all linked to result in the BDTT and may aid in refractory alloy design. |