About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale VIII
|
| Presentation Title |
Grain Boundary Mediated Extreme Superplasticity in BCC Tungsten Nanowires |
| Author(s) |
Zifeng Wang, Hai Li, Li Zhong, Ting Zhu |
| On-Site Speaker (Planned) |
Zifeng Wang |
| Abstract Scope |
Dislocation activity serves as an effective mechanism for inducing plastic deformation. However, it often leads to shear-like behavior and culminates in premature fracture, particularly in body-centered cubic (BCC) metals. Here, by combining in situ transmission electron microscopy straining experiments and atomistic simulations, we present an unusual observation of room temperature uniform elongation exceeding 100% in <110> -oriented tungsten nanowires. This remarkable superplastic deformation is attributed to the synergistic interaction between dislocations and low-angle mixed grain boundary (GB), which effectively promotes the delocalization of deformation and postpones the onset of necking failure in W nanowires. Moreover, in addition to the 1/2<111> dislocation, <100> dislocation can be activated and play a pivotal role in facilitating plastic deformation. Our findings offer mechanistic insights into the superplastic deformations of refractory BCC metals at the nanoscale and suggest potential strategies for improving the reliability and performance of metallic nanostructures and nanodevices. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Mechanical Properties, Modeling and Simulation |