| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Tackling Metallic Structural Materials Challenges for Advanced Nuclear Reactors
|
| Presentation Title |
The Effect of Infinitesimal Potassium Doping on Incipient Plasticity and Ductile-to-Brittle Transition Temperature of Tungsten |
| Author(s) |
Jeongseok Kim, Guensik Min, Phu Cuong Nguyen, Sungmin Lee, Yeonju Oh, Hwangsun Kim, Hyoung Chan Kim, Ill Ryu, Heung Nam Han |
| On-Site Speaker (Planned) |
Jeongseok Kim |
| Abstract Scope |
This study quantitatively analyzed the effect of infinitesimal potassium doping on the incipient plasticity of tungsten and revealed its effect on the DBTT of tungsten. TEM analysis revealed the existence of potassium bubbles with an average size of several tens of nanometers inside the K-doped W specimen. Nanoindentation tests showed that the K-doped W specimen initiates plastic deformation at lower stress levels than those required for commercial pure tungsten specimens. Defect dynamics simulations quantified the stress concentrated around the potassium bubbles and elucidated the influence of potassium bubbles and dislocation density on stress concentration. These findings fully explain why the DBTT of tungsten is reduced by potassium bubbles, and they are expected to contribute to the development of tungsten-based alloys with improved brittleness. |