About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Refractory High Entropy Alloys and Ceramics
|
| Presentation Title |
Elastic and plastic behavior of refractory multi-principal-element alloys |
| Author(s) |
Rui Feng, George Kim, Dunji Yu, Yan Chen, Yongjie Hu, Wei Chen, Ke An, Peter Liaw |
| On-Site Speaker (Planned) |
Peter Liaw |
| Abstract Scope |
Refractory high-entropy alloys (HEAs) or multi-principal-element alloys (MPEAs) have garnered considerable attention for their potential in extreme environmental applications. However, their brittleness at room temperature (RT) presents a significant barrier to practical use. Here, we investigate the elastic and plastic behavior of equiatomic ternary NbTiV and MoNbV refractory MPEAs, which are essential subsystems of various model refractory MPEAs, by incorporating Ti and Mo into the binary NbV alloy. The elastic properties of these alloys are examined using in-situ neutron diffraction and first-principles calculations, highlighting the influence of additions of Ti and Mo on the elasticity. The plastic deformation behavior is understood by TEM characterization and neutron-diffraction profile analysis, showing the effects of elemental addition on dislocation slips and edge/screw characters. This research elucidates the origin of RT brittleness in representative refractory MPEAs, providing valuable insights into designing ductile and strong refractory HEAs through a rational alloy-design strategy. |