| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
High Entropy Materials: Concentrated Solid Solution, Intermetallics, Ceramics, Functional Materials and Beyond
|
| Presentation Title |
Effect of Interstitial Nitrogen on the Phase Stability, Strengthening, Mechanical Behavior in TRIP-assisted High-entropy Alloys |
| Author(s) |
Kenta Yamanaka, Manami Mori, Yusuke Onuki, Shigeo Sato, Akihiko Chiba |
| On-Site Speaker (Planned) |
Kenta Yamanaka |
| Abstract Scope |
High-entropy alloys (HEAs) showing transformation-induced plasticity (TRIP) have a great potential as a novel class of alloys with excellent mechanical properties. However, the yield strength of sole solid solution in such alloys is still low from the viewpoint of industrial applications. Here, we examined the effect of interstitial nitrogen on the mechanical behavior of a TRIP-assisted CoCrFeMnNi-based HEA. The results indicated that adding trace nitrogen (0.08 mass%) remarkably improved the stability of the matrix phase against low-temperature phase decomposition. Furthermore, an enhanced yield strength was achieved via the nitrogen addition with maintaining good ductility. Notably, thanks to the interaction between dislocations and nitrogen atoms, the metastable fcc phase of the N-doped HEA was effectively strengthened by introducing dislocations via hot deformation at the fcc stable temperatures. The TRIP behavior and dislocation dynamics in the studied alloys under tensile loading were examined by in-situ neutron diffraction measurements. |