| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys II
|
| Presentation Title |
J-9: Activated Sintering of Ni-doped NbMoTaW Guided by a Computed Grain Boundary Diagram |
| Author(s) |
Sashank Shivakumar, Keqi Song, Mingde Qin, Chunyang Wang, Tianjiao Lei, Huolin Xin, Tim Rupert, Jian Luo |
| On-Site Speaker (Planned) |
Sashank Shivakumar |
| Abstract Scope |
We have extended CALPHAD methods to grain boundaries (GBs) and computed a GB lambda diagram to forecast the formation of liquid-like interfacial phases (GB complexion) in Ni-doped NbMoTaW and related activated sintering. We subsequently confirmed the enhanced sintering of NbMoTaW with the addition of a minor amount of Ni within the solid solubility limit, which is attributed to the enhanced mass transport in the liquid-like interfacial phases formed at the sintering temperature. Careful STEM and SEM characterizations further suggested Ni-enriched interfacial phases likely formed at the high sintering temperature, but de-wetted the GBs during the slow furnace cooling, leaving weak Ni segregation at the GBs. Such activated sintering mechanism and GB lambda diagrams, which had been revealed and constructed for simpler binary refractory alloys like W-Ni in prior studies [Luo et al., APL 2005 & 2008], have been successfully extended to high-entropy alloys in this work. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Powder Materials, High-Temperature Materials |