|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Development of Refractory High Entropy Alloys Fabricated by Powder Metallurgy Process
||Byungchul Kang, Junho Lee, Ho Jin Ryu, Soon Hyung Hong
|On-Site Speaker (Planned)
||Soon Hyung Hong
Refractory high entropy alloys (RHEAs), consisted of multi-principal refractory elements, have exhibited improved mechanical strength at elevated temperature compared to that of Ni-based superalloys. The fabrication of RHEAs have been focused mainly on arc-melting process. However, there have been issues of inhomogeneous microstructures and degraded mechanical properties due to a coarsening during melting process.
In this research, RHEAs with WNbTaVMo based compositions have been firstly fabricated by powder metallurgical process including mechanical alloying and spark plasma sintering. The WNbTaVMo based RHEAs resulted in homogeneous microstructure and outstanding room temperature strength of 2612MPa which are attributed to BCC phase with fine grain sizes ranged 5~6㎛. The powder processed RHEAs showed an excellent high temperature strength of 920MPa at 1000°C, higher than that of arc-melted RHEAs with same composition. The powder metallurgy process of RHEAs could be alternative fabrication process to enhance the mechanical properties through obtaining finer homogeneous microstructures.
||Planned: Supplemental Proceedings volume