|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Partitioning Behavior based Design of BCC / B2 Dual-phase Refractory Multi-principal Element Alloys
||Hosun Jun, Pyuck-Pa Choi, Zhiming Li, Dierk Raabe
|On-Site Speaker (Planned)
Refractory multi-principal element alloys (MPEAs) have received attention for their outstanding high temperature strength. Refractory MPEAs with a BCC matrix and coherent B2 precipitates are expected to have further improved creep resistance at elevated temperature by precipitation hardening effect.
In this research, refractory MPEAs with BCC matrix / B2 precipitate microstructure were designed by a novel approach of mixing two virtual base alloys, namely Ti-25 at.% Nb and HfAl. Their mixing ratio was controlled to form a supersaturated solution after homogenization and induce phase separation during an ageing treatment. Ageing temperature and time were varied for systematical studies of elemental partitioning behavior.
The microstructure of alloys after heat treatment were studied by multiple characterization techniques including X-ray diffraction, transmission electron microscopy (TEM), and atom probe tomography (APT). Results showed that refractory MPEAs with a BCC matrix and coherent B2 nanoprecipitates of 0.5~0.8nm in size could be successfully fabricated.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume