|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Development of TiVNbTaW High Entropy Alloy with TRIPLEX Nanostructure
||Sangjun Kim, Jinyeon Kim, Da Hye Song, Jin Kyu Lee, Eun Soo Park
|On-Site Speaker (Planned)
Recently, various refractory high entropy alloys (RHEAs) have reported to exhibit superior mechanical properties especially at high temperatures comparing conventional Ni-based superalloy. However, RHEAs is their industrial application is limited due to the high melting temperature and poor ductility at room temperature etc. In the present study, we try to develop nanostructured RHEAs with novel mechanical properties. Preferentially, TiVNbTaW RHEA powder with single BCC phase was prepared by high-energy ball milling and sintered using spark plasma sintering. Interestingly, the sintered TiVNbTaW RHEA exhibited TRIPLEX nanostructure consisting of (Nb,Ta)-rich BCC, W-rich BCC and TiO FCC phase, which was formed during the sintering process by decomposition of single BCC phase in as-milled powder. Microstructural evolution of TRIPLEX nanostructure was analyzed in terms of metastable thermodynamic equilibrium and segregation of solute in a complex multi-principle system. This result could provide an effective guideline for tailoring the nanostructure of RHEAs fabricated by powder metallurgy.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume