|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||P17: Microstructural Evolution of TRIPLEX Structure in TiVNbTaW High Entropy Alloy Fabricated by Spark Plasma Sintering
||Sangjun Kim, Jinyeon Kim, Da Hye Song, Jin Kyu Lee, Eun Soo Park
|On-Site Speaker (Planned)
Recently, BCC high entropy alloys (HEAs) composed by Group-4 to Group-6 elements were reported to exhibit superior mechanical properties up to high temperature above 1273 K comparing conventional Ni-based superalloy. However, RHEAs is their industrial application is limited due to the high melting point and poor ductility in room temperature. In this study, TiVNbTaW RHEA powder with single BCC phase was prepared by high-energy ball milling and the fabricated powder were sintered using spark plasma sintering. Sintered TiVNbTaW high entropy alloy 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.