|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Phase Stability and Microstructural Evolution in Refractory High Entropy Superalloy
||Sangjun Kim, Hyunseok Oh, Kook Noh Yoon, Eun Soo Park
|On-Site Speaker (Planned)
Recently, various refractory high entropy superalloys reported, which have unique microstructure containing cuboidal nano-precipitates in BCC high entropy alloy (HEA). They exhibited superior mechanical properties at both ambient and high temperature. However, there are many unsolved issues to attract even greater attention such as precipitation control of unwanted compounds, optimal phase selection between ordered and disordered BCC, and optimization of mechanical properties etc. In the present study, we propose how to tailor the microstructure of refractory high entropy superalloy in Ti-Zr-Hf-Nb-Ta-Al HEAs. Microstructural evolution for the non-equiatomic HEA compositions and the effects of minor alloying elements were systematically investigated by considering phase transformation mechanism as well as phase equilibria. This result could provide an effective guideline for tailoring microstructure of refractory HEAs with ordered and disordered BCC phases, and developing a promising high entropy superalloy with customized microstructure for ultra-high temperature structural application.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume