|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||High Entropy Alloys VI
||Microstructural Evolution and Resulting Mechanical Behavior in Nanocrystalline CoCrCuFeNi High-entropy Alloys after Heat Treatments
||Seungjin Nam, Moon J. Kim, Jun Yeon Hwang, Hyunjoo Choi
|On-Site Speaker (Planned)
High-entropy alloy (HEA) has been widely investigated as novel multicomponent materials with high strength and thermal stability. Moreover, powder metallurgy has been considered to be proper process to produce HEAs with uniform and fine microstructures, allowing atomic-level mixing even at room-temperature. In this study, we have produced nanocrystalline CoCrCuFeNi HEAs via mechanical alloying followed by spark plasma sintering. Although single solid-solution phase with face-centered cubic (FCC) structure was observed after 120 h of milling, the phase was separated into solid-solution phase and Cu-rich phase after sintering and the HEAs showed yield strength of ~1900 MPa. While HEAs, furthermore, revealed high thermal stability until 600 ℃, the microstructure and mechanical behavior was changed after heat treatment at 1000 ℃; grain coarsening led to a decrease of strength and an increase of ductility. The effect of microstructural evolution during heat treatment on the deformation behavior in the HEAs will be discussed.
||Planned: Supplemental Proceedings volume