|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||P20: Nanocrystalline, Two Phase High-entropy Alloy: Strengthening by Grain Boundaris Versus Second-phase Particle
||Jeong-Min Park, Dong-Hyun Lee, Zhaoping Lu, Jin-Yoo Suh, Megumi Kawasaki, Upadrasta Ramamurty, Jae-il Jang
|On-Site Speaker (Planned)
Recent studies reported that the mechanical properties of high-entropy alloys (HEAs) can be further improved by grain refinement or precipitation hardening. Thus, one can expect a synergetic effect on mechanical performance by combining these two strengthening mechanisms. In this study, (CoCrFeNi)94Ti2Al4 HEA with and without L12-Ni3(Ti,Al) second-phase particles was subjected to high-pressure torsion (HPT) to examine the possibility of deriving the benefits of particle and grain boundary strengthening simultaneously. The mechanical behavior and microstructural stability of second-phase strengthened HEA processed by HPT was investigated through a series of experiments using nanoindentation tests and transmission electron microscopy analysis. The obtained results were analyzed in terms of the changes in microstructure, strain rate sensitivity, and activation volume with HPT turns.
* This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Ministry of Science and ICT (No. 2015R1A5A1037627 and No. 2017R1A2B4012255).