|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Investigating the Mechanical Response of Refractory High-entropy Alloys Using Ion Irradiation and Micromechanical Testing
||Bo-Shiuan Li, Anna Kareer, Angus Wilkinson, Amy Gandy, Alexander Carruthers, Ed Pickering, David Armstrong
|On-Site Speaker (Planned)
Refractory high-entropy alloys (RHEAs) are an alternative type of HEAs that possess BCC matrix and superior high-temperature strength compared to their FCC predecessors, making them ideal structural materials for extreme nuclear environment. As part of the UK-India collaboration on developing nuclear-friendly HEAs, three quaternary TiV(Nb, Zr, Cr)Ta equiatomic RHEAs were manufactured via arc melting. Micromechanical tests of three as-cast RHEAs showed no hardening after irradiation. The samples were then homogenised at 1400 °C for 100 hrs to ensure thermal stability of microstructure. Large fraction of the brittle C15 Laves phase Ta(V, Cr)2, were found in the TiCVrTa, due to the slow cooling rate during homogenisation. To ensure excellent strength and ductility at reactor condition, future heat treatment will focus on reducing the fraction of the Laves phase. High-temperature micromechanical tests in conjunction with high-resolution microscopy will be used to shed light on the microstructural origin of the irradiation resistance.