|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Microstructural Evolution of Refractory Metal Additions to the CrFeCoNi High Entropy Alloys
||Katerina A. Christofidou, James Miller, Ed Pickering, Howard Stone, Nick Jones
|On-Site Speaker (Planned)
||Katerina A. Christofidou
Transition metal high entropy alloys have been the subject of multiple studies due to their potential suitability for structural applications. In particular, the CrFeCoNi alloy has been shown to be single phase at all temperatures, and hence is an appropriate alloy for further development. However, as alloying with other transition elements has only resulted in limited strengthening benefits, it is necessary to consider alternative strategies. Herein, the additions of Nb and Mo are considered due to their potency as solid solution strengthening elements. Alloys containing additions and co-additions of Nb and Mo of up to 10 at.% were cast, homogenised and aged for 1000 hours at temperatures between 500–900˚C. The resulting microstructures were characterised using microscopy and diffraction methods and the hardness of the alloys was examined to determine the efficacy of the alloying strategy. These observations have been further explored using thermodynamic modeling.