Phase formation criteria assessment on the microstructure of a new refractory high entropy alloy

This work focuses on the evaluation of various parametric models for the formation of solid solution phases in high entropy alloys. The actual observation of MoWHfZrTi microstructure, along with the theoretical suggestions for single phase selection is discussed. The micro-segregated obtained structure is explained in terms of introducing a possible mechanism based on the estimation of thermodynamic parameters and further analysis of the experimental evidence upon solidification. High values of both micro and macro hardness characterize the synthesized system, indicating a solid solution strengthening mechanism. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.