New MoWHfZrTi Refractory High Entropy Alloy System: A Microstructural Verification of Phase Formation Criteria Approach

The evaluation of different prediction models concerning phase formation criteria in high entropy alloys is attempted in this work. The correlation between the theoretical data and the preliminary microstructural features of MoWHfZrTi system was used as an example to further analyse the received microstructural characteristics. Based on the obtained findings, the micro segregation in the examined system was explained in terms of atomic size difference, enthalpy values, melting temperature variations and possible effects of electronegativity as derived from the prediction models. A qualitative consideration, underlying the received microstructure based on the aforementioned evidence is formulated.