Thermo-mechanical and phase prediction of Ni25Al25Co14Fe14Ti9Mn8Cr5 high entropy alloys system using THERMO-CALC

Abstract

This study focuses on predicting phases and thermo-mechanical properties of NiAl-Ti-Mn-Co-Fe-Cr High Entropy Alloys (HEAs) using THERMOCALC software version 2021b with the TCHEA5 HEAs database. The thermodynamic simulation was used to investigate the phase formation and total hardness of the HEAs. The thermodynamic simulation result shows the presence of three major phases at room temperature, namely, BCC, SIGMA, and HEUSLER phases, with the BCC having a higher percentage of volume fraction of 62.4%. The activity of all components at high temperatures was studied, and the study shows Ni and Al to be stable at high temperatures, implying excellent mechanical properties are expected at high temperatures. The predicted total hardness is given as 96.2 HV.