Microstructural design via spinodal-mediated phase transformation pathways in high-entropy alloys (HEAs) using phase-field modelling

Understanding the phase transformation pathways (PTPs) and microstructural evolution in multi-phase HEAs will aid alloy process designs to tailor microstructures for specific engineering applications. In this work, we study two-phase where a disordered parent separates into mixture of two phases: an ordered ($\beta'$) + ($\beta$) upon cooling following different PTPs: (i) congruent ordering followed by spinodal decomposition then disordering one phases, i.e., $\beta \rightarrow \beta' \beta_1' \beta_2' \beta \beta_2'$ (ii) \beta_1 \beta_2 \beta_1+\beta'$. We systematically investigate effects equilibrium volume fractions individual free energy landscapes (in particular, location critical point miscibility gap relative compositions final phases), elastic modulus mismatch between phases on these HEAs. focus morphological characteristics: bi-continuous vs. precipitates matrix microstructures, precipitates, discreteness precipitate phase. This parametric may HEA design desired microstructures.