Dissolution kinetics of irregular second phase in as-cast Cu-Ti alloys via a multi-particle dissolution model

•A multi-particle dissolution model has been constructed to study the dissolution of the irregular Cu4Ti phase in the as-cast Cu-3.1Ti alloys.•Based on the mass balance and the energy conservation , the multi-particle dissolution model with the spherical log-normal distribution was developed by integrating the CALPHAD-based diffusion theory and high-throughput calculations.•The predicted volumetric and energetic evolution of the irregular Cu4Ti phase under various heating rates was confirmed to agree with the experimental result.•The multi-particle dissolution model could predict the self-coarsening phenomenon of the second phase during dissolution.•The activation energy under different transformed volume fractions was tracked via the Kissinger–Akahira–Sunose (KAS) method.