Phase-field simulation of γʹ coarsening behavior in cobalt-based superalloy

•γʹ evolution in Co-Al-W alloys with various volume fractions is studied by phase-field method.•The coarsening rate of γʹ phase linearly increases with γʹ volume fraction.•The morphology transition and the coarsening mechanism of γʹ are revealed.•The particle size distribution with γʹ high volume fraction accords with MLSW law.•The effects of microstructure features on coarsening behavior are discussed.