The article discusses the application of integrated unified phase-field methods in designing high-performance alloys and optimizing manufacturing processes within an integrated computational materials engineering (ICME) framework. By combining macro process data, solidification, precipitation, and recrystallization conditions, phase-field modeling is used to predict precipitation, segregation, and crack tendency of NbC in austenitic stainless steels, optimizing casting parameters and improving product qualification rates. Phase-field modeling also reveals microstructure evolution in Mg–Li-based alloys during spinodal phase separation, helping design Mg–Li–Al alloys with ultrahigh specific strength. Phase-field simulations of dendritic growth incorporate macro-temperature fields and shrinkage defects, allowing adjustment of casting parameters to optimize mechanical properties. Casting is a critical process for mechanical components, but defects like shrinkage, porosity, and cracks often occur due to the complexity of the process. Traditional trial-and-error methods are inefficient, while numerical simulation software like MAGMASOFT and ProCAST have improved macroscopic process optimization. However, material microstructure also affects casting quality, requiring integration of microstructure and macroscopic process simulations. The phase-field method combines thermodynamics and kinetics, describing internal structure evolution during phase transitions, making it ideal for multi-physical field simulations. The article introduces the "integrated unified phase-field method (IUPFM)" to unify thermodynamics, kinetics, scales, material design, and performance. It highlights applications in analyzing Nb-rich precipitate-induced cracks, revealing spinodal decomposition strengthening mechanisms in Mg–Li–Al alloys, and sealing partition plate castings of ZM5-based alloys. The article also discusses optimizing continuous casting processes by controlling secondary cooling zones and simulating microstructure evolution using phase-field models. The goal is to improve alloy and casting design through integrated phase-field simulations within ICME.The article discusses the application of integrated unified phase-field methods in designing high-performance alloys and optimizing manufacturing processes within an integrated computational materials engineering (ICME) framework. By combining macro process data, solidification, precipitation, and recrystallization conditions, phase-field modeling is used to predict precipitation, segregation, and crack tendency of NbC in austenitic stainless steels, optimizing casting parameters and improving product qualification rates. Phase-field modeling also reveals microstructure evolution in Mg–Li-based alloys during spinodal phase separation, helping design Mg–Li–Al alloys with ultrahigh specific strength. Phase-field simulations of dendritic growth incorporate macro-temperature fields and shrinkage defects, allowing adjustment of casting parameters to optimize mechanical properties. Casting is a critical process for mechanical components, but defects like shrinkage, porosity, and cracks often occur due to the complexity of the process. Traditional trial-and-error methods are inefficient, while numerical simulation software like MAGMASOFT and ProCAST have improved macroscopic process optimization. However, material microstructure also affects casting quality, requiring integration of microstructure and macroscopic process simulations. The phase-field method combines thermodynamics and kinetics, describing internal structure evolution during phase transitions, making it ideal for multi-physical field simulations. The article introduces the "integrated unified phase-field method (IUPFM)" to unify thermodynamics, kinetics, scales, material design, and performance. It highlights applications in analyzing Nb-rich precipitate-induced cracks, revealing spinodal decomposition strengthening mechanisms in Mg–Li–Al alloys, and sealing partition plate castings of ZM5-based alloys. The article also discusses optimizing continuous casting processes by controlling secondary cooling zones and simulating microstructure evolution using phase-field models. The goal is to improve alloy and casting design through integrated phase-field simulations within ICME.