Microstructure Evolution and Mechanical Properties of Inconel 625 Foils

The microstructure evolution and mechanical properties of cold-rolled Inconel 625 foil with thickness of 50 μm were investigated. After annealing at 650 and 700 °C, the cold-rolled microstructure transformed into smaller recrystallization grain and annealing twins, while the fraction and particle size of MC carbides increased with increasing aging temperature and duration. TEM analysis confirms the precipitation of irregular lens and near spherical-shaped γ^'' phase at 700 °C, which is not observed in the sample annealed at 650 °C. The foil after annealing at 650 °C for 48 h exhibits the best mechanical properties with ultimate tensile strength and yield strength of 1515 and 1077 MPa as well as reasonable elongation of 19.5