| 摘要 |
Provided is an Al-Fe based aluminum alloy sheet having sufficiently high strength for application as a large lithium-ion battery container, as well as good moldability and good laser weldability. The aluminum alloy sheet is a cold-rolled material having an elongation of 5% or more and tensile strength of 90 MPa or more, and having: a chemical composition comprising 0.3 to 1.5 mass% Fe, 0.3 to 1.0 mass% Mn, and 0.002 to 0.20 mass% Ti, with an Mn/Fe mass ratio of 0.2 to 1.0, and the remainder comprising Al and inevitable impurities, such inevitable impurities comprising Si, Cu, and Mg in the respective amounts of less than 0.30 mass% Si, less than 0.20 mass% Cu, and less than 0.20 mass% Mg; and a metallographic structure in which the number of second-phase particles with an equivalent circle diameter of 5 µm or more is less than 500/mm2. Alternatively, the aluminum alloy sheet is simply a cold-rolled annealed material having an elongation of 20% or more. To prevent ingot cracks during casting and bead cracks during laser welding, the aluminum alloy sheet may further comprise 0.05 to 0.20 mass% Zr. |
