Patent ID: 10344359

Abstract:
Provided is an aluminum alloy clad sheet that resolves the contradiction between a high strength level and ductility in a single sheet of the existing 7000-series aluminum alloy or the like, and has high strength, good formability (high ductility), and a good BH property through short-time artificial age hardening. An aluminum alloy clad sheet subjected to diffusion heat treatment includes a plurality of aluminum alloy layers being laminated. In the clad sheet, aluminum alloy layers having specific compositions are adjacently laminated such that the contents of Mg or Zn are different from each other, and a microstructure after the diffusion heat treatment has fine grain size and an interdiffusion region of Mg and Zn. In addition, the clad sheet has a specific DSC characteristic. Consequently, high strength and good formability (high ductility) are exhibited, and a BH property through short-time artificial age hardening is improved.