| 摘要 |
PROBLEM TO BE SOLVED: To provide a 7000-series aluminum alloy sheet for constructional material having intensity, molding ability and anticorrosion.SOLUTION: A Zn amount in a 7000-series aluminum alloy sheet having a specific composition and formed by a conventional method, is suppressed, and high intensity is maintained by balance with an Mg amount. An average composition ratio of Zn and Mg of grain boundary precipitate when the formed sheet is subjected to room temperature aging, and an average composition ratio of Zn and Mg of in-grain precipitate of the sheet after the sheet is subjected to artificial aging curing treatment, are controlled, for achieving high intensity, molding ability, and anticorrosion which are required for a constructional material. |
