Method for producing 7000-series aluminum alloy member excellent in stress corrosion cracking resistance

A method for producing an aluminum alloy member consisting of a 7000-series aluminum alloy extruded shape excellent in stress corrosion cracking resistance, comprising:

• quenching the aluminum alloy extruded shape;
• subjecting the quenched aluminum alloy extruded shape to natural aging for 12 hours or longer;
• subjecting at least one region of the aluminum alloy extruded shape subjected to the natural aging to a restoring treatment of heating the region at a temperature-raising rate of 0.4° C./second or more, holding the region in a temperature range of 300 to 590° C. for a time longer than zero second and cooling the region at a cooling rate of 0.5° C./second or more;
• applying a plastic working to the region within 72 hours of the end of the restoring treatment;
• subjecting the region to a heat treatment of heating the region at a temperature-raising rate of 0.4° C./second or more, holding the region in a temperature range of 300 to 590° C. for a time longer than zero second and not longer than 300 seconds and cooling the region at a cooling rate of 2000° C./minute or less;
• and
• subjecting the whole of the aluminum alloy extruded shape subjected to the heat treatment to an artificial aging treatment.