Abstract: A method of producing an aluminum alloy extruded product comprising: casting a billet using a 7000-series aluminum alloy having Mg of 0.95 to 1.95 mass %, Zn of 5.10 to 7.90 mass %, an excess mg or Zn content relative to a stoichiometric composition shown by MgZn2 of less than 0.5 mass %; an A=Zn?5.36×Mg (mass %) of ?2.64 to 0.50; and at least one of Mn, Cr and Zr with a total content thereof being less than 0.25 mass %; homogenizing the billet at 450 to 550° C.; preheating the homogenized product at 480 to 540° C.; extruding the preheated product with a die heated at 440 to 500° C.; and subjecting the extruded product to press quenching at an air cooling rate of 29° C./min or more, wherein a proof stress increase due to natural aging is 15 Mpa or less and a hardness HV increase due to natural aging is seven or less.

Abstract: An aluminum alloy extruded product includes 0.3 to 0.8 mass % of Mg, 0.5 to 1.2 mass % of Si, 0.3 mass % or more of excess Si with respect to the Mg2Si stoichiometric composition, 0.05 to 0.4 mass % of Cu, 0.2 to 0.4 mass % of Mn, 0.1 to 0.3 mass % of Cr, 0.2 mass % or less of Fe, 0.2 mass % or less of Zr, and 0.005 to 0.1 mass % of Ti, with the balance being aluminum and unavoidable impurities, the aluminum alloy extruded product having a fatigue strength of 140 MPa or more, a fatigue ratio of 0.45 or more, and an interval between striations on a fatigue fracture surface of 5.0 ?m or less.

Abstract: An extruded product includes a 7000-series aluminum alloy, the 7000-series aluminum alloy having an excess Mg content or an excess Zn content of less than 0.5 mass % with respect to a stoichiometric composition shown by MgZn2.

Abstract: This invention relates to a 6000-series aluminum extruded material containing magnesium (0.3% to 0.7% by mass), silicon (0.7% to 1.5% by mass), copper (0.35% or less by mass), iron (0.35% or less by mass), titanium (0.005% to 0.1% by mass), manganese (0.05% to 0.30% by mass), chrome (0.10% or less by mass), and zirconium (0.10% or less by mass) (provided that at least one transition element selected from the group consisting of manganese, chromium, and zirconium is contained in a total amount representing 0.05% to 0.40% by mass), with the balance comprising aluminum with inevitable impurities, such aluminium extruded material having a predetermined yield strength of 180 MPa or more with an increase of 60 MPa as a result of a thermal history corresponding to paint baking.

Abstract: An aluminum alloy extruded product includes an aluminum alloy including 6.0 to 7.2 mass % of Zn, 1.0 to 1.6 mass % of Mg, 0.1 to 0.4 mass % of Cu, at least one component selected from the group consisting of Mn, Cr, and Zr in a respective amount of 0.25 mass % or less and a total amount of 0.15 to 0.25 mass %, 0.20 mass % or less of Fe, and 0.10 mass % or less of Si, with the balance substantially being aluminum, the aluminum alloy extruded product having a hollow cross-sectional shape, a recrystallization rate of 20% or less of a cross-sectional area of the extruded product, and a 0.2% proof stress of 370 to 450 MPa.