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: Extruded aluminum alloy which excels in machinability, caulking properties, and wear resistance, the extruded aluminum alloy including 3.0 to 6.0 mass % of Si, 0.1 to 0.45 mass % of Mg, 0.01 to 0.5 mass % of Cu, 0.01 to 0.5 mass % of Mn, and 0.40 to 0.90 mass % of Fe, with the balance being Al and unavoidable impurities.

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: A wear-resistant aluminum alloy improved in wear resistance (or viscosity), including: 0.1 to 0.39 wt % of Mg, 3.0 to 6.0 wt % of Si, 0.01 to 0.5 wt % of Cu, 0.01 to 0.5 wt % of Fe, 0.01 to 0.5 wt % of Mn, 0.01 to 0.5 wt % of Cr, and the remainder being Al and unavoidable impurities; and an extruded product using the aluminum alloy.

Abstract: A suspension arm made of an aluminum alloy extruded profile having a portion forming a bottom portion, portions forming at least two vertical walls, and a horizontal rib which connects the two vertical walls, wherein a suspension part lower end support portion is formed between the two vertical walls or at the bottom portion by removing a part of the horizontal rib. It is preferable to gradually change the interval between the two vertical walls in the portion in which the horizontal rib is removed.

Abstract: Extruded aluminum alloy which excels in machinability, caulking properties, and wear resistance, the extruded aluminum alloy including 3.0 to 6.0 mass % of Si, 0.1 to 0.45 mass % of Mg, 0.01 to 0.5 mass % of Cu, 0.01 to 0.5 mass % of Mn, and 0.40 to 0.90 mass % of Fe, with the balance being Al and unavoidable impurities.