Aisin Keikinzoku Co., Ltd.

Sumitomo Chemical Company, Limited

Aisin Aw Co., Ltd.

Tomoo Yoshida

Karin Shibata

Hiroshi Tabuchi

Arata Yoshida

Satoshi Nishikawa

Shinji Makino

Shinichi Asai

Michihiro Toyoda

Hidetoshi Takagi

A method for producing an aluminum alloy extruded material includes: subjecting, to extrusion processing, a casted billet obtained from an aluminum alloy containing 6.0 to 8.0% by mass of Zn, 1.50 to 3.50% by mass of Mg, 0.20 to 1.50% by mass of Cu, 0.10 to 0.25% by mass of Zr, 0.005 to 0.05% by mass of Ti, 0.3% by mass or less of Mn, 0.25% by mass or less of Sr, contents of Mn, Zr and Sr being 0.10 to 0.50% by mass, with the balance being Al and inevitable impurities to obtain an extruded material; cooling the extruded material, immediately after the extrusion processing, to 100&#xb0; C. or less at a cooling rate of 50 to 750&#xb0; C./min; then subjecting the extruded material to a heat treatment at 110 to 270&#xb0; C. and subjecting the extruded material to plastic working within a prescribed time after the heat treatment.

Method for producing aluminum alloy extruded material

A method for casting an aluminum alloy includes: pouring molten metal of an aluminum alloy comprising 6.0 to 9.0 mass % of Si, 0.4 to 0.8 mass % of Mg, 0.25 to 1.0 mass % of Cu, 0.08 to 0.25 mass % of Fe, 0.6 mass % or less of Mn, 0.2 mass % or less of Ti, and 0.01 mass % or less of Sr, with the balance being Al and unavoidable impurities into a shot sleeve of a die casting machine; filling a mold cavity of a center-gate die with the molten metal at a gate speed of 1 msec or less so as to produce a laminar flow, and subjecting T5 heat treatment so as to obtain the aluminum alloy having a tensile strength of 240 MPa or more.

Aluminum alloy and die casting method

Intended is to provide an aluminum alloy for die casting having a high strength as well as capable of achieving excellent elongation properties and a functional component using the aluminum alloy. The aluminum alloy comprises, by mass, 6 to 9% of Si, 0.30 to 0.60% of Mg, 0.30 to 0.60% of Cu, 0.25% or less of Fe, 0.60% or less of Mn, 0.2% or less of Ti, 200 ppm or less of Sr, and 5 ppm or less of P, with the balance being Al and inevitable impurities, and wherein Sr(ppm)&#x2212;4.2&#xd7;P(ppm)&#x2265;50.

Aluminum alloy for die casting and functional component using the same

An aluminum alloy extruded material that exhibits high strength by air cooling immediately after extrusion processing and excellent stress corrosion cracking resistance, and a method for manufacturing the same are disclosed. The material includes, by mass: 6.0 to 8.0% of Zn, 1.50 to 2.70% of Mg, 0.20 to 1.50% of Cu, 0.005 to 0.05% of Ti, 0.10 to 0.25% of Zr, 0.3% or less of Mn, 0.05% or less of Cr, 0.25% or less of Sr, and 0.10 to 0.50% in total among Zr, Mn, Cr and Sr, with the balance being Al and unavoidable impurities.

High strength aluminum alloy extruded material with excellent corrosion resistance and favorable quenching properties and manufacturing method therefor

A method for manufacturing a bent article using an aluminum alloy with high strength and excellent corrosion resistance comprises: extruding a cast billet of an aluminum alloy including, by mass, 6.0 to 8.0% Zn, 1.50 to 3.50% Mg, 0.20 to 1.50% Cu, 0.10 to 0.25% Zr, 0.005 to 0.05% Ti, 0.3% or less Mn, 0.25% or less Sr, and the balance Al with inevitable impurities to obtain an extruded material; cooling the extruded material at an average rate of 500&#xb0; C./min or less immediately after the extrusion processing; subjecting the cooled extruded material to preliminary heating treatment at a temperature within a range of 140 to 260&#xb0; C. for 30 to 120 seconds within a predetermined time after the extrusion processing; bending the extruded material having undergone the preliminary heating treatment to obtain a bent article; and subjecting the bent article to artificial aging treatment.

Method for manufacturing bent article using aluminum alloy

A high-strength aluminum alloy exhibiting excellent stress corrosion cracking resistance and excellent extrudability, and a method for producing an extruded shape using the same are disclosed. The aluminum alloy includes 1.6 to 2.6 mass % of Mg, 6.0 to 7.0 mass % of Zn, 0.5 mass % or less of Cu, and 0.01 to 0.05 mass % of Ti, with the balance being Al and unavoidable impurities.

Aluminum alloy and method of manufacturing extrusion using same

A method includes: preparing a molten aluminum alloy consisting of 0.3-0.8 mass % Mg, 0.5-1.2 mass % Si, 0.3 mass % or more excess Si relative to the MgSi stoichiometric composition, 0.05-0.4 mass % Cu, 0.2-0.4 mass % Mn, 0.1-0.3 mass % Cr, 0.2 mass % or less Fe, 0.2 mass % or less Zr, and 0.005-0.1 mass % Ti, with the balance being aluminum and unavoidable impurities; casting the alloy into a billet at a speed of 80 mm/min or more and a cooling rate of 15&#xb0; C./sec or more; extruding the billet into an extruded product; water cooling the product immediately after extrusion at 500&#xb0; C./min or more; and artificially aging the product, thereby yielding an extruded product with fatigue strength of 140 MPa or more, fatigue ratio of 0.45 or more, an interval between striations on a fatigue fracture surface of 5.0 &#x3bc;m or less, and a maximum length of Al&#x2014;Fe&#x2014;Si crystallized products of 10 &#x3bc;m or less.

Al-Mg-Si aluminum alloy extruded product exhibiting excellent fatigue strength and impact fracture resistance

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.

High-strength aluminum alloy extruded product with excellent impact absorption and stress corrosion cracking resistance and method of manufacturing the same

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Toyama, Japan

Tomoo Yoshida