Abstract: A method for brazing aluminum alloy-assembled articles with a filler alloy having a liquidus temperature of 540° C. or lower and a difference of temperature between the liquidus temperature and the solidus temperature being 100° C. or lower, wherein the highest temperature reached in the assembled article at the time of heating for brazing being set 40° C. or more higher than the liquidus temperature but 585° C. or lower. An aluminum alloy-filler alloy usable at low temperature for brazing, which comprises Si in an amount of 4.0 wt % to 8.0 wt %, Zn in an amount of 7.0 wt % to 20.0 wt % and Cu in an amount of 10.0 wt % to 35.0 wt %, with the balance being made of aluminum.

Abstract: There is disclosed an aluminum alloy extruded material for structural members of automotive bodies, which is composed of an aluminum alloy containing more than 2.6 wt % but 4.0 wt % or less of Si and more than 0.3 wt % but 1.5 wt % or less of Mg, further, (i) containing Mn, Zn, Cu, and Fe each in a given amount, or (ii) containing Zn, Cu, and Fe each in a given amount and containing at least one selected from among Mn, Cr, Zr, and V in a given amount, and the balance being made of Al and unavoidable impurities, which material has a given conductivity and a given melting start temperature. There is also disclosed a method for producing the extruded material, in which after an aluminum alloy ingot of the above composition is subjected to a homogenizing treatment at given conditions, it is cooled, heated again, and subjected to hot extrusion at given conditions.

Abstract: A method for brazing aluminum alloy-assembled articles with a filler alloy having a liquidus temperature of 540° C. or lower and a difference of temperature between the liquidus temperature and the solidus temperature being 100° C. or lower, wherein the highest temperature reached in the assembled article at the time of heating for brazing being set 40° C. or more higher than the liquidus temperature but 585° C. or lower. An aluminum alloy-filler alloy usable at low temperature for brazing, which comprises Si in an amount of 4.0 wt % to 8.0 wt %, Zn in an amount of 7.0 wt % to 20.0 wt % and Cu in an amount of 10.0 wt % to 35.0 wt %, with the balance being made of aluminum.

Abstract: A wear-resistant wrought Al alloy having a desirable high fatigue strength, toughness and flexure strength when subjected to a quenching and an age hardening heat treatment. The Al alloy contains 8.0 to 13.0% by weight of Si, 0.1 to 0.5% by weight of Fe, 1.5 to 5.0% by weight of Cu, 0.4 to 1.5% by weight of Mg, 0.05 to 0.5% by weight of Cr, 0.05 to 0.5% by weight of Ni, an element selected from the group consisting of 0.005 to 0.05% by weight of Sr and 0.05 to 0.3% by weight of Sb, and the remainder being Al and unavoidable impurities, wherein there is no more than 0.04% by weight of Mn as an unavoidable impurity. The Al alloy having Si particles being finely dispersed therein, wherein an average diameter of an equivalent circle of Si particles is not more than 5.00 .mu.m and an average roundness of Si particles is not less than 0.50. The amounts of Fe, Cr and Ni contained in the alloy and the amount of Mn as an impurity are such to prevent Si particles and other intermetallic compounds from enlarging.

Abstract: An aluminum alloy cast molding produced by a high-pressure casting method, and having a composition containing Si in an amount of 0.6 to 1.0% by weight (which will be hereinafter simply referred to as %), Cu in an amount of 0.6 to 1.2%, Mg in an amount of 0.8 to 1.2%, Zn in an amount of 0.4 to 1.2%, Ti in an amount of 0.01 to 0.20%, and B in an amount of 0.002 to 0.015%, with the remainder being aluminum and inevitable impurities. The maximum dendrite cell size of the metal structure of the aluminum alloy casting is limited to 60 .mu.m or less. The present invention also provides a method of manufacturing an aluminum alloy casting by high-pressure casting, which manufacturing method includes the steps of charging a mold with a molten aluminum alloy having the above alloy composition, and subsequently solidifying the charged molten metal under pressures as high as 500 Kgf/cm.sup.2 or above so that the maximum dendrite cell size of the metal structure of the aluminum alloy casting is limited to 60 .mu.