An aluminum-magnesium alloy is disclosed which provides superior properties for casting in steel dies and good ductility for forming castings of complex shapes, including thin-wall portions. The aluminum-based alloy contains, in weight percent, about 2-15 percent magnesium, 0.2 to 3 percent silicon, 0.05 to 0.5 percent chromium, 0.05 to 0.5 percent manganese, 0.05 to 0.2% titanium, and a minimal content of iron. In its molten state this aluminum-magnesium-chromium alloy can be pushed into the molding cavities of iron-based dies in a high pressure die casting procedure and conform to complexly-shaped die surfaces with thin cavity portions without dissolving appreciable amounts of iron or experiencing die soldering on the die surfaces. The resulting castings display good strength and ductility and can be further enhanced by an artificial aging process after solution heat treatment.

Aluminum alloys having improved high temperature mechanical properties are provided. An aluminum alloy suitable for sand casting, permanent mold casting, or semi-permanent mold casting includes about 3 to about 12 weight percent silicon; about 0.5 to about 2.0 weight percent copper; about 0.2 to about 0.6 weight percent magnesium; about 0 to about 0.5 weight percent chromium; about 0 to about 0.3 weight percent each of zirconium, vanadium, cobalt, and barium; about 0 to about 0.3 weight percent each of strontium, sodium, and titanium; about 0 to about 0.5 weight percent each of iron manganese, and zinc; and about 0.0.1 weight percent of other trace elements. Also disclosed is a semi permanent mold cast article, such as an engine cylinder head.

The present invention relates to a method for preparing an aluminum-copper-iron quasicrystal and silicon carbide mixed reinforced aluminum matrix composite, where the aluminum-copper-iron quasicrystal and silicon carbide mixed reinforced aluminum matrix composite is prepared with an aluminum alloy serving as a matrix and with aluminum-copper-iron quasicrystal and silicon carbide serving as reinforcement agents via smelting in an intermediate-frequency induction melting furnace through the process of intermediate-frequency induction heating, vacuumizing, bottom blowing argon, and casting molding in view of low hardness and low tensile strength of aluminum matrix materials. The prepared aluminum-copper-iron quasicrystal and silicon carbide mixed reinforced aluminum matrix composite has a hardness of 80.3 HB which is improved by 50.64% and tensile strength of 285 Mpa which is improved by 60.42%, and corrosion resistance thereof is improved by 40%.

An aluminum alloy fin material includes an aluminum alloy containing 1.50 to 5.00 mass % Si with the balance of Al and inevitable impurities, and has the function of being bonded by heating with a single layer. Assuming that in a cross section along the thickness direction of the fin material, the equivalent circle diameter of a Si particle is represented by D, a distance from a surface layer to the center of the Si particle is represented by L, the thickness of the fin material is represented by t, and a length parallel to the surface layer is represented by W, all Si particles that are present in the range of the length W and satisfy DL and L+D>0.04 t also satisfy 0D.sup.2<0.08 tW. An aluminum alloy brazing sheet includes, as a skin material, the fin material that is clad on a core material including an aluminum alloy. A heat exchanger includes the fin material or the brazing sheet that is used in a fin.

A high-strength aluminum alloy for die casting having excellent corrosion resistance and thermal conductivity includes, based on the total weight of the alloy, 5 to 7 wt % of silicon (Si), 0.1 to 1.0 wt % of iron (Fe), 0.1 to 3.0 wt % of magnesium (Mg), 0.1 to 1.0 wt % of nickel (Ni), 0.15 to 0.45 wt % of titanium (Ti), 1.0 to 3.0 wt % of tin (Sn), and the remainder aluminum (Al).

An improved aluminum alloy for casting into a component, such as a vehicle component, is provided. The improved aluminum alloy includes at least 80 wt. % aluminum; 6.0 to 8.0 wt. % silicon; 1.0 to 2.0 wt. % zinc; 0.10 to 0.6 wt. % magnesium; 0.1 to 0.60 wt. % copper; 0.20. to 0.60 wt. % manganese; up to 0.25 wt. % iron; 0.015 wt. % to 0.03 wt. % strontium; and up to 0.15 wt. % titanium, based on the total weight of the improved aluminum alloy. This improved aluminum alloy can be formed by combining recycled aluminum or recycled aluminum alloy with at least one additional element. The cast component formed of the improved aluminum alloy has a yield strength of 120 MPa to 130 MPa and an elongation of 8% to 16%, depending on flow length, when the cast component is in the as-cast (F temper) condition.

An aluminum casting alloy for near net shaped casting of structural or non-structural components containing, in % by mass, Zn: 4.5-7.5%, Mg: 0.7-2.0%, Fe: 0.8-2.0%, Si: <0.3%, Cu: <0.1%, V: ?0.2%, Ti: ?0.2%, B: ?0.04%, balance Al and unavoidable impurities, the sum of the contents of the impurities being?0.1%. Also, a method for the manufacture of a cast part which has a yield strength of 180 to 200 MPa, an ultimate tensile strength of 300 to 320 MPa and an elongation of 11 to 14% and a method for the manufacture of a cast part which has a yield strength of 210 to 400 MPa, an ultimate tensile strength of 340 to 450 MPa and an elongation of 2 to 11% utilizing the described alloy.

A magnesium alloy includes, in weight percent Al: 4.5-6.5; Zn: 0.05-3.0; Ca: 0-1.5; Sn: 0-4.0; Mn: 0.1-0.5; Si: 0-0.5; B+Sr: 0-0.5; less than 0.1 Fe; less than 0.1 Cu; less than 0.01 Ni; and Mg: Balance. A process for thixomolding, and a large dimension magnesium alloy article are also disclosed.

The present disclosure concerns a foundry alloy suitable for casting operations which lack beryllium. The foundry alloy comprises, in weight percent, Mg (between about 1.0 and about 17.0), Fe (between about 0.5 and about 1.8), one of Ca (between about 0.003 and about 6.0) or Sr (between about 0.003 and about 2.5), optionally a grain refiner and the balance being aluminum and unavoidable impurities. The foundry alloy can be used in a process for making a cast aluminum product, for reducing Mg loss and/or dross generation during the casting operation.

An aluminum alloy for high pressure die casting of ultra-large vehicle body structures. The aluminum alloy includes about 4.00 to about 12.00 weight percent silicon (Si); about 0.20 weight percent maximum (Max) copper (Cu); about 0.40 weight percent Max magnesium (Mg); about 0.20 to about 0.60 weight percent iron (Fe); about 1.00 weight percent Max manganese (Mn); about 0.50 weight percent Max zinc (Zn); about 0.02 weight percent Max strontium (Sr); about 0.50 weight percent Max cerium (Ce); about 0.01 weight Max percent boron (B); and a remaining weight percent aluminum (Al). The aluminum alloy provides an as-cast yield strength of greater than 130 Megapascals (MPa), ultimate tensile strength of greater than 260 MPa, and elongation of greater than 6% without the need for heat treatment.