A die-cast aluminum alloy and a preparation method and application thereof are disclosed. Based on the total weight of the aluminum alloy, the aluminum alloy includes: 8-11 wt % of Si, 2.5-5 wt % of Cu, 0.5-1.5 wt % of Mg, 0.1-0.3 wt % of Ni, 0.6-1.2 wt % of Fe, 0.1-0.3 wt % of Cr, 0.03-0.05 wt % of Sr, 0-0.3 wt % of Er, 80.25-88.1 wt % of Al, and 0.1 wt % or below of impurities.

Various embodiments provide methods in which a metal matrix composite (MMC) material is incorporated into a metallic structure during a one-step near-net-shape structural forming process. Various embodiments provide in-situ selective reinforcement processes in which the MMC may be pre-placed on a forming tool in locations that correspond to specific regions in the metallic structure. Various embodiment near-net-shape structural forming processes may then be executed and result in various embodiment metallic structural components with selectively-reinforced regions that provide enhanced mechanical properties in key locations.

The present invention relates to a magnesium alloy material and a method for manufacturing the same. The magnesium alloy material comprises, with respect to the total of 100 wt % thereof: Sc of 0.01 to 0.3 wt %; Al of 0.05 to 15.0 wt %; and the balance being Mg and other unavoidable impurities, wherein the magnesium alloy comprises a secondary phase compound comprising Al and Sc in the alloy in which a Volta potential difference between the secondary phase compound and a magnesium base is less than 920 mV.

The invention is directed to the interventionless activation of wellbore devices using dissolving and/or degrading and/or expanding structural materials. Engineered response materials, such as those that dissolve and/or degrade or expand upon exposure to specific environment, can be used to centralize a device in a wellbore.

A mold device is capable of producing a member formed from aluminum, and includes a mold and a molten metal supply part. The mold is capable of forming a cavity into which molten aluminum is charged. The mold has a base part formed from iron and a surface layer part. The surface layer part is provided on the cavity side of the base part and contains 20 weight % or more of chromium. A dichromium trioxide film is formable on a surface of the cavity side of the surface layer part. The molten metal supply part is capable of supplying molten aluminum into the cavity.

A heat-dissipating component, and a method for manufacturing the same, the component provided with a composited portion including a plate-shaped molded body containing silicon carbide, and hole-formation portions formed in a peripheral edge portion of the composited portion; through-holes being formed in the hole formation sections; the hole-formation portions containing inorganic fibers; the molded body and the inorganic fibers being impregnated with an aluminum-containing metal; and the hole-formation portions forming a part of the outer peripheral surface of the heat-dissipating component.

A heat-resistant and soluble magnesium alloy, and a preparation method having an elemental composition at the following atomic percentage: Lu 0.10% to 8.00%, Ce 0.001 to 0.05%, Al 0.10% to 0.60%, Ca 0.001% to 0.50%, Cu 0.01% to 1.00%, Ni 0.01% to 1.00%, impurity elements <0.30%, and the rest is Mg, and formed in magnesium alloys are high temperature phase of Lu.sub.5Mg.sub.24, Mg.sub.2Cu, Mg.sub.2Ni, Mg.sub.12Ce, Al.sub.11Ce.sub.3 and (Mg, Al).sub.2Ca, and Long Period Stacking Ordered (LPSO) phases as MgLuAl and MgCeAl. The magnesium alloy has good mechanical performances at 150 C., and a dissolution rate of 30 to 100 mg.Math.cm.sup.2h1 in a 3% KCl solution at 93 C.

A method (S) for manufacturing a part (1) out of a metal matrix composite material, including the following steps: opening (S1) a device (10) that includes a supporting portion (14) and a molding portion (14); placing (S2) a fibrous reinforcement into the device (10); sealably closing (S3) the device (10) by providing a space between the fibrous reinforcement (2) and the device portions; feeding (S4) the molten metal matrix (3) into the device (10) such as to fill the space between the fibrous reinforcement (2) and the device portions (13, 14); and applying (S5) a force onto the equipment (10) such as to impregnate the fibrous reinforcement (2) with the metal matrix (3).

A method for manufacturing a quasicrystal and alumina mixture particles reinforced magnesium matrix composite, includes manufacturing a quasicrystal and alumina mixture particles reinforcement phase, including preparing raw materials for the quasicrystal and alumina mixture particles reinforcement phase including a pure magnesium ingot, a pure zinc ingot, a magnesium-yttrium alloy in which the content of yttrium is 25% by weight, and nanometer alumina particles, the elements having the following proportion by weight 40 parts of magnesium, 50-60 parts of zinc, 5-10 parts of yttrium and 8-20 parts of nanometer alumina particles of which the diameter is 20-30 nm, pretreating the metal raw materials, cutting the pure magnesium ingot, the pure zinc ingot and the magnesium-yttrium alloy into blocks, removing oxides attached on the surface of each metal block, placing the blocks into a resistance furnace to preheat at 180 C. to 200 C., and filtering out the absolute ethyl alcohol after standing, and drying.

A steering-wheel core eliminating or reducing the need to perform finishing processing after casting and decreasing a manufacturing cost even when the steering-wheel core is cast using a molten metal process. The steering wheel core includes a boss core portion coupled to a steering shaft, a rim core portion and a spoke core portion. The boss core portion forms a nut seat surface that makes contact with a nut when the nut is fastened to a distal end of the steering shaft. A recess is formed in the nut seat surface depressed toward a back surface side of the boss core portion. The recess is preferably provided in an annular form so as to surround the circumference of the nut seat surface.