A vacuum arc remelt apparatus comprising a crucible having a wall, said wall having an interior and an exterior opposite said interior; an electrode within the crucible proximate the interior; an ingot within the crucible and below the electrode, wherein said ingot includes a crown and shelf; and a vibration source at the exterior of the crucible proximate the crown and shelf.

An injection device of light metal injection molding machine and an injection control method thereof are provided, in which a melt in a supply unit is supplied into an injection unit through a communication passage, a plunger of the injection unit is retracted to measure the melt, the communication passage is closed, and the plunger is advanced to inject the melt into a mold device through an injection nozzle of the injection unit. After the injection and before the measurement, the plunger is advanced under a pressure at which the melt does not come out from the injection nozzle to make the melt in the injection unit flow back into the supply unit through the opened communication passage.

Steam exhaust ports are located around a perimeter of a direct chill casting pit, at various locations from below the top of the pit to the pit bottom to rapidly remove steam from the casting pit with addition of dry excess air. Gas introduction ports are also located around a perimeter of the casting pit and configured to introduce an inert gas into the casting pit interior.

Metal-nanoparticle composites, such as metal-boron nitride nanoparticle composites, and methods of manufacturing the same are provided. Ultrasonic casting techniques can be used to achieve uniform dispersion of nanoparticles, such as boron nitride nanotubes (BNNTs) in a metal matrix, such as aluminum. The BNNTs can be incorporated into the melt of the metal, and ultrasonic treatment can then be applied.

Metal-nanoparticle composites, such as metal-boron nitride nanoparticle composites, and methods of manufacturing the same are provided. Ultrasonic casting techniques can be used to achieve uniform dispersion of nanoparticles, such as boron nitride nanotubes (BNNTs) in a metal matrix, such as aluminum. The BNNTs can be incorporated into the melt of the metal, and ultrasonic treatment can then be applied.

A foundry casting system and process employs an inert gas delivery and recovery system for casting parts which results in cast parts having improved metalurgical characteristics. The system may be employed in sand, die casting, semi-permanent and permanent casting environments. Pressurized inert gas may be diffused into the mold before, during and after the metal pouring step. The resulting casting is free from oxides and dissolved hydrogen gas as they are removed from the mold cavity. This results in higher quality castings as well as increased production output due to faster cooling cycles.

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.

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 die-casting magnesium alloy. The die-casting magnesium alloy comprises, by mass percent, 1% to 5% of La, 0.5% to 3% of Zn, 0.1% to 2% of Ca, 0.1% to 1% of Mn and the balance Mg and other inevitable impurities. The die-casting magnesium alloy manufacturing method comprises smelting, refinement and die-casting. The die-casting magnesium alloy has good mechanical performance, die-casting performance and heat conduction performance.

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.