Abstract: A double-pin friction stir device may include an annular friction surface with a central hole, where the annular friction surface is rotatable about a normal axis of the annular friction surface in a first direction. The device may further include a first pin extending through the central hole along a normal axis of the annular friction surface. A distal end of the first pin may protrude from the annular friction surface and the first pin may rotate about a longitudinal axis of the first pin in the first direction. The device may further include a second pin extending through the central hole along and parallel with the first pin, where a distal end of the second pin protrudes from the annular friction surface. The second pin rotates about a longitudinal axis of the second pin in a second direction opposite the first direction.

Abstract: A method and apparatus for producing metal matrix nanocomposites is disclosed. The method may include obtaining a nanodispersion by dispersing a plurality of nanoparticles into an inert gas within a dispersion chamber. Dispersing the plurality of nanoparticles into the inert gas may include injecting a pressurized stream of the inert gas into the dispersion chamber, and mechanically mixing the inert gas and the plurality of nanoparticles. The method may further include injecting the nanodispersion into a volume of molten metal, obtaining a molten mixture by mechanically mixing the nanodispersion with the volume of molten metal, and applying a casting process on the molten mixture by transferring the molten mixture into a die.

Abstract: A method and apparatus for producing metal matrix nanocomposites is disclosed. The method may include obtaining a nanodispersion by dispersing a plurality of nanoparticles into an inert gas within a dispersion chamber. Dispersing the plurality of nanoparticles into the inert gas may include injecting a pressurized stream of the inert gas into the dispersion chamber, and mechanically mixing the inert gas and the plurality of nanoparticles. The method may further include injecting the nanodispersion into a volume of molten metal, obtaining a molten mixture by mechanically mixing the nanodispersion with the volume of molten metal, and applying a casting process on the molten mixture by transferring the molten mixture into a die.