Abstract: A method of removing unwanted inclusion particles from a body of liquid aluminium or aluminium alloy by deposition thereof comprising1.(a) adding to the liquid metal at least one alloying constituent in greater quantity than is eventually required and(b) raising the metal temperature higher than the desired casting temperature and above that liquidus of the alloy below which some intermetallic particles can form,2.

Abstract: A method of forming a filter cake for filtering liquid metal from particles stable within the liquid metal on an inert, liquid metal permeable substrate in the flow path of the liquid metal to be filtered characterized by depositing the particles in the flow path upstream of the substrate to be carried at least partially by the metal flow and dispersed as a pre-wetted and pre-primed filter cake on the substrate.

Abstract: In the casting of ingots of aluminium alloys, containing a readily oxidizable component, in an open-ended mould, a space is enclosed over the molten metal surface adjacent the mould wall and is filled with an inert gas. The enclosure is maintained by a baffle which dips into the molten metal surface close to the baffle. The molten metal surface between the baffle and the mould wall is preferably covered by a layer of an oxide-dissolving flux, which cleanses the meniscus at the metal meniscus/mould wall interface.

Abstract: In the production of alloys, particularly Al alloys, by a continuous casting process a supplementary alloy stream is continuously fed into a main metal stream running to the casting mould. The supplementary alloy stream preferably amounts to 1-20% of the main metal stream and has a liquidus temperature above the temperature of the main metal stream so that on contact with the main metal stream, intermetallic phases are precipitated very rapidly as a result of the high chill rates.This mode of casting reduces the risk of coarse primary particles when casting alloys of high alloying element content. The supplementary alloy stream need not be based on the same metal as the main metal stream. The method is considered suitable for the addition of various metals, such as Zr, Mn, Cu, Fe, to aluminium and aluminium alloys to overcome a variety of difficulties and to produce alloy products of improved properties.