Abstract: A method for the production of master alloys intended for grain refining of aluminum melts and being of the type which comprises of aluminum and 1-15 percent by weight titanium, where titanium is present in the form of intermetallic crystals of titanium aluminide in combination with additives of carbon and/or nitrogen. The method is characterized by adding carbon and/or nitrogen to the aluminum melt in an amount corresponding to at least 0.01 percent by weight in the resultant solidified material. The addition of the carbon and/or nitrogen is effected in elemental form or in the form of dissociable carbon and/or nitrogen containing compounds, making said addition before of during an established thermodynamic state of dissolution of existing crystals of titanium aluminide, and bringing the melt into a thermodynamic state where crystals of titanium aluminide present grow in size and thereafter causing the melt to solidify. Also a master alloy produced according to the above method is claimed.

Abstract: A process is described for the preparation of an aluminium-strontium master alloy suitable for use as structure refiner during the solidification of molten aluminium-silicon alloys, comprising atomizing a molten alloy containing 3 to 30% by weight of strontium, the balance being aluminium, quick cooling of the atomized droplets to obtain solid particles and consolidation of the obtained solid particles.