The present invention relates to a method for grain refining of aluminium andaluminium alloys wherein a siliconboron alloy containing between 0.01 to 4.0 %byweight of boron is added to molten aluminium or aluminium alloy in such anamountthat the resulting melt of aluminium or aluminium alloy contains at least 50ppm boron.The invention further relates to a grain refining alloy for aluminium andaluminiumalloys which grain refining alloy is a siliconboron alloy containing between0.01 and4.0 % by weight of boron.
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