PRODUCTION OF ULTRA-FINE GRAIN STRUCTURE IN AS-CAST ALUMINUM ALLOYS

摘要

A method of controlling grain size in as-cast aluminum alloy havingthe steps of a) providing a molten aluminum alloy including an alloyingelementselected from the group consisting of Ti, Sc, Zr, V, Hf, Nb and Y; b) adding agrain refiner to the molten aluminum alloy to form a me and c) solidifyingthemelt to form an ingot. The grain refiner includes Ti and B or C, and is addedtothe melt in an amount to yield the concentration in the melt of B or C fromthegrain refiner of about 0.003-0.010 wt. %. Grains in the as-cast aluminum alloyareabout 200 microns or less in size.