Master alloy for modification and grain refining of hypoeutectic and eutectic alloys Al-Si casting.

摘要

A master alloy for modification and grain refining of hypoeutectic and eutectic Al-Si based foundry alloys is described. In addition to unavoidable contaminants the alloy contains nucleating and modifying additions of Ti, B and Sr, wherein the content of Ti is between 0,5 and 2,0 % by weight, the content of B is between 0,5 and 2,0 % by weight and the content of Sr is between 3,0 and 12,0 % by weight, with the ratio Ti/B between 0,8 and 1,4. A method for the preparation of said master alloy is also described.