日本专利特开2014-76454本专利提供一种在铝液冷却过程中低成本地细化初晶Si和共晶晶粒的Al-Si铸造合金的制造方法。本专利细化晶粒的实质就是,在铝液冷凝过程中对其施加超声振动。在Al-Si合金中,从开始析出初晶Si到达到共晶温度的这段时间里,对铝液施加第一次超声振动,使初晶Si得到细化。随后将铝液浇入铸型中,当铝液的温度高于共晶温度的这段时间里,即在共晶析出温 Japanese Patent Laid-Open No. 2014-76454 This patent provides a method of manufacturing an Al-Si cast alloy that is refined at a low cost for primary Si and eutectic grains during the aluminum liquid cooling. The essence of this patent grain refinement is that the aluminum liquid is subjected to ultrasonic vibration during its condensation. In the Al-Si alloy, the first ultrasonic vibration is applied to the aluminum liquid to refine the primary Si from the time when the primary Si precipitates to the eutectic temperature. Then the aluminum liquid poured into the mold, when the liquid aluminum temperature is higher than the eutectic temperature of this period of time, that eutectic precipitation temperature