熔体混合对过共晶Al-Si合金细化的研究
Investigation on Refinement of Hyper-Eutectic Al-Si Alloy by Melt Mixing
张凤巍，李 智，王建华，苏旭平
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作者单位：（湘潭大学 材料设计及制备技术湖南省重点实验室，湖南 湘潭 411105）
中文关键字：过共晶Al-Si合金; 细化处理; 熔体混合
英文关键字：hyper-eutectic Al-Si alloy; refinement; melt mixing
中文摘要：研究了高温Al-30%Si合金熔体和低温Al-7%Si合金熔体混合后浇铸得到的过共晶Al-Si合金显微组织及力学性能。结果表明：不同成分的高低温熔体混合后可有效细化过共晶Al-Si合金的初晶Si尺寸；混合前熔体温差越大，初晶Si细化效果越好；随着混合后静置时间的增加，初晶Si的尺寸变大，Al-Si合金硬度增加。并探讨了其细化机理。
英文摘要：The microstructure and property of hyper-eutectic Al-Si by mixing the high temperature hypereutectic Al-30%Si alloy melt and the low temperature hypoeutectic Al-7%Si alloy melt was investigated. The results show that primary Si granules are greatly refined by melt mixing with different temperature of Al-Si alloys. The greater the temperature difference, the finer the size of primary Si. With the increase of waiting time, the size of primary Si become larger and the hardness of Al-Si alloys increase. The mechanics of modification is also studied.