Effects of vibration and grain refiner on microstructure of semisolid slurry of hypoeutectic Al-Si alloy

• Published in: Transactions of Nonferrous Metals Society of China 2008-08, Vol.18 (4), p.842-846
• Main Author: 赵君文 吴树森 谢礼志 安萍 毛有武
• Format: Article
• Language: English
• Subjects: grain refiner; hypoeutectic Al-Si alloy; mechanical vibration; semisolid metal; 亚共晶铝硅合金; 半固态金属; 微观结构; 晶粒细化剂; 机械振动
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(08)60146-6

The effects of vibration and grain refiner on the microstructure of semisolid slurry of hypoeutectic Al-Si alloy were studied. The impact of vibration on the convection of liquid was conducted by using a system of water-particle tracer. The 356 melt at temperature of 630-660 ℃ with or without grain refiner Al-5%Ti-1%B was poured into a metal cup as the vibrating vessel, then it was cooled to 590-610 ℃ in the semisolid zone and kept for some time, subsequently vibration with different frequencies was applied. The results show that the primary a（Al） particles become finer and rounder with the increase of vibration frequency. The slurry with primary a（Al） equivalent particle diameter（EPD） of about 90μm and average shape coefficient（ASC） of about 0.5 can be prepared under vibration of 20 Hz. With the combined action of vibration and grain refiner Al-5Ti-B, even smaller and rounder spheroids with EPD of about 85μm and ASC of about 0.6 are obtained.