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采用自制的电磁搅拌装置，制备出具有球形初生相微粒的半固态Ａｌ６．６％Ｓｉ合金。研究了冷却速率和搅拌强度对半固态合金的球形初生相微粒形成的影响。球形初生相颗粒的生成必须具有适当的冷却速率，而高的磁感应强度则有利于初生相颗粒的细化、球化和均匀化。提出了球形初生相微粒演化机理，认为剧烈的搅拌使初生相在长大过程中，不断发生枝晶臂的弯曲融合、熔断和机械断裂。
The semisolid Al6.6% Si alloy with spherical primary particles was prepared by self-made electromagnetic stirring device. The effects of cooling rate and stirring intensity on the formation of spherical primary particles in semisolid alloys were investigated. The formation of spherical primary phase particles must have an appropriate cooling rate, while the high magnetic induction is conducive to the refinement of the primary phase particles, spheroidization and homogenization. The evolution mechanism of spherical primary particles is proposed. It is believed that the gradual stirring, dendritic arm bending, fusing and mechanical fracture occur continuously during the growth of primary phase.