提出了在电磁搅拌制备半固态A356铝合金浆料时插拔Cu棒的一个新工艺. 由于在半固态铸锭轴向区域引入低温, 可进一步提高电磁搅拌效果, 铸锭各部位均由细小α--Al晶粒组成. 该工艺还可适当提高低过热度浇注的温度而有利于实际生产.
Because of the solidifying characteristic of alloy and the difference in thermal conductivity of mould, the microstructures of different zones of semi–solid slurry are different, which is hard to satisfy the requirement of rheoforming. A new process preparing semi–solid slurry is proposed, in which a locally rapid cooling near the center zone of mould can be realized by inserting a copper rod into the slurry and then pulling out repeatedly, except application of a weakly electromagnetic stirring. Semi–solid A356 alloy slurry was prepared by the new process and the effects of the new process on morphology and size of primary α–Al in semi–solid A356 were researched. The results indicate that the nucleation rate, morphology and grain size of primary α–Al are markedly improved by the new process. Primary α–Al with small size presents particle–like or globular–like and distributes uniformly in the slurry even at lower overheating. The grain refining and structural homogeneity are relative to homogenization of the temperature field in the mould.
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