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采用电磁搅拌法研究 Al- 5 wt% Cu合金在连续冷却条件下的凝固组织 ,分析初生相形成过程。结果表明 ,熔体中的初生相来源于型壁上枝晶游离和熔体内部形核与生长 ;受电磁搅拌影响 ,初生相由树枝晶逐步演化为块状或粒状晶 ,在连续冷却条件下初生相并不能完全粒状化 ;电磁搅拌对非枝晶组织的聚集与分散具有双重作用。
The solidification structure of Al-5 wt% Cu alloy under continuous cooling condition was studied by electromagnetic stirring method, and the formation of primary phase was analyzed. The results show that the primary phase in the melt originates from the dendrite dissociation in the mold wall and the nucleation and growth of the melt. The primary phase gradually changes from dendrites to massive or granular crystals under the influence of electromagnetic stirring. Under the condition of continuous cooling, Phase does not completely granular; electromagnetic stirring on the non-dendritic tissue aggregation and dispersion has a dual role.