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以Al-K2Ti F6为反应体系,采用电磁搅拌法制备了原位Al3Ti/ADC12复合材料半固态浆料,研究了不同搅拌参数对该复合材料半固态组织的影响,揭示了半固态组织在电磁场作用下的演变机理。结果表明:在本实验降温搅拌过程中,随着搅拌时间的逐渐增加,该复合材料半固态组织中的初生α-Al相形貌发生了多样性变化,经历了树枝状、蔷薇状、近球状的演变,其中在585℃时水淬取样的组织较佳,初生α-Al相主要呈近球状,弥散悬浮于液相中,平均尺寸约为35.2μm。在一定范围内,若固定相同的搅拌频率和搅拌时间,在降温搅拌过程中,随着搅拌电压的增大,晶粒形貌趋于圆整,尺寸逐渐变小;若固定相同的搅拌电压和搅拌时间,在降温搅拌过程中,随着搅拌频率的增大,晶粒逐渐细化而后又逐渐增大。
In-situ Al3Ti / ADC12 composite semi-solid slurry was prepared by electromagnetic stirring method with Al-K2TiF6 as reaction system. The influence of different stirring parameters on the semi-solid structure of the composite was investigated. The effect of semi-solid structure on electromagnetic field Under the evolution mechanism. The results show that the morphology of primary α-Al phases in the semi-solid state composites varied with the increasing of stirring time during the process of cooling and mixing in this experiment, which experienced dendritic, rosette and nearly spherical The structure of water-quenched sample was better at 585 ℃. The primary α-Al phase was mainly spherical and dispersed in the liquid phase with an average size of 35.2μm. Within a certain range, if the same stirring frequency and stirring time are fixed, during the process of cooling and stirring, as the stirring voltage increases, the grain shape tends to be rounded and the size gradually becomes smaller; if the same stirring voltage and Stirring time, stirring in the cooling process, with the stirring frequency increases, the grain gradually refined and then gradually increased.