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采用石墨质蛇形通道来制备过共晶Al-Si合金半固态浆料,研究了浇注温度和Si含量对过共晶Al-Si合金初生Si尺寸和形貌的影响。结果表明,经蛇形通道浇注后,浆料的初生Si相得到细化;在高于液相线15~45℃时,浇注温度越低,得到的初生Si相越细小均匀;Si含量低的过共晶Al-Si合金初生Si细化明显,随着Si含量的增大,熔体粘度增大使得初生Si的破碎变得困难,初生Si尺寸也逐渐变大。
The semi-solid slurry of hypereutectic Al-Si alloy was prepared by graphite serpentine channel, and the effect of pouring temperature and Si content on the size and morphology of primary Si in hypereutectic Al-Si alloy was studied. The results show that the primary Si phase of the slurry is refined after pouring through the serpentine channel. The lower the pouring temperature is, the smaller and more uniform the primary Si phase is and the lower the Si content is The Si of the hypereutectic Al-Si alloy is refined remarkably. With the increase of the Si content, the increase of the melt viscosity makes the rupture of the primary Si difficult and the size of the primary Si gradually becomes larger.