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采用蛇形通道浇注技术制备半固态A356铝合金浆料,并研究浇注温度和通道直径对半固态A356铝合金浆料的影响。结果表明:当通道直径为20和25mm、浇注温度为640-680℃时,可以制备出初生相α(Al)的半固态浆料,其平均形状因子分别为0.89-0.76和0.86-0.72、平均晶粒直径分别为50-75μm和55-78μm。随着浇注温度的降低,半固态A356铝合金浆料中初生α(Al)晶粒的组织变得细小;较小的通道直径有利于组织的改善。在制备半固态A356铝合金浆料过程中,通道内壁的激冷能够产生大量的晶核。由于晶粒游离和合金熔体自搅拌的共同作用,初生α(Al)晶核能够在熔体内部增殖并且球化。
The semi-solid A356 aluminum alloy slurry was prepared by the serpentine channel casting technique and the effect of pouring temperature and channel diameter on semi-solid A356 aluminum alloy slurry was studied. The results show that when the channel diameter is 20 and 25 mm and the pouring temperature is 640-680 ℃, the semisolid slurry of primary phase α (Al) can be prepared with average shape factors of 0.89-0.76 and 0.86-0.72, respectively. The average The grain diameters are 50-75 μm and 55-78 μm, respectively. With the decrease of pouring temperature, the microstructure of primary α (Al) grains in the semi-solid A356 aluminum alloy slurry became finer; the smaller diameter of the channel favored the improvement of the structure. During the preparation of semi-solid A356 aluminum alloy slurry, chilling of the inner wall of the channel can produce a large number of nuclei. The primary α (Al) nuclei can proliferate and spheroidize inside the melt due to the combined effect of grain free and self-agitating alloy melt.