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Influence of serpentine channel pouring process parameters on semi-solid A356 aluminum alloy slurry 被引量:7

蛇形通道浇注工艺参数对半固态A356铝合金浆料的影响(英文)
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摘要 Semi-solid A356 aluminum alloy slurry was prepared by using serpentine channel pouring process, and the influences of the channel diameters and pouring temperatures on the semi-solid A356 aluminum alloy slurry were investigated. The experimental results show that when the channel diameter is 20 and 25 mm, respectively, and the pouring temperature is 640-680 ℃, the average diameter of primary α(Al) grains in the prepared A356 aluminum alloy slurry is 50-75 and 55-78 μm, respectively, and the average shape factor of primary α(Al) grains is 0.89-0.76 and 0.86-0.72, respectively. With the decline in the pouring temperature, the microstructure of semi-solid A356 aluminum alloy slurry is more desirable and a serpentine channel with smaller diameter is also advantageous to the microstructure imProvement. During the preparation of semi-solid A356 aluminum alloy slurry, a large number of nuclei can be produced by the chilling effect of the serpentine channel, and owing to the combined effect of the chilled nuclei separation and melt self-stirring, primary α(Al) nuclei can be multiplied and spheroidized finally. 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。
出处 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第5期985-990,共6页 中国有色金属学报(英文版)
基金 Project (2006AA03Z115) supported by the National High-tech Research and Development Program of China Project (2006CB605203) supported by the National Basic Research Program of China Project (50774007) supported by the National Natural Science Foundation of China
关键词 SEMI-SOLID A356 aluminum alloy serpentine channel primary α(Al) 半固态 A356铝合金 蛇形通道 初生α(Al)
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