CAJ | 학술논문

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.
채용사형통도요주기술제비반고태A356려합금장료,병연구요주온도화통도직경대반고태A356려합금장료적영향.결과표명:당통도직경위20화25mm、요주온도위640-680℃시,가이제비출초생상α(Al)적반고태장료,기평균형상인자분별위0.89-0.76화0.86-0.72、평균정립직경분별위50-75μm화55-78μm.수착요주온도적강저,반고태A356려합금장료중초생α(Al)정립적조직변득세소;교소적통도직경유리우조직적개선.재제비반고태A356려합금장료과정중,통도내벽적격랭능구산생대량적정핵.유우정립유리화합금용체자교반적공동작용,초생α(Al)정핵능구재용체내부증식병차구화.
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.