紊流通道浇注制备半固态A356铝合金浆料

Preparation of Semi-Solid A356 Al-Alloy Slurry by Water-Cooled Turbulent Channel Casting

采用水冷紊流通道制备半固态A356铝合金浆料，研究了紊流叶片对通道内合金熔体径向温度和半固态浆料组织的影响，分析了球状初生α（A1）晶粒的形成机制。结果表明，合金熔体每流过一个叶片后，径向温差逐渐减小；当浇注温度为650℃时，流过最后一个叶片后，径向温差减小到0～2℃。紊流叶片增大了合金熔体与管壁接触的表面积，促进了初生α（A1）晶核的生成，因此改善初生仪（A1）晶粒的形貌。

The semi-solid A356 aluminum alloy slurry was prepared by using water-cooled turbulent channel, the influence of the turbulent blade on radial temperature of the alloy melt in the channel and microstructure of semi-solid slurry were investigated, and the globular primary α（A1） grain formation mechanism was analyzed. The results show that when alloy melt flow through each of blades, the radial temperature difference gradually decreases. When the pouring temperature is at 650 ℃ and the alloy melt flow through the last blade, the radial temperature difference reduces to 0-2℃. The turbulent blades increase surface area of the alloy melt contacting wall and promote primary α（A1） nucleus formation, thereby primary α （A1） grain morphology is improved.