一种搅拌工艺制备A356半固态浆料的实验研究  

Experimental Study on Preparation of A356 Semisolid Slurry by Stirring Process

作　　者：田文彤[1] 杨辉[1] 曹霞[1] 肖华星[1] 

机构地区：[1]常州工学院机电工程学院,江苏常州213002

出　　处：《铸造技术》2015年第2期455-458,共4页Foundry Technology

基　　金：江苏省高校自然科学基础研究资助项目(07KJD460007);泰州市双创人才资助项目(2013035)

摘　　要：开发了一种制备A356铝合金半固态浆料的搅拌工艺。与现有的机械搅拌和电磁搅拌不同的是该搅拌工艺是在熔融金属开始凝固前进行搅拌,其搅拌的作用是使初生晶均匀分布而不是破碎枝晶,并研究了搅拌棒的材质、插入熔体的温度、旋转速度及其直径对初生晶的形状、尺寸和分布的影响。结果表明,当搅拌棒与熔融金属的材料相同时,搅拌棒表面作为初生晶体的形核位点,生成众多的初生晶核,随着搅拌棒的旋转这些初生晶核不断地从棒表面分离进入熔体中,引起初生晶的细化和球化。通过优化搅拌棒插入熔体的温度、旋转速度及其直径等工艺参数,可以获得尺寸均匀细小的近球形初生晶的理想半固态浆料。A stirring process to produce semisolid slurry of A356 aluminum alloy has been developed. The difference from conventional mechanical stirring and electromagnetic stirring is that the stirring process has been worked before solidification starts, the role of stirring leads to the primary crystals distributed uniformly instead of broken dendrite crystals. And the influences of the stirring rod material, insertion temperature of the molten metal, rotation speed and its diameter on the primary crystal shape, size and distribution have been researched. The results show that when the rod is made of the same material as the molten metal, it acts as a nucleation site to generate numerous nucleated primary crystals, which separated from the rod surface continuously into the molten metal with the rotation of the stirring rod, resulting in the refinement and spheroidization of the primary crystals. The ideal semisolid slurry with homogeneous spherical and fine primary crystals ean be obtained by optimizing rod insertion temperature, rotation speed and its diameter.

关 键 词：A356铝合金 半固态浆料 搅拌工艺 

分 类 号：TG292[金属学及工艺—铸造]