固液混合铸造Al-20%Mn合金显微组织的研究

Research on Microstructure of the Al-20%Mn Alloy Prepared by Mixed Solid-liquid Casting

高合金含量的Al Mn合金 (含量为 2 0 % ) ,由于Mn含量高 ,传统铸造组织十分粗大 ,力学性能很差 ,不能应用。采用固液混合铸造技术制备了Al 2 0 %Mn ,探讨了固液混合铸造制备微晶合金的机理。研究表明 ,合金的显微组织明显细化 ,其平均晶粒尺寸都能控制在 10 μm以下 ,且晶粒呈球形或近球形 。

Common casting high alloyed Al-Mn alloy with compositions about 20% can not be used as structural materials due to coarse microstructures which lead to lower mechanical properties. In this paper, a novel mixed semi-solid casting technology was applied to prepare Al-20%Mn alloy. The formation mechanisms of minicrystal structure during mixed solid-liquid casting process were also discussed. The experimental results show that the grain can be obviously refined via this new developed technology, the average grain size of the as-prepared samples was less 10μm with spherical and near-spherical shape. The microstructure is better than that of the alloys prepared by common casting or semi-solid casting without adding powder.