Al-6.5%Mg合金的半固态流变铸造及其性能
摘要
Semi-solid rheocasting of Al-6.5% Mg alloy was studied by using the method of thermal electromagnetic stirring to prepare semisolid slurry. The microstructure, mechanical properties and tensile fracture of the castings under the conditions of constant pressure casting, liquid metal die-casting and semisolid die-casting were compared. The results demonstrate that the Al-6.5%Mg alloy produced by conventional casting has coarse dendritic grains with low mechanical properties. Compared with constant pressure casting, the dendritic grains from liquid metal die-casting are more regular and finer, the strength and plasticity of liquid metal die-casting are improved. The microstructure in semisolid die-casting shows regular spherical grains. Compared with liquid metal die-casting, the strength in semisolid die-casting is slightly improved, and showing a better plasticity.