(哈尔滨工程大学 材料科学与化学工程学院，哈尔滨 150001)
摘 要: 利用保温电磁搅拌制备半固态浆料，对Al-6.5%Mg合金的半固态流变铸造进行研究。实验中对该合金的常压铸造、液态压铸和半固态压铸所得铸件的显微组织、力学性能和拉伸断口进行分析比较。结果表明，常压铸造得到的Al-6.5%Mg合金组织为粗大的树枝晶，力学性能较低；与常压铸造相比，液态压铸件的树枝晶生长较为规则，枝晶得到细化，同时，液态压铸件的强度和塑性提高明显；半固态压铸的显微组织则为规则的球状晶，与液态压铸相比，半固态压铸件的强度略有提高，表现出更好的塑性。
关键字: 流变铸造；保温电磁搅拌；球状晶；强度；塑性
（College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China）
Abstract:Semi-solid rheocasting of Al-6.5% Mg alloy was studied by using the method of thermal electromagnetic stirring to prepare semi-solid slurry. The microstructure, mechanical properties and tensile fracture of the castings under the conditions of constant pressure casting, liquid metal die-casting and semi-solid 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 semi-solid die-casting shows regular spherical grains. Compared with liquid metal die-casting, the strength in semi-solid die-casting is slightly improved, and showing a better plasticity.
Key words: rheocasting; thermal electromagnetic stirring; spherical grains; strength; plasticity
