(东北大学材料与冶金学院，沈阳 110006
墨尔本大学机械制造工程系，澳大利亚)
摘 要: 采用常规铸造和液相线铸造的2618铝合金在Gleeble-1500型热学-力学模拟试验机上在不同变形温度和变形速率下进行半固态压缩，变形温度为490～600℃，变形速率为5×10-3～5×10-1s-1。结果表明，常规铸造组织、液相线铸造组织半固态压缩变形抗力均小于固态压缩变形抗力，并且液相线铸造获得的细小、等轴、非枝晶组织在半固态压缩时的变形抗力小于常规铸造枝晶组织的变形抗力。液相线铸造组织的成形性能优于常规铸造组织。
关键字: 铝合金 常规铸造 液相线铸造 半固态 压缩变形
（Materials and Metallurgy College, Northeastern University, Shenyang 110006, P. R. China
Department of Mechanical and Manufacturing Engineering, Melbourn University, Australia）
Abstract:2618 aluminum alloy attained by conventional casting and liquidus casting was compressed in semi-solid at different deformation temperatures from 490 ～600℃ and different deformation rates ranging from 5×10-3 to 5 ×10-1s-1 by means of Gleeble-1500 thermal-mechanical simulator. The results showed that the resistance to deformation of compression in semi-solid state is lower than that in solid state, for both conventional casting and liquidus casting structures; the resistance to deformation of the fine, equiaxed and non-dendritic grains of primary microstructure attained by liquidus casting in semi-solid state is remarkably lower than that of conventional casting dendritic microstructure; the formability of liquidus cast structure is better than that of the conventional cast structure.
Key words: 2618 aluminum alloy; conventional casting; liquidus casting; semi-solid; compression deformation
