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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 - 1 s- 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
The 2618 aluminum alloy cast by conventional casting and liquidus casting was subjected to semi - solid compression at different deformation temperature and deformation rate on a Gleeble - 1500 thermal - mechanical simulator with a deformation temperature of 490-600 ℃ and a deformation rate of 5 × 10 - 3 ~ 5 × 10 - 1 s-1. The results show that the semi-solid compressive deformation resistance of castings and liquidus castings is smaller than that of solid state, and the deformation resistance of fine, equiaxed and non-dendritic structures obtained by liquidus casting is smaller than that of conventional Casting dendrite deformation resistance. Liquidus castings have better formability than conventional castings