(東北大學材料與冶金學院，沈陽 110006
墨爾本大學機械制造工程系，澳大利亞)
摘 要: 采用常規(guī)鑄造和液相線鑄造的2618鋁合金在Gleeble-1500型熱學-力學模擬試驗機上在不同變形溫度和變形速率下進行半固態(tài)壓縮，變形溫度為490～600℃，變形速率為5×10-3～5×10-1s-1。結(jié)果表明，常規(guī)鑄造組織、液相線鑄造組織半固態(tài)壓縮變形抗力均小于固態(tài)壓縮變形抗力，并且液相線鑄造獲得的細小、等軸、非枝晶組織在半固態(tài)壓縮時的變形抗力小于常規(guī)鑄造枝晶組織的變形抗力。液相線鑄造組織的成形性能優(yōu)于常規(guī)鑄造組織。
關(guān)鍵字: 鋁合金 常規(guī)鑄造 液相線鑄造 半固態(tài) 壓縮變形
（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
