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:In paper, recycled Al-1.15Mg-1.02Si-0.7Cu alloy was optical prepared by meiting and casting, the microstructural evolution of the alloy were analyzed by using optical nicroscopy(OM), scanning e!ectron microscopy (SEM), e!ectron back scattered diffraciion(EBSD) and transmission e!ectron nicroscope(TEM),the effects of heal treatment on the mechanical and corrosionlresistant properties of the extruded proUes were invesiigated. The results show that the recrystaliization of the alloy was competed by soiid solution at 550C and fine equaaxaal crystass were obtanned. The iime required for the alloys to reach peak hardness under artificia1 aging cond!tions at 155,175 and 195 C was 18,8 and 4 h, respectively, and the peak hardnesses were 132.96 HV,132. 94 HV and 132.22 HV, respectively, wtth the extruded profiles obtanning the highest tensle strength of 410. 42 MPa and higher elongation of 14. 75% under aging cond!tions at 175 C/8 h. The optimizedsoid solution process ss 550 C/1 hand the artifidal aging process ss 175 C/8 h. The tendency of the alloy to intergranular corrosion ss more pronounced,and the alloy corrodes most severely under peakaged cond!tions, followed by over-aged and weakest underaged. [ABSTRACT FROM AUTHOR]

As a preparation material for important components such as conductive springs and interconnect connectors, the large scale industrial preparation method and heat treatment process of Cu Ti alloy are still the key areas that urgently need to be developed and promoted in the current copper alloy field. In the present paper, Cu Ti alloys with Ti content of 1%, 4. 5 % and 10% were prepared by aluminothermic reaction, which has the advantages of simple process, environmental protection, energy saving and low cost, and the comprehensive properties of the alloys were further regulated by solid solution and aging treatment. The results show that the Ti elements in the aged Cu l%Ti and Cu 4.5%Ti alloys are mainly in the state of solid solution with only a small amount of smaller precipitates, while there are a large amount of precipitates in the aged Cu 10% Ti alloys. With the increase of Ti content, the electrical conductivity of the alloys shows a significant decrease trend, while the hardness and strength show the opposite trend. For the alloys with the same composition, compared to the solid solution state, the conductivity first slightly decreases and then increases with aging time. After aging at 450 °C for 4 h, the conductivity of all three component alloys is higher than that of the solid solution state alloys* After aging at 450 °C for 2 h, the hardness, strength and elongation of Cu l%Ti and Cu 4. 5%Ti alloys obtain the maximum values, and the hardness and elongation of Cu 10 % Ti alloys also obtain the maximum values, while the yield and the tensile strength of Cu 10%Ti alloys show slightly decreasing trend with aging time. [ABSTRACT FROM AUTHOR]