Microstructure and Properties of the Recycled Al-1.15Mg-l.02Si-0.7Cu Alloy with High Strength and Toughness
In paper,recycled Al-1.15Mg-1.02Si-0.7Cu alloy was optical prepared by melting and casting,the microstructural evolution of the alloy were analyzed by using optical microscopy(OM),scanning electron microscopy(SEM),electron back scattered diffraction(EBSD)and transmission electron microscope(TEM),the effects of heat-treatment on the mechanical and corrosion-resistant properties of the extruded profiles were investigated.The results show that the recrystallization of the alloy was completed by solid solution at 550℃ and fine equiaxial crystals were obtained.The time required for the alloys to reach peak hardness under artificial aging conditions at 155,175 and 195 ℃ was 18,8 and 4 h,respectively,and the peak hardnesses were 132.96 HV,132.94 HV and 132.22 HV,respectively,with the extruded profiles obtaining the highest tensile strength of 410.42 MPa and higher elongation of 14.75％under aging conditions at 175 ℃/8 h.The optimizedsolid solution process is 550 ℃/1 h,and the artificial aging process is 175 ℃/8 h.The tendency of the alloy to intergranular corrosion is more pronounced,and the alloy corrodes most severely under peak-aged conditions,followed by over-aged and weakest under-aged.
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