Abstract
The effects of 3.76, 3.98 and 4.22 Zn/Mg ratios on the T6 State Microstructure and properties of Al-xZn-2.6Mg-0.94Cu-0.2Zr-0.8Ti cold extruded aluminium alloy were studied by means of metallographic structure analysis, insoluble phase analysis, XRD analysis, hardness and electrical conductivity test, tensile property test and corrosion test. The results show that when the ratio of Zn/Mg increases from 3.76 to 4.22, the grain size of the alloy tends to grow, the recrystallization degree increases, the amount of undissolved phases increases, and the dislocation strengthening decreases slightly under solid solution at 450 °C × 2 h + 460 °C × 2 h + 470 °C × 2 h and aging treatment at 120 °C × 24 h. And the tensile strength at room temperature and elongation after fracture decrease gradually, and the intergranular corrosion resistance also decreases gradually. Therefore, the optimum composition of this experiment should be Al-9.74Zn-2.59Mg-0.94Cu-0.195Zr-0.83Ti (corresponding to the ratio of Zn/Mg 3.76), with room temperature tensile strength of 727.77 MPa, post-break elongation of 5.1%, and general intergranular corrosion resistance.
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