Abstract
A detailed investigation of Zn/Mg ratio on the microstructure and properties of Al-xZn-2.0Mg-1.0Cu-0.2Zr-0.5Ti and Al-xZn-2.0Mg-1.0Cu-0.2Zr-1.0Ti ultrahigh-strength aluminum alloy extrusion by means of optical microscopy (OM), scanning electron microscopy (SEM), x-ray diffraction (XRD), tensile test and intergranular corrosion resistance test. In the four samples, Al-9.5Zn-2.0Mg-1.14Cu-0.19Zr-0.38Ti and Al-10.5Zn-2.05Mg-1.02Cu-0.2Zr-0.92Ti alloys got the best properties. The tensile strength is 735.4 MPa and 690.5 MPa respectively. The elongation is 12.3% and 9.6% and the maximum intergranular corrosion depth is 132.36 μm and 103.36 μm. The results indicate that Al-xZn-2.0Mg-1.0Cu-0.2Zr-(yTi) alloy extrusion which was treated by solution treatment (450 °C × 2 h + 460 °C × 2 h + 470 °C × 2 h, water quenching) and aging process (121 °C × 24 h) got better microstructure, mechanical properties and anti-intergranular corrosion properties with the increased of Zn/Mg ratio. As the Zn/Mg ratio went up, the grain of Al-xZn-2.0Mg-1.0Cu-0.2Zr-(yTi) alloy became smaller and the comprehensive performance such as dislocation strengthening, tensile strength, elongation and intergranular corrosion resistance resulted in a higher level.
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