Abstract: Influence of pre-deformation temperature on microstructure and mechanical properties of Al-Zn-Mg aluminum alloy was investigated. The microstructure was characterized by using OM and TEM. The fracture morphology was investigated by using SEM. The texture was tested by using XRD tester. The mechanical properties were tested by using tensile testing machine. The results indicate that the optimum mechanical properties are achieved after hot deformation under 400 ℃, the yield strength and tensile strength respectively reaches 325 MPa and 455 MPa, while the elongation after fracture reaches 14%. The fracture morphology shows ductile fracture characteristics, and there are dimples with different numbers and sizes at the fracture surface. The dislocation entanglement inside the grains disappears and the dislocation wall is formed after deformation under 400 ℃. The dislocations inside the grains disappear and the recrystallization grains are formed under 450 ℃. The texture is composed of shear texture under 350 ℃ and 400 ℃, including rotation cube texture{001}<110> and brass R texture{111}<112> and {111}<110>. Obvious recrystallization texture Cube_ND {001}<310> is appeared after deformation under 450 ℃.

Key words: Al-Zn-Mg aluminum alloy, pre-deformation, texture, microstructure, mechanical properties