采用室温拉伸试验、Kahn 撕裂试验，结合光学显微镜、透射电子显微镜等方法，研究了 Al-5Zn-3Mg-1Cu 铝合金厚板在热轧过程中随轧制变形量增大其合金组织和力学性能的演变过程． 结果表明:热轧变形过程中，变形量从 56% 增大至 91% 时，合金的再结晶分数由 0． 49%增大至 43． 30%，晶粒尺寸从 83μm 减小至 10μm 以下，合金的抗拉强度和屈服强度分别从 542． 3 和 520． 0MPa 提升到 593． 4 和 564． 9 MPa，延伸率从 8． 0% 左右提高到 11． 2%;随轧制变形量的增大，合金撕裂强度和单位面积裂纹形核功呈增大的趋势．

Tensile test at room temperature and Kahn tear test were conducted to investigate the evolution of the microstructure and mechanical properties of Al-5Zn-3Mg-1Cu thick plate during the hot rolling by means of OM and TEM． The results show that (1) during the hot rolling of the aluminum alloy，both the deformation and the fraction of recrystallization increase respectively from 56% and 0. 49% to 91% and 43. 30%，while the grain size decreases from 83μm to below 10μm; (2) meanwhile，the tensile strength and yield strength of the aluminum alloy increase respectively from 542. 3 and 520. 0MPa to 593. 4 and 564. 9MPa，and the elongation increases from about 8. 0% to 11. 2%; and (3) as the deformation increases，the tear strength (TS) and UIE of the aluminum alloy tend to increase．