通过对211Z.1铝合金半连续水冷铸造棒热挤压加工后T6热处理，挤压材纵向晶粒被压扁拉长，脆硬相被 挤碎，晶界上未固溶相破碎细化，分布均匀。 铸造试样平均抗拉强度为476MPa，挤压试样平均抗拉强度为524MPa，挤 压试样比铸造试样强度高出48MPa，强度得到一定程度提高。 铸造试样和挤压试样在NaCl+H2 O2溶液中浸蚀6h后强 度分别下降了38、22MPa，下降程度分别为7.98%、4.2%，伸长率下降程度分别为37.7%、11.5%，挤压试样力学性能的下 降程度小于铸造试样。铸造试样的晶间腐蚀深度约为178μm，挤压试样的腐蚀深度约为85μm，晶间腐蚀等级分别为4 级和3级，热挤压工艺提高了211Z.1铝合金抗晶间腐蚀能力。 对211Z.1合金材料采用热挤压加工，能够得到综合性能 更优的产品。

 Conclusions were drawn by analysing the 211Z.1 aluminium alloy direct chill semi-continuous casting sample and hot-extruded sample after T6 heat treatment. The longitudinal grain of the extruded sample is flattened and elongated, the brittle and hard phase is crushed, the unsolidly soluble phase on the grain boundary is broken, and the distribution is uniform. In terms of mechanical properties, the average tensile strength of the cast sample is 476 MPa, and that of the extruded sample is 524 MPa. The tensile of the extruded sample is 48 MPa higher than that of the cast sample, which proves that the strength has been improved to a certain extent. In the terms of corrosion resistance, after etching in NaCl+H2 O2 solution for 6 h, the strength of the cast sample decreases by 38 MPa, and reduction degree is 7.98%, while those of the extruded samples are by 22 MPa and 4.2%. In addition, the elongation decreases by 37.7% and 11.5% respectively. The intergranular corrosion depth of the cast samples is approximately 178 μm, and the grade is 4, while that of the extruded samples is approximately 85 μm and grade 3. The comparative study shows that the mechanical properties, intergranular corrosion resistance and microstructure uniformity of the 211Z.1 aluminium alloy can be improved to some extent and the comprehensive properties will be improved by the hot extrusion process.