中文摘要：

以自主熔炼的7085铝合金（Al-7.0Zn-1.41Mg-1.50Cu-0.14Zr-0.023Sr）为实验对象,通过EBSD、XRD、硬度及电导率、拉伸性能、晶间腐蚀及剥落腐蚀试验,研究了热压缩—ECAP—热压缩—预回复—固溶—时效态下7085铝合金不同方向的组织与性能。研究表明：ECAP后续增加的热压缩处理进一步促进了合金的再结晶,消除了大部分ECAP加工后的位错和亚晶,小角度晶界比例提高,平均晶粒尺寸变大。热压缩对合金硬度和电导率峰值大小影响不大,抗拉强度和屈服强度降低,塑性变化不大,同时力学性能的各向异性变大。抗晶间腐蚀性能和抗剥落腐蚀性能均有所提高,但是相比于热压缩—ECAP—预回复—固溶—时效处理,其抗腐蚀性能的各向异性变大。

英文摘要：

Microstructure, properties and anisotropy of 7085 aluminum alloy （Al-7.0Zn-1. 41Mg-1.50Cu-0. 14Zr-0. 023Sr） under thermal compression-ECAP-thermal compression-pre-recovery-solution-aging treatment were studied by means of EBSD technique, XRD, hardness and electrical conductivity, tensile properties, intergranular corrosion and exfoliation corrosion tests. The results show that, the recrystallization of the alloy is further promoted by the thermal compression after ECAP, most of the dislocations and sub-grains after ECAP processing are eliminated, low angle grain boundary increases, and average grain size increases. Thermal compression has little effect on the hardness and conductivity of the alloy, the tensile strength and yield strength decrease and the plasticity changes slightly, the anisotropy of the mechanical property becomes larger. The anti intergranular corrosion resistance and spalling corrosion resistance of the alloy arc improved, but compared with thermal compression-ECAP-pre-recovery-solution-aging treatment, the anisotropy of corrosion resistance of the alloy increases greatly.