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采用X射线衍射分析(XRD)、电子背散射衍射分析(EBSD)、电导率测试、硬度测试、拉伸试验、晶间腐蚀试验和剥落腐蚀试验等方法,研究了预回复工艺对7085铝合金组织与性能的影响。结果表明,固溶前的预回复处理对合金的晶体取向存在一定影响,降低了位错密度,细化了晶粒尺寸(平均晶粒尺寸从7.414μm降到6.809μm),提高了硬度(从199.0 HV提高到212.5 HV)、屈服强度(从481.2 MPa提高到552.4 MPa)、抗拉强度(从528.2 MPa提高到582.0 MPa)。此外,预回复处理明显提高了合金的抗晶间腐蚀性能,但是合金的电导率略有降低,抗剥落腐蚀性能也略微下降。定量分析显示,预回复显著提高了固溶强化和时效沉淀强化的总和,这也是合金强度提高的主要原因。抗剥落腐蚀性能的降低可以归因于合金低角度晶界百分比的降低。
The effects of pre-recovery process on microstructures and properties of 7085 aluminum alloy were studied by X-ray diffraction (XRD), electron backscatter diffraction (EBSD), conductivity, hardness, tensile test, intergranular corrosion test and exfoliation corrosion test. And the impact of performance. The results show that the pre-treatment before solution treatment has some influence on the crystal orientation of the alloy, reducing the dislocation density, refining the grain size (the average grain size decreases from 7.414μm to 6.809μm) and the hardness increases 199.0 HV to 212.5 HV), yield strength (from 481.2 MPa to 552.4 MPa), and tensile strength (from 528.2 MPa to 582.0 MPa). In addition, the pre-recovery treatment significantly improved the intergranular corrosion resistance of the alloy, but the conductivity of the alloy slightly decreased, anti-stripping corrosion properties also declined slightly. Quantitative analysis showed that the pre-recovery significantly increased the sum of solid solution strengthening and aging precipitation strengthening, which is also the main reason for the increase of alloy strength. The reduction of the exfoliation corrosion resistance can be attributed to the reduction of the percentage of low-angle grain boundaries of the alloy.