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以7085铝合金(Al-7.48Zn-1.51Mg-1.42Cu-0.15Zr)为试验对象,通过使用光学显微镜(OM)、电子背散射衍射系统(EBSD)研究了固溶—大变形—时效工艺下7085铝合金的微观组织与抗腐蚀性能的影响。研究表明:相比于常规固溶—时效工艺,固溶—大变形—时效工艺是调控7085铝合金组织与性能的有效手段,它能够显著细化晶粒,增加小角度晶界数量,位错密度上升,同时还可以提高7085铝合金的抗腐蚀性能(晶间腐蚀、剥落腐蚀)。相比于压缩变形加工,等通道转角挤压(ECAP)加工由于可以降低织构和更为有效的细化合金组织,其提高合金性能的能力更强。100℃时效下合金的抗腐蚀性能排序为:固溶—ECAP—时效(晶间腐蚀二级,剥落腐蚀PC)>固溶—压缩变形—时效(三级,EA)>固溶—时效(四级,EB+)。
The effect of solution-deformation-aging process on the microstructure of 7085 aluminum alloy (Al-7.48Zn-1.51Mg-1.42Cu-0.15Zr) was studied by using optical microscope (OM) and electron backscatter diffraction (EBSD) Effect of Microstructure and Corrosion Resistance of 7085 Aluminum Alloy. The results show that compared with the conventional solution-aging process, the solution-deformation-aging process is an effective way to control the microstructure and properties of 7085 aluminum alloy. It can remarkably refine the grains, increase the number of small-angle grain boundaries, dislocations Increased density, but also can improve the corrosion resistance of 7085 aluminum alloy (intergranular corrosion, exfoliation corrosion). Equal Channel Angular Pressing (ECAP) machining offers a greater ability to improve alloy performance due to lower textures and more effective refinement of the alloy compared to compression set. The corrosion resistance of the alloy under the aging of 100 ℃ is ranked as follows: solution-ECAP-aging (intergranular corrosion, exfoliation corrosion)> solution-compression deformation-aging Level, EB +).