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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,研究了固溶冷变形-预回复对超高强铝合金Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr固溶组织、时效及性能的影响。结果表明,预回复对固溶冷变形态下超高强铝合金的性能改善作用不大。相比固溶—冷压缩—固溶—时效和固溶—冷压缩—预回复—固溶—时效工艺,合金在固溶—冷压缩—时效工艺下具有更优秀的平均晶粒尺寸,硬度、低角度晶界比例、抗拉强度、屈服强度和抗晶间腐蚀性能。其中固溶—冷压缩—时效工艺下合金的屈服、抗拉强度达到了683.2 MPa、734.7 MPa,伸长率为6.1%,且晶间腐蚀深度为23.81μm,晶间腐蚀等级为二级。相比另外两种工艺,该工艺下合金屈服强度的贡献主要是来自位错强化和低角度晶界强化。
X-ray diffraction (XRD), electron backscatter diffraction (EBSD), conductivity test, hardness test, tensile test, intergranular corrosion test and exfoliation corrosion test were used to study the effects of solution- Aluminum alloy Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr solid solution microstructure, aging and performance. The results show that the pre-recovery has little effect on the performance improvement of the ultra-high strength aluminum alloy in solution and cold deformation. Compared with solution-cold compression-solution-aging and solution-cold compression-pre-recovery-solution-aging treatment, the alloy has better average grain size, hardness, Low angle grain boundary ratio, tensile strength, yield strength and intergranular corrosion resistance. The yield strength and tensile strength of the alloys reached 683.2 MPa, 734.7 MPa and 6.1% respectively, and the intergranular corrosion depth was 23.81 μm. The intergranular corrosion grade was second grade. Compared with the other two processes, the contribution of the yield strength of the alloy under this process is mainly from the dislocation strengthening and the low-angle grain boundary strengthening.