固溶-冷变形-时效工艺下超高强铝合金Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr组织及性能研究

The research of solution-cold deformation-aging to ultra-high strength aluminum alloy Al - 13.01Zn - 3.16Mg - 2.8Cu - 0.204Zr - 0.0757Sr affected tissue and properties

摘要:

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，研究了冷变形对超高强铝合金Al - 13.01Zn - 3.16Mg - 2.8Cu - 0.204Zr - 0.0757Sr组织及性能的影响。结果表明，相比传统固溶—时效工艺，合金在固溶—冷压缩—时效工艺下平均晶粒尺寸减小，硬度、电导率、小角度晶界比例、抗拉和屈服强度增大和抗腐蚀性能变好。其中固溶—冷压缩—时效（100 ℃×24 h）工艺下合金的硬度、电导率、屈服、抗拉强度达到了243.0 HV、25.085 %IACS、683.2 MPa和734.7 MPa，延伸率为6.1%，且晶间腐蚀深度为23.81 um，晶间腐蚀等级为二级。

Abstract:

The effects of cold deformation treatment on solution microstructures and properties of a new designed Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr alloy extrusions were investigated by tensile, hardness tests, XRD and EBSD analysis, inter-granular and exfoliation corrosion resistance experiments. The results show that compared to the traditional solution - aging, The average grain size decreases, the hardness, conductivity, low-angle grain boundaries ratio, tensile and yield strength increases, and corrosion resistance becomes better of the alloy under solution-compression-aging. Wherein the hardness, conductivity, yield, tensile strength reached 243.0 HV, 25.085% IACS, 734.7 MPa and 683.2 MPa, elongation of 6.1% and intergranular corrosion depth of 23.81 um, intergranular corrosion rate 2 of the alloy under the solution- compression - aging (100 ℃×24 h).