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采用电导率、硬度测试、拉伸性能测试、X射线衍射仪显微分析(XRD)、电子背散射衍射检验(EBSD)、晶间与剥落腐蚀试验,研究了不同初始形变储能超高强铝合金Al-11.54Zn-3.51Mg-2.26Cu-0.24Zr-0.0025Sr挤压材在不同升温速率与固溶时间下组织性能的影响。结果表明:慢速升温退火能够降低合金的晶粒尺寸,24 h固溶较2 h固溶能够减少合金难溶第二相。合金硬度值在220.0 HV左右,快速升温合金硬度较慢速升温合金的硬度高。导电率在25.0%IACS左右。慢速升温2 h固溶、24 h固溶时效后合金试样的屈服强度由647.9 MPa变为697.1 MPa,增加了49.2MPa。强度的提升主要来自于固溶强化与时效沉淀析出相强化的总强化,其次为低角度晶界强化。快速升温、慢速升温24 h固溶X方向合金试样的晶间腐蚀深度分别为42.17μm、64.70μm,晶间腐蚀等级为3级,合金的抗剥落腐蚀性能Y方向明显好于X方向,固溶24 h合金抗剥落腐蚀性能较固溶2 h得到了轻微改善。
The conductivity, hardness, tensile properties, X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and intergranular and exfoliation corrosion tests were used to study the effects of different initial deformation energy storage ultra-high strength aluminum alloy Effect of Al-11.54Zn-3.51Mg-2.26Cu-0.24Zr-0.0025Sr Extruded Material on Microstructure and Properties at Different Heating Rates and Solution-Dissolution Time. The results show that slow annealing temperature can decrease the grain size of the alloy, and the solid solution at 24 h can reduce the insoluble second phase of alloy. Alloy hardness value is about 220.0 HV, rapid hardness alloy alloy hardness is higher than the slow hardness. Conductivity is around 25.0% IACS. After slowly heating for 2 h, the yield strength of the alloy sample after 24 h solution aging changed from 647.9 MPa to 697.1 MPa, an increase of 49.2 MPa. The enhancement of strength mainly comes from the total strengthening of solid solution strengthening and aging precipitation precipitation, followed by low angle grain boundary strengthening. The intergranular corrosion depths of the samples in solution and in X direction during rapid heating and slow heating respectively are 42.17μm and 64.70μm, and the intergranular corrosion grade is grade 3. The anti-spalling corrosion resistance of the alloy in Y direction is obviously better than that in X direction, The anti-spalling corrosion resistance of 24 h alloy in solid solution was slightly improved after 2 h solution.