采用硬度和电导率测试、晶间腐蚀和剥落腐蚀试验、光学金相电镜观察,研究强化固溶处理对含锶钪7085型铝合金（Al-8.34Zn-1.89Mg-1.83Cu-0.15Zr-0.060Sr-0.10Sc）硬度、电导率、晶间腐蚀和剥落腐蚀性能的影响。结果表明,与常规固溶（470℃×2 h）处理相比,强化固溶（470℃×2 h＋480℃×2 h＋490℃×2 h）处理使合金中粗大析出相溶解更为充分,晶粒（亚晶粒）等轴性显著提高。经强化固溶处理加传统T6（121℃×24 h）处理后合金的硬度提高、电导率略有降低,抗晶间腐蚀和剥落腐蚀性能显著提高。
Effect of enhanced-solid-solution treatment on hardness,electrical conductivity,intergranular corrosion and exfoliation corrosion properties of Sr and Sc microalloyed 7085 aluminum alloy(Al-8.34Zn-1.89Mg-1.83Cu-0.15Zr-0.060Sr-0.10Sc) were investigated by means of hardness and electrical conductivity test,intergranular corrosion and exfoliation corrosion test,and optical microscope observation.The results show that compare with the conventional solid-solution treatment(470 ℃×2 h),the enhanced-solid-solution treatment(470 ℃×2 h+480 ℃×2h+490 ℃×2 h) promotes greatly the dissolution of coarse second phase and improves equi-axis degree of grains.After enhanced-solid-solution and conventional T6(121 ℃×24 h) treatment,the alloy exhibites a higher hardness,a slightly lower electrical conductivity,and a considerable improvement of intergranular corrosion resistance and exfoliation corrosion resistance.
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