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为了获得高锌超高强铝合金均匀化退火适宜工艺,采用光学显微镜、差示扫描量热法、扫描电镜、能谱分析等方法研究二极均匀化退火工艺对高锌Al-Zn-Mg-Cu合金的组织和T6(120℃×24 h)人工时效后的力学性能的影响。结果表明,合金经400℃,4 h均匀化后的过烧温度为471℃;实验合金的最佳二级均匀化退火工艺为随炉升温到400℃保温4 h,再随炉升温到467℃保温30 h;合金经该均匀化工艺处理后,铸锭中的元素偏析明显消除,共晶相明显减少,合金挤压态析出相较小且分布均匀,合金力学性能明显改善。
In order to obtain a suitable process for the homogenization annealing of high-zinc and ultra-high-strength aluminum alloy, the microstructure of the high-zinc Al-Zn-Mg-Cu alloy was investigated by optical microscopy, differential scanning calorimetry, scanning electron microscopy and energy spectrum analysis. Alloy and T6 (120 ℃ × 24 h) after artificial aging mechanical properties. The results show that the overheating temperature of the alloy after homogenization at 400 ℃ for 4 h is 471 ℃. The optimum secondary homogenization annealing process for the alloy is that the temperature of the alloy is kept at 400 ℃ for 4 h and then heated to 467 ℃ After the homogenization process, the segregation of elements in the ingot was obviously eliminated and the eutectic phase obviously decreased. The precipitated phase in the extruded state of the alloy was small and distributed uniformly, and the mechanical properties of the alloy were obviously improved.