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℃,4h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4h,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.
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